WO2022025586A1 - Circuit de traitement de signal de détecteur optique - Google Patents

Circuit de traitement de signal de détecteur optique Download PDF

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Publication number
WO2022025586A1
WO2022025586A1 PCT/KR2021/009698 KR2021009698W WO2022025586A1 WO 2022025586 A1 WO2022025586 A1 WO 2022025586A1 KR 2021009698 W KR2021009698 W KR 2021009698W WO 2022025586 A1 WO2022025586 A1 WO 2022025586A1
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Prior art keywords
electrical signal
photodetector
output
light
magnitude
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PCT/KR2021/009698
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English (en)
Korean (ko)
Inventor
구성모
김재건
공성호
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㈜메디센텍
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Priority claimed from KR1020210033853A external-priority patent/KR102499593B1/ko
Application filed by ㈜메디센텍 filed Critical ㈜메디센텍
Publication of WO2022025586A1 publication Critical patent/WO2022025586A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection

Definitions

  • the technology disclosed in this specification generally relates to a photodetector signal processing circuit, and more specifically, a light that determines the absorbance of a light absorbing object provided on an optical path between a light source and a photodetector from an input electrical signal applied to the light source. It relates to a detector signal processing circuit.
  • the optical sensor has superior selectivity and sensitivity compared to the non-optical sensor, and has a semi-permanent lifespan unless the light source and photo detector fail. have.
  • the technology disclosed in this specification is derived to solve the problems of the prior art, and minimizes changes in the parameters of the sensor according to changes in the operating environment of the sensor, such as temperature changes, to thereby minimize the sensor's temperature characteristics, resolution, and dynamic range. It is to provide a technology related to a photodetector signal processing circuit capable of increasing (dynamic range).
  • a technology related to a photodetector signal processing circuit absorbs at least a portion of a first light source capable of emitting light by receiving an applied first input electrical signal, and the light emitted from the first light source and arriving via the first light path.
  • a first photodetector that converts to a first output electrical signal, and comparing the first output electrical signal with a first reference electrical signal to control the output value of the first input electrical signal to control the magnitude of the first output electrical signal includes a control unit.
  • the control unit may include a first feedback circuit unit.
  • the first feedback circuit unit compares the first output electrical signal with the first reference electrical signal and compares the first output electrical signal with the first output electrical signal compared to the magnitude of the first reference electrical signal through the comparison result of the first comparison part. and a first input electrical signal control unit for determining a difference in the magnitude of the signal (hereinafter referred to as a first deviation) and adjusting the output value of the first input electrical signal according to the magnitude of the first deviation.
  • the photodetector signal processing circuit receives the applied second input electrical signal and receives at least a portion of a second light source capable of emitting light, and at least a portion of the light that is emitted from the second light source and arrives via the second light path. It may further include a second photodetector that absorbs and converts the second output electrical signal. In this case, the second output electrical signal may act as the first reference electrical signal. The controller may compare the first output electrical signal with the second output electrical signal to control the output value of the first input electrical signal to control the magnitude of the first output electrical signal.
  • the first photodetector may include, for example, a silicon photomultiplier (SiPM).
  • the second photodetector may include, for example, a silicon photomultiplier (SiPM).
  • the control unit may include a first feedback circuit unit.
  • the first feedback circuit unit compares the first output electrical signal with the second output electrical signal and compares the first output electrical signal with the magnitude of the second output electrical signal through the comparison result of the first comparison unit.
  • a first input electrical signal control unit for determining the difference in the magnitude of the signal (hereinafter referred to as a second deviation) and adjusting the output value of the first input electrical signal according to the magnitude of the second deviation.
  • the first light source and the second light source may emit light having the same characteristics.
  • the first photodetector and the second photodetector may have the same electrical characteristics, and the same operating voltage may be applied to both ends of each of the first photodetector and the second photodetector.
  • the first optical path and the second optical path may have paths that coincide with each other.
  • the controller may control the output value of the first input electrical signal so that the magnitude of the first output electrical signal is equal to the magnitude of the second output electrical signal.
  • the controller may compare the second output electrical signal with a second reference electrical signal to control a bias voltage applied to each of the first photodetector and the second photodetector.
  • the controller may compare the second output electrical signal with the second reference electrical signal to control the bias voltage so that the second output electrical signal has a constant value regardless of a change in temperature.
  • the control unit may include a first feedback circuit unit and a second feedback circuit unit.
  • the first feedback circuit unit compares the first output electrical signal with the second output electrical signal and compares the first output electrical signal with the magnitude of the second output electrical signal through the comparison result of the first comparison unit.
  • the second feedback circuit unit compares the second output electrical signal with the second reference electrical signal and compares the second output electrical signal with the second output electrical signal to the magnitude of the second reference electrical signal through the comparison result of the second comparison part and a bias voltage controller for determining the difference in the magnitude of the signal (hereinafter referred to as a third deviation) and adjusting the bias voltage according to the magnitude of the third deviation.
  • the first light source and the second light source may emit light having the same characteristics.
  • the first photodetector and the second photodetector may have the same electrical characteristics.
  • the first optical path and the second optical path may have paths that coincide with each other.
  • the controller may equally control the magnitude of the operating voltage applied to each of the first photodetector and the second photodetector.
  • the first photodetector may include, for example, a silicon photomultiplier (SiPM).
  • the second photodetector may include, for example, a silicon photomultiplier (SiPM).
  • the controller may control the output value of the first input electrical signal so that the magnitude of the first output electrical signal is equal to the magnitude of the second output electrical signal.
  • the controller may compare the second output electrical signal with the second reference electrical signal to control the bias voltage so that the second output electrical signal has a constant value regardless of a change in temperature.
  • the photodetector signal processing circuit may further include a light absorbing object provided on the first optical path to absorb at least a portion of the light emitted by the first light source.
  • the control unit may measure the absorbance of the light-absorbing object from the magnitude of the first input electrical signal.
  • the technology disclosed in this specification compares the first output electrical signal of the first photodetector by the light provided by the first light source with the first reference electrical signal through the control unit, that is, the first feedback circuit unit, and applies the first light source to the first light source. Even if the absorbance of the light absorbing object provided on the first optical path, which is the path between the first light source and the first photodetector, is changed by controlling the first input electrical signal to be a first input electrical signal to constantly control the first output electrical signal The magnitude of the first output electrical signal may be kept constant.
  • the first photodiode compared to the absorbance or concentration of the light-absorbing object Since the magnitude of the input electrical signal can maintain linearity, it is possible to provide an effect of increasing the accuracy of measuring the absorbance or concentration of the light-absorbing object.
  • the technology disclosed herein may measure the absorbance or the concentration of the light-absorbing object from the magnitude of the first input electrical signal controlled by the controller.
  • the technology disclosed herein introduces a second light source and a second photodetector corresponding to the first light source and the first photodetector, and the first light by the light provided by the first light source through the first feedback circuit unit First input electricity applied to the first light source by comparing the first output electrical signal of the detector with the second output electrical signal of the second photodetector by the light provided by the second light source as the first reference electrical signal By controlling the signal to control the first output electrical signal, and comparing the first input electrical signal with a second input electrical signal applied to the second light source to measure the absorbance or concentration of the light-absorbing object, It is possible to provide an effect of automatically correcting an effect of a change in absorbance or concentration measurement value of a light-absorbing object according to a change in parameters of the first photodetector and the second photodetector.
  • the technique disclosed in this specification compares the second output electrical signal of the second photodetector with the second reference electrical signal through the second feedback circuit unit, and applies a bias voltage to each of the first photodetector and the second photodetector. to maintain the magnitudes of the first output electrical signal of the first photodetector and the second output electrical signal of the second photodetector constant at preset values by controlling the An effect of allowing the photodetector and the second photodetector to maintain a constant gain may be provided.
  • 1 is a view for explaining a process of measuring the concentration of a light-absorbing object of an optical sensor through absorbance analysis.
  • FIG. 2 is a view showing a photodetector signal processing circuit of a general optical sensor.
  • FIG. 3 is a diagram showing an example of a photodetector signal processing circuit disclosed in this specification.
  • FIG. 4 is a diagram showing another example of a photodetector signal processing circuit disclosed in this specification.
  • FIG. 5 is a diagram showing another example of the photodetector signal processing circuit disclosed in this specification.
  • 6 is a picture of a driving board that is actually implemented.
  • FIG. 9 is a view showing an output current, a SiPM bias current, and a bias voltage according to a temperature change of a fixed bias voltage dual optical path signal processing circuit.
  • FIG. 10 is a diagram comparing the output current of a conventional signal processing circuit (Conventional ROIC) and a proposed signal processing circuit (Proposed ROIC) according to the input current of the LED.
  • Conventional ROIC Conventional ROIC
  • Proposed ROIC proposed signal processing circuit
  • FIG. 11 is a diagram showing an output current, a SiPM bias current, and a bias voltage according to a temperature change of a variable bias voltage dual optical path signal processing circuit.
  • FIG. 12 is a diagram comparing SiPM bias voltage according to temperature change of a fixed bias voltage double optical path signal processing circuit (Fixed bias voltage ROIC) and a variable bias voltage double optical path signal processing circuit (Variable bias voltage ROIC).
  • FIG. 13 is a view comparing SiPM bias current according to temperature change of a fixed bias voltage double optical path signal processing circuit (Fixed bias voltage ROIC) and a variable bias voltage double optical path signal processing circuit (Variable bias voltage ROIC).
  • FIG. 14 is a diagram comparing output currents according to temperature change of a fixed bias voltage double optical path signal processing circuit (fixed bias voltage ROIC) and a variable bias voltage double optical path signal processing circuit (Variable bias voltage ROIC).
  • fixed bias voltage ROIC fixed bias voltage double optical path signal processing circuit
  • variable bias voltage double optical path signal processing circuit Variariable bias voltage ROIC
  • 15 is a view showing output current according to the total phosphorus concentration measured by the variable bias voltage double optical path signal processing circuit.
  • the case in which the one component is directly provided to the other component, as well as a case in which an additional component is interposed therebetween, may be included.
  • 1 is a view for explaining a process of measuring the concentration of the light-absorbing object (C) of the optical sensor through absorbance analysis.
  • 2 is a view showing a photodetector signal processing circuit of a general optical sensor.
  • 3 is a diagram showing an example 100 of a photodetector signal processing circuit disclosed herein. 3 shows the first output electrical signal 10b of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 with the first reference electrical signal 10c and In comparison, it is a diagram showing, as an example, a state in which the first output electrical signal 10b is uniformly controlled by controlling the first input electrical signal 10a applied to the first light source 110 .
  • FIG. 4 is a diagram showing another example 100a of the photodetector signal processing circuit disclosed in this specification.
  • FIG. 4 shows that the second light source 140 and the second photodetector 150 are introduced corresponding to the first light source 110 and the first photodetector 120 , and the first light source is passed through the first feedback circuit unit 132 .
  • the first input electrical signal 10a applied to the first light source 110 By controlling the first input electrical signal 10a applied to the first light source 110 by controlling the first input electrical signal 10a applied to the first light source 110 by comparing the signal 20b as the first reference electrical signal 10c, the first output electrical signal 10b is compared.
  • FIG. 5 compares the second output electrical signal 20b of the second photodetector 150 with the second reference electrical signal 30a through the second feedback circuit unit 134 to compare the first photodetector 120 and the second
  • V bias_v applied to each of the photodetectors 150
  • the first output electrical signal 10b of the first photodetector 120 and the second output electrical signal 20b of the second photodetector 150 are controlled.
  • the first photodetector 120 and the second photodetector 150 can maintain a constant gain regardless of temperature change by allowing the size of each to be kept constant at a preset value. It is a drawing that shows
  • Incident Light incident from the light source (A) to the light absorption object (C) is at least partially absorbed by the light absorption object (C) provided on the optical path, and transmitted light passing through the light absorption object (C) Light) reaches the photodetector (B).
  • the absorbance of the light-absorbing object C can be analyzed from the amount of light reaching the photodetector B with respect to the amount of incident light provided by the light source A, and the absorbance of the light-absorbing object C from the analyzed absorbance concentration can be determined.
  • a signal processing circuit for driving a conventional optical sensor for analyzing the absorbance or concentration of the light-absorbing object C is generally composed of a circuit shown as an example in FIG. 2 .
  • an LED is exemplified as a light source A
  • a photo diode is exemplified as a photodetector B.
  • the photodiode as the photodetector (B) is At least a portion of the light emitted by the LED light source A is absorbed and converted into an output current I SS , and the absorbance or concentration of the light-absorbing object C is measured from the size of the converted output current I SS .
  • a semiconductor device such as a photodiode has a problem in that the size of the output current I SS flowing through the photodiode, which is the photodetector B, is sensitive to the temperature change because the characteristic change of the parameter is generally large according to the temperature change.
  • the photodetector signal processing circuit includes a first light source 110 , a first photodetector 120 , and a controller 130 .
  • the photodetector signal processing circuit may optionally further include a second light source 140 , a second photodetector 150 , and a light absorption object C .
  • the first light source 110 may receive the applied first input electrical signal 10a and emit light.
  • An LED may be used as the first light source 110 as an example, but is not limited thereto.
  • the current I out is exemplified as the first input electrical signal 10a provided to the first light source 110 in the drawing, the first input electrical signal 10a provided to the first light source 110 is in the form of a voltage. it may be Hereinafter, for convenience of description, the current I out is used as the first input electrical signal 10a provided to the first light source 110 . It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the first photodetector 120 may absorb at least a portion of the light that is emitted from the first light source 110 and arrives through the first light path and converts it into the first output electrical signal 10b.
  • the first light path refers to a path between the first light source 110 and the first photodetector 120 .
  • a silicon photomultiplier (SiPM) may be used as the first photodetector 120 , but is not limited thereto.
  • the control unit 130 compares the first output electrical signal 10b with the first reference electrical signal 10c to control the output value of the first input electrical signal 10a to control the magnitude of the first output electrical signal 10b.
  • do. 3 illustrates the reference voltages 10c and V ref provided by the voltage setting unit as the first reference electrical signal 10c, but the first reference electrical signal 10c may be in the form of a current. .
  • the reference voltages 10c, V ref will be used as the first reference electrical signal 10c. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the reference voltage (10c, V ref ) provided by the voltage setting unit (Voltage Setting) is provided by directly setting the reference voltage (10c, V ref ) in the voltage setting unit (Voltage Setting), or the voltage setting unit It may be provided through a method of inputting a value (eg, a current value) of the first output electrical signal 10b desired to be set in (Voltage Setting) and converting it into a reference voltage 10c, V ref .
  • the controller 130 may control the magnitude of the first output electrical signal 10b according to the first reference electrical signal 10c.
  • the light absorbing object C may be provided on the first light path to absorb at least a portion of the light emitted by the first light source 110 .
  • the controller 130 may measure the absorbance or concentration of the light-absorbing object C from the magnitude of the first input electrical signal 10a. A process in which the controller 130 measures the absorbance or the concentration of the light-absorbing object C from the magnitude of the first input electrical signal 10a will be described later.
  • control unit 130 may include a first feedback circuit unit 132 .
  • the first feedback circuit unit 132 uses the first comparison result of the first comparison unit 132a and the first comparison unit 132a to compare the first output electrical signal 10b with the first reference electrical signal 10c.
  • the difference in the magnitude of the first output electrical signal 10b compared to the magnitude of the reference electrical signal 10c (hereinafter referred to as a first deviation) is determined, and the first input electrical signal 10a is adjusted according to the magnitude of the first deviation.
  • It may include a first input electrical signal control unit (132b) for adjusting the output value.
  • the first output electrical signal 10b may be in the form of a voltage.
  • the current I SS2 will be used as the first output electrical signal 10b. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the current I SS2 which is the first output electrical signal 10b, is output as a voltage V out by the sensing resistor RS1 and the differential amplifier A v1 to be applied to the first comparator 132a.
  • an error amplifier (Error AMP) for amplifying the difference in voltage input as the first comparator 132a is shown as an example.
  • an error amplifier (Error AMP) for amplifying the difference in current input as the first comparator 132a may be used.
  • an error amplifier (Error AMP) for amplifying a difference in voltage input as the first comparator 132a will be used for description. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the first comparison unit 132a compares the first output electrical signal 10b with the first reference electrical signal 10c and amplifies or attenuates the first deviation as it is or according to a predetermined method to control the first input electrical signal. (132b).
  • the first input electrical signal control unit 132b may control an output value of the first input electrical signal 10a. The above-described process is repeated until the first deviation becomes substantially 0, through which the controller 130 can control the magnitude of the first output electrical signal 10b.
  • the drive amplifier (132b, Drive AMP) as the first input electrical signal control unit (132b) is expressed as an example.
  • the drive amplifier (132b, Drive AMP) is, for example, a first light source by a voltage controlled resistor (VCR, not shown) driven by the voltage provided by the first comparator 132a according to the first deviation. Current may be provided to 110 .
  • VCR voltage controlled resistor
  • the current provided by the first input electrical signal control unit 132b to the first light source 110 is converted into a voltage by the sensing resistor RS2 and the differential amplifier A v2 , and the current It is provided to the sensing unit (Current Sensing), and the current sensing unit (Current Sensing) is the first input electrical signal 10a provided by the first input electrical signal control unit 132b to the first light source 110 from the provided voltage. You can check the current (I out ).
  • the technology disclosed herein converts the first output electrical signal 10b of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 to the first reference electrical signal. After comparison with (10c), the first output electrical signal 10b may be controlled to a desired value by controlling the first input electrical signal 10a applied to the first light source 110 . As an example, the technology disclosed herein transmits the first output electrical signal 10b of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 . After comparison with the reference electrical signal 10c, the first input electrical signal 10a applied to the first light source 110 is controlled to make the first output electrical signal 10b equal to the first reference electrical signal 10c. You can also control it.
  • the incident light (Incident Light) incident from the light source (A) to the light absorption object (C) is at least partially absorbed by the light absorption object (C) provided on the optical path, Transmitted light passing through the light-absorbing object C arrives at the photodetector B.
  • the absorbance or concentration of the light-absorbing object C may be analyzed from the amount of light reaching the photodetector B with respect to the amount of incident light provided by the light source A.
  • the analysis of the absorbance or concentration of the light absorbing object C may be analyzed by comparing the amount of light from the light source A and the amount of light reaching the photodetector B, and the input current ( I ref ) and the amount of light arriving at the photodetector B may be converted by the photodetector B and analyzed by comparing the output current I SS flowing through the photodetector B.
  • the photodetector signal processing circuit of a general optical sensor shown as an example in FIG. 2 includes at least a portion of the light provided by the light source A emitting light by the current I ref provided with a predetermined size from a constant current source. It is configured that the photodetector B receives it and converts it into a photocurrent I SS .
  • a light absorption object (C) for measuring absorbance or concentration is placed on the optical path between the light source (A) and the photodetector (B), and the amount of light provided by the light source (A) and the photodetector (B) are received and converted
  • the absorbance or concentration of the light-absorbing object C is measured by comparing the size of the photocurrent I SS .
  • the amount of light provided by the light source (A) may be determined through the magnitude of the current (I ref ) applied to the light source (A).
  • the photodetector signal processing circuit of a general optical sensor maintains the amount of light provided by the light source (A) and changes according to the change in absorbance or concentration of the light-absorbing object ( C ) located on the optical path. Measure the absorbance or concentration of the light-absorbing object (C).
  • the photodetector (B) When measuring the absorbance or concentration of the light-absorbing object (C) through the photodetector signal processing circuit of a general optical sensor, the photodetector (B) has the maximum concentration of the light-absorbing object (C), that is, even at the maximum absorbance ) must be received, so the amount of light provided by the light source A must be determined in consideration of this. Due to this, the amount of light received from the photodetector B when the light absorbing object C has the minimum concentration, that is, the minimum absorbance, and the photodetector B when the light absorbing object C has the maximum concentration, that is, the maximum absorbance ), the amount of received light has a large deviation.
  • the ratio of the magnitude of the photocurrent (I SS ) converted and output by the photodetector (B) to the amount of received light shows nonlinearity, and the When received, it exhibits a saturation characteristic.
  • the light-absorbing object (C) has the minimum concentration, that is, the minimum absorbance
  • the amount of light received from the photodetector (B) and the light-absorbing object (C) When has the maximum concentration, that is, the maximum absorbance, the amount of light received from the photodetector B has a large deviation.
  • the amount of transmitted light received by the photodetector B by the light source A has a large deviation depending on the change in absorbance or concentration of the light-absorbing object C, and this causes the photodetector B to detect Problems arise in that the dynamic range and resolution are different.
  • the first light path between the first light source 110 and the first photodetector 120 is controlled by the controller 130 .
  • the magnitude of the first input electrical signal 10a may be controlled so that the first output electrical signal 10b has a constant value regardless of a change in absorbance or concentration of the light-absorbing object C positioned on the upper surface.
  • the control unit 130 controls the first output electrical signal through the first feedback circuit unit 132 .
  • the size of (10b) can be controlled.
  • the photodetector signal processing circuit 100 of the present technology may measure the absorbance or the concentration of the light-absorbing object C from the magnitude of the first input electrical signal 10a controlled by the controller 130 .
  • the present technology controls the size of the first input electric signal 10a through the first feedback circuit unit 132 of the control unit 130 to control the absorbance or It is possible to control the first output electrical signal 10b to have a constant value regardless of the change in concentration.
  • the light-absorbing object C is The absorbance or the concentration can be measured.
  • the ratio of the magnitude of the photocurrent (I SS2 ) converted and output by the photodiode mainly used as the first photodetector 120 to the amount of received light has nonlinearity and saturation characteristics, the light absorption target object
  • the magnitude of the first input electrical signal 10a relative to the absorbance or concentration of (C) can maintain linearity, thereby increasing the accuracy of measuring the absorbance or concentration of the light-absorbing object (C).
  • the photodetector signal processing circuit 100a of the present technology illustrated as an example in FIG. 4 may further include a second light source 140 and a second photodetector 150 .
  • the second light source 140 may receive the applied second input electrical signal 20a and emit light.
  • an LED may be used as an example, but is not limited thereto.
  • the current I ref is exemplified as the second input electrical signal 20a provided to the second light source 140 in the drawing, the second input electrical signal 20a provided to the second light source 140 is in the form of a voltage. it may be Hereinafter, for convenience of description, the current I ref will be used as the second input electrical signal 20a provided to the second light source 140 . It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the second photodetector 150 may absorb at least a portion of the light that is emitted from the second light source 140 and arrives through the second light path to convert it into the second output electrical signal 20b.
  • the second light path refers to a path between the second light source 140 and the second light detector 150 .
  • a silicon photomultiplier SiPM
  • the second output electrical signal 20b may act as the first reference electrical signal 10c.
  • the control unit 130 compares the first output electrical signal 10b with the second output electrical signal 20b to control the output value of the first input electrical signal 10a to control the magnitude of the first output electrical signal 10b. can do.
  • the technology disclosed herein compares the first output electrical signal 10b with the second output electrical signal 20b, which is the first reference electrical signal 10c, through the first feedback circuit unit 132, and then By controlling the first input electrical signal 10a applied to the first light source 110 to control the first output electrical signal 10b to be equal to the second output electrical signal 20b which is the first reference electrical signal 10c may be In FIG.
  • the second output electrical signal 20b which is the first reference electrical signal 10c, is emitted from the second light source 140 and then reaches the second photodetector 150 via the second optical path and is absorbed.
  • the current I SS1 flowing through the second photodetector 150 by at least a part of the light from the second light source 140 being the same is expressed as an example.
  • the second output electrical signal 20b may be in the form of a voltage.
  • the current I SS1 will be used as the second output electrical signal 20b. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • control unit 130 may include a first feedback circuit unit 132 .
  • the first feedback circuit unit 132 is configured to compare the first output electrical signal 10b and the second output electrical signal 20b with the first comparison unit 132a and the first comparison unit 132a through the comparison result.
  • the difference in the magnitude of the first output electrical signal 10b compared to the magnitude of the output electrical signal 20b (hereinafter referred to as a second deviation) is determined, and the first input electrical signal 10a is adjusted according to the magnitude of the second deviation.
  • It may include a first input electrical signal control unit (132b) for adjusting the output value.
  • the second output electrical signal 20b may be in the form of a voltage.
  • the current I SS1 will be used as the second output electrical signal 20b. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the current I SS1 as the second output electrical signal 10b is output as a voltage V ref by the sensing resistor R S1 and the differential amplifier A v1 to be applied to the first comparator 132a.
  • a resistor for outputting a current (I SS1 ) as a voltage (V ref ) the same case as the output sensing resistor ( RS1 ) for outputting the current (I SS2 ) as a voltage (V out ) is exemplified, but the current ( I SS1 )
  • the resistor for outputting the voltage (V ref ) may have a different resistance value.
  • the same case as the differential amplifier (A v1 ) for outputting the current (I SS2 ) as the voltage (V out ) as an amplifier for outputting the current (I SS1 ) as the voltage (V ref ) is expressed as an example
  • an amplifier for outputting the current I SS1 as a voltage V ref another amplifier may be used.
  • the figure shows an error amplifier (Error AMP) for amplifying the difference in voltage input as the first comparator 132a as an example.
  • an error amplifier (Error AMP) for amplifying the difference in current input as the first comparator 132a may be used.
  • Error AMP error amplifier
  • the first comparison unit 132a compares the first output electrical signal 10b with the second output electrical signal 20b and amplifies or attenuates the second deviation as it is or according to a predetermined method to control the first input electrical signal. (132b).
  • the first input electrical signal control unit 132b may control an output value of the first input electrical signal 10a. The above-described process is repeated until the second deviation becomes substantially zero, through which the controller 130 can control the magnitude of the first output electrical signal 10b.
  • the drive amplifier (132b, Drive AMP) as the first input electrical signal control unit (132b) is expressed as an example.
  • the drive amplifier (132b, Drive AMP) is, for example, a first light source by a voltage controlled resistor (VCR, not shown) driven by the voltage provided by the first comparator 132a according to the second deviation. Current may be provided to 110 .
  • VCR voltage controlled resistor
  • the current provided by the first input electrical signal control unit 132b to the first light source 110 is converted into a voltage by the sensing resistor RS2 and the differential amplifier A v2 , and the current It is provided to the sensing unit (Current Sensing), and the current sensing unit (Current Sensing) is the first input electrical signal 10a provided by the first input electrical signal control unit 132b to the first light source 110 from the provided voltage. You can check the current (I out ).
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is the first of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 . After comparing the output electrical signal 10b with the second output electrical signal 20b of the second photodetector 150 by the light provided by the second light source 140 as the first reference electrical signal 10c, the first The first output electrical signal 10b may be controlled by controlling the first input electrical signal 10a applied to the light source 110 .
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is a light-absorbing object C from the difference in the magnitude of the first input electrical signal 10a compared to the magnitude of the second input electrical signal 20a.
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 changes the temperature of the first output electrical signal 10b according to the change in the parameter characteristics of the first light source 110 that is changed according to the temperature change. It is possible to automatically correct the change in the magnitude of the first input electrical signal 10a according to the change.
  • the operation of the photodetector signal processing circuit 100a disclosed in the present technology with reference to FIGS. 2 to 4 is the operation of the photodetector signal processing circuit of a general optical sensor and the photodetector signal processing of the present technology shown as an example in FIG. In comparison with the circuit 100, it will be described in detail as follows.
  • the difference between the photodetector signal processing circuit 100 of the present technology shown as an example in FIG. 3 and the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is as follows.
  • the photodetector signal processing circuit 100a of the present technology shown by way of example in FIG. 4 includes a second light source 140 and a second photodetector ( 150) is added, and the second output electrical signal 20b of the second photodetector 150 by the light provided by the second light source 140 is used as the first reference electrical signal 10c.
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is a light-absorbing object C from the difference in the magnitude of the first input electrical signal 10a compared to the magnitude of the second input electrical signal 20a. ) can be measured for absorbance or concentration. Due to these differences, in the photodetector signal processing circuit 100a of the present technology shown as an example in FIG.
  • the first output electrical signal 10b is generated according to the change in the parameter characteristics of the first light source 110 that is changed according to the temperature change. It is possible to additionally provide a differentiated effect capable of automatically correcting a change in the magnitude of the first input electrical signal 10a according to a change in temperature.
  • the photodetector signal processing circuit of a general optical sensor shown as an example in FIG. 2 includes at least a portion of the light provided by the light source A emitting light by the current I ref provided with a predetermined size from a constant current source. It is configured that the photodetector B receives it and converts it into a photocurrent I SS .
  • the photodetector signal processing circuit of a general optical sensor places a light absorption object (C) for measuring absorbance or concentration in the optical path between the light source (A) and the photodetector (B), and the amount of light provided by the light source (A) and The fact that the photodetector B measures the absorbance or concentration of the light-absorbing object C through the comparison of the magnitude of the photocurrent I SS , which is received and converted, is as described above.
  • the photodetector signal processing circuit of a general optical sensor the amount of transmitted light received by the photodetector B by the light source A according to the change in absorbance or concentration of the light-absorbing object C There is a large deviation, which causes a problem in that the dynamic range and resolution that the photodetector B can detect varies.
  • the photodetector signal processing circuit 100 of the present technology shown as an example in FIG. 3 includes the first light source 110 and the first photodetector 120 through the control of the control unit 130 , that is, the first feedback circuit unit 132 .
  • the magnitude of the first input electrical signal 10a is adjusted so that the first output electrical signal 10b has a constant value regardless of the change in absorbance or concentration of the light-absorbing object C located on the first optical path between can be controlled Through this, even if the ratio of the magnitude of the photocurrent (I SS2 ) converted and output by the photodiode mainly used as the first photodetector 120 to the amount of received light has nonlinearity and saturation characteristics, the light absorption target object As described above, the magnitude of the first input electrical signal 10a relative to the absorbance or concentration of (C) can maintain linearity, thereby increasing the accuracy of measuring the absorbance or concentration of the light-absorbing object (C).
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 includes the first output electrical signal 10b and the first reference electrical signal 10c through the control unit 130 , that is, the first feedback circuit unit 132 . ) and control the output value of the first input electrical signal 10a, unlike the photodetector signal processing circuit 100 of the present technology shown as an example in FIG.
  • the first light source through the first feedback circuit unit 132 The first output electric signal 10b of the first photodetector 120 by the light provided by 110 is the first reference electric signal 10c, and the second light by the light provided by the second light source 140 is After comparing with the second output electrical signal 20b of the detector 150, the first input electrical signal 10a applied to the first light source 110 is controlled to control the first output electrical signal 10b to a desired value. can do.
  • the technology disclosed herein compares the first output electrical signal 10b with the second output electrical signal 20b, which is the first reference electrical signal 10c, through the first feedback circuit unit 132, and then By controlling the first input electrical signal 10a applied to the first light source 110 to control the first output electrical signal 10b to be equal to the second output electrical signal 20b which is the first reference electrical signal 10c may be Through this, even if the ratio of the magnitude of the photocurrent (I SS2 ) converted and output by the photodiode mainly used as the first photodetector 120 to the amount of received light has nonlinearity and saturation characteristics, the light absorption target object The magnitude of the first input electrical signal 10a relative to the absorbance or concentration of (C) can maintain linearity, thereby increasing the accuracy of measuring the absorbance or concentration of the light-absorbing object (C).
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is a second photodetector 150 by the light provided by the second light source 140 as the first reference electrical signal 10c.
  • the second output electrical signal 20b of A change in the magnitude of the signal 10a may be automatically corrected.
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is compared to the photodetector signal processing circuit 100 of the present technology shown as an example in FIG.
  • the point that can automatically correct the change in 10a) will be described in detail as an example as follows.
  • the first light source 110 and the first photodetector 120 will be referred to as a measurement stage optical path circuit
  • the second light source 140 and the second photodetector 150 will be referred to as a reference stage optical path circuit.
  • a light absorption object C which is an absorbance or concentration measurement target, may be provided on the first optical path of the measurement stage optical path circuit, and air is provided on the first path of the reference stage optical path circuit.
  • the first photodetector 120 may use, for example, a silicon photoelectric distribution tube (SiPM), and the second photodetector 150 may use, for example, a silicon photoelectric distribution tube (SiPM).
  • SiPM silicon photoelectric distribution tube
  • the first light source 110 and the second light source 140 may emit light having the same characteristics.
  • the first photodetector 120 and the second photodetector 150 may have the same electrical characteristics.
  • the same operating voltage may be applied to both ends of each of the first photodetector 120 and the second photodetector 150 .
  • the first optical path and the second optical path may have paths that coincide with each other.
  • the control unit 130 that is, the first feedback circuit unit 132 controls the output value of the first input electrical signal 10a so that the magnitude of the first output electrical signal 10b is equal to the magnitude of the second output electrical signal 20b.
  • the controller 130 may include a first comparator 132a using the second deviation, which is a difference in magnitude between the first output electric signal 10b and the second output electric signal 20b, as an input value.
  • the first comparator 132a may be, for example, an error amplifier that amplifies a difference between input voltages.
  • the first comparison unit 132a compares the first output electrical signal 10b with the second output electrical signal 20b and amplifies or attenuates the second deviation as it is or according to a predetermined method to control the first input electrical signal. (132b).
  • the first input electrical signal control unit 132b may convert the signal provided by the first comparison unit 132a into a current I out that is the first input electrical signal 10a of the first light source 100 .
  • the first input electrical signal control unit 132b may be, for example, a drive amplifier (Drive AMP).
  • the drive amplifier (132b, Drive AMP) is, for example, controlled by a voltage controlled resistor (VCR, not shown) driven by the differential signal provided by the first comparator 132a according to the second deviation.
  • a current I out may be provided to the first light source 110 .
  • the first photodetector 120 and the second photodetector 150 have the same electrical characteristics, the first light path and the second light path match, and the current I SS1 is output as the voltage V ref .
  • the same resistance as the output sensing resistor ( RS1 ) for outputting the current (I SS2 ) as a voltage ( V out ) as a resistor for Assume that the same amplifier as the differential amplifier (A v1 ) for outputting the current (I SS2 ) as a voltage (V out ) is used.
  • the second The current I SS1 that is the output electrical signal 20b is equal to the current I SS2 that is the first output electrical signal 10b.
  • the current I SS1 which is the second output electrical signal 20b, is generated by the second light source 140 that receives the second input electrical signal 20a and emits light.
  • the first input electrical signal 10a becomes the same as the second input electrical signal 20a of the reference stage optical path circuit.
  • the first input electrical signal of the optical path circuit of the measuring stage regardless of the characteristic change of the first photodetector 120 according to the temperature change.
  • (10a) can be maintained to be the same as the second input electrical signal 20a of the reference stage optical path circuit. That is, the photodetector signal processing circuit 100a of the present technology compares the first output electrical signal 10b and the second output electrical signal 20b through the first feedback circuit unit 132 of the control unit 130 and then the second By controlling the first input electrical signal 10a applied to the first light source 110, the first input electrical signal 10a of the optical path circuit of the measuring stage is controlled regardless of the characteristic change of the first photodetector 120 according to the temperature change.
  • the current (I ref ) applied by the current source (Constant Current Source) as the second input electrical signal (20a) is expressed as an example, the second output electrical signal (20b) current (I SS1 ) may change according to the change in the magnitude of the current (I ref ).
  • the current I SS2 that is the first output electrical signal 10b has the same value as the current I SS1 that is the second output electrical signal 20b, and the current I SS2 that is the first input electrical signal 10a I out ) may remain the same as the current I ref , regardless of a change in the characteristics of the first photodetector 120 according to a change in temperature.
  • the first comparison unit 132a of the first feedback circuit unit 132 determines the second deviation, which is the difference between the size of the second output electrical signal 20b and the magnitude of the first output electrical signal 10b, The second deviation may be amplified and provided to the first input electrical signal control unit 132b.
  • the first input electrical signal control unit 132b may increase the output value of the first input electrical signal 10a to increase the amount of light emitted by the first light source 110 .
  • the above-described process is repeated until the second deviation becomes substantially zero, and through this, the controller 130 controls the first output electrical signal 10b to have the same magnitude as the second output electrical signal 20b.
  • An output value of the first input electrical signal 10a may be controlled.
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 may measure the absorbance or concentration of the light-absorbing object C from the output value of the first input electrical signal 10a. More specifically, the photodetector signal processing circuit 100a of the present technology has the first photodetector 120 according to the temperature change from the magnitude of the second input electrical signal 20a compared to the output value of the first input electrical signal 10a. ), the absorbance or concentration of the light-absorbing object (C) can be measured regardless of the change in characteristics.
  • the photodetector signal processing circuit 100a of the present technology is provided on the first optical path by controlling the magnitude of the first input electrical signal 10a through the first feedback circuit unit 132 of the control unit 130 . It is possible to control the first output electrical signal 10b to have a constant value regardless of a change in absorbance or concentration of the light-absorbing object C to be used.
  • the photodetector signal processing circuit 100a of the present technology utilizes the second output electrical signal 20b whose output is controlled by the second input electrical signal 20b as the first reference electrical signal 10c,
  • the first input electrical signal ( By controlling 10a) from the magnitude of the second input electrical signal 20a compared to the output value of the first input electrical signal 10a, regardless of the change in the characteristics of the first photodetector 120 according to the temperature change, the light absorbing object C can measure the absorbance or concentration of
  • the ratio of the magnitude of the photocurrent (I SS2 ) converted and output by the photodiode mainly used as the first photodetector 120 to the amount of received light has nonlinearity and saturation characteristics, and the photocurrent (I SS2 ) according to the temperature change )
  • the size of the first input electrical signal 10a relative to the absorbance or concentration of the light absorbing object C can maintain linearity through the present technology, and the first photodetector 120 according to the temperature change ) due to the characteristic change can be automatically corrected
  • the second light source 140 can emit the minimum amount of light that can be detected by the second photodetector 150 of the reference stage optical path circuit. If the size of the second input electrical signal 20a is set at a level that exists, high resolution is obtained, and the magnitude of the first input electrical signal 10a of the optical path circuit of the measurement stage is adjusted according to the absorbance or concentration of the light-absorbing object C. By using up to the maximum driving current region of the first light source 110, the dynamic region is enlarged or compared to the photodetector signal processing circuit of the general optical sensor of FIG.
  • the control unit 130 of the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 compares the second output electrical signal 20b with the second reference electrical signal 30a to obtain the first photodetector A bias voltage applied to each of 120 and the second photodetector 150 may be controlled.
  • the control unit 130 compares the second output electrical signal 20b with the second reference electrical signal 30a to control the bias voltage so that the second output electrical signal 20b has a constant value regardless of the temperature change.
  • can 5 illustrates the reference voltage 30a, V set provided by the voltage setting unit as the second reference electrical signal 30a, but the second reference electrical signal 30a may be in the form of a current. .
  • reference voltages 30a, V set are used as the second reference electrical signal 30a. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the reference voltage 30a, V set provided by the voltage setting unit (Voltage Setting) is provided by directly setting the reference voltage (10c, V ref ) to the voltage setting unit (Voltage Setting), or the voltage setting unit In (Voltage Setting), input the value (eg, current value) of the first output electrical signal 10b and the value (eg, current value) of the second output electrical signal 20b, which you want to set, and set it to the reference voltage ( 30a, V set ) may be provided through a method of conversion.
  • the reference voltage 30a, V set controls the operating voltage applied to each of the first photodetector 120 and the second photodetector 150 .
  • the second feedback circuit unit 134 provides the gain of each of the first photodetector 120 and the second photodetector 150 or the first output electrical signal 10b and the second output electrical signal 20b regardless of the temperature change. ) can be kept constant.
  • the controller 130 may control the bias voltage according to the second reference electrical signal 30a.
  • the photodetector signal processing circuit 100b of the present technology controls the first photodetector 120 and the first photodetector 120 through the bias voltage control through the control of the second reference electrical signal 30a by the controller 130 .
  • the first output electrical signal 10b and the second output electrical signal 20b have constant values even when the temperature changes, or the first photodetector ( 120) and the photodetector gain of the second photodetector 150 may have a constant value.
  • control unit 130 of the photodetector signal processing circuit 100b of the present technology may include a first feedback circuit unit 132 and a second feedback circuit unit 134 .
  • the first feedback circuit unit 132 includes a first comparison unit 132a that compares the first output electrical signal 10b with the second output electrical signal 20b acting as the first reference electrical signal 10c of FIG. 3 and Through the comparison result of the first comparator 132a, the difference between the magnitude of the first output electrical signal 10b compared to the magnitude of the second output electrical signal 20b (hereinafter referred to as the second deviation) is determined, and the second deviation It may include a first input electric signal control unit 132b for adjusting the output value of the first input electric signal 10a according to the size of.
  • the second feedback circuit unit 134 compares the second output electrical signal 20b with the second reference electrical signal 30a through the comparison result of the second comparison unit 134a and the second comparison unit 134a.
  • a bias voltage controller ( 134b).
  • the second output electrical signal 20b is emitted from the second light source 140 and then reaches the second photodetector 150 via the second light path.
  • the current I SS1 flowing through the second photodetector 150 by at least a portion of the absorbed second light source 140 is expressed as an example.
  • the second output electrical signal 20b may be in the form of a voltage.
  • the current I SS1 will be used as the second output electrical signal 20b. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the current I SS1 as the second output electrical signal 20b is output as a voltage V ref by the sensing resistor R S1 and the differential amplifier A v1 to be applied to the first comparator 132a.
  • a resistor for outputting a current (I SS1 ) as a voltage (V ref ) the same case as the output sensing resistor ( RS1 ) for outputting the current (I SS2 ) as a voltage (V out ) is exemplified, but the current ( I SS1 )
  • the resistor for outputting the voltage (V ref ) may have a different resistance value.
  • the same case as the differential amplifier (A v1 ) for outputting the current (I SS2 ) as the voltage (V out ) as an amplifier for outputting the current (I SS1 ) as the voltage (V ref ) is expressed as an example
  • an amplifier for outputting the current I SS1 as a voltage V ref another amplifier may be used.
  • the figure shows an error amplifier (Error AMP) for amplifying the difference in voltage input as the first comparator 132a as an example.
  • an error amplifier (Error AMP) for amplifying the difference in current input as the first comparator 132a may be used.
  • Error AMP error amplifier
  • the first comparison unit 132a compares the first output electrical signal 10b with the second output electrical signal 20b and amplifies or attenuates the second deviation as it is or according to a predetermined method to control the first input electrical signal. (132b).
  • the first input electrical signal control unit 132b may control an output value of the first input electrical signal 10a. The above-described process is repeated until the second deviation becomes substantially zero, through which the controller 130 can control the magnitude of the first output electrical signal 10b.
  • the drive amplifier (132b, Drive AMP) as the first input electrical signal control unit (132b) is expressed as an example.
  • the drive amplifier (132b, Drive AMP) is, for example, a first light source by a voltage controlled resistor (VCR, not shown) driven by the voltage provided by the first comparator 132a according to the second deviation. Current may be provided to 110 .
  • VCR voltage controlled resistor
  • the current provided by the first input electrical signal control unit 132b to the first light source 110 is converted into a voltage by the sensing resistor RS2 and the differential amplifier A v2 , and the current It is provided to the sensing unit (Current Sensing), and the current sensing unit (Current Sensing) is the first input electrical signal 10a provided by the first input electrical signal control unit 132b to the first light source 110 from the provided voltage. You can check the current (I out ).
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is the first of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 . After comparing the output electrical signal 10b with the second output electrical signal 20b of the second photodetector 150 by the light provided by the second light source 140 as the first reference electrical signal 10c, the first The first output electrical signal 10b may be controlled by controlling the first input electrical signal 10a applied to the light source 110 .
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is a light-absorbing object C from the difference in the magnitude of the first input electrical signal 10a compared to the magnitude of the second input electrical signal 20a.
  • the detailed operation of the first feedback circuit unit 132 has been previously described in detail in the description of the operation of the photodetector signal processing circuit 100a of the present technology in relation to FIG. 4 , and a detailed description thereof will be omitted for convenience of description.
  • the second feedback circuit unit 134 in relation to the second feedback circuit unit 134, in FIG. 5, it is emitted from the second light source 140 as a second output electrical signal 20b and then reaches the second photodetector 150 via the second optical path.
  • the current I SS1 flowing through the second photodetector 150 by at least a portion of the absorbed second light source 140 is expressed as an example.
  • the second output electrical signal 20b may be in the form of a voltage.
  • the current I SS1 will be used as the second output electrical signal 20b. It is clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the current I SS1 that is the second output electrical signal 20b may be output as a voltage V ref by the sensing resistor RS1 and the differential amplifier A v1 and applied to the second comparator 134a.
  • an error amplifier (Error AMP) amplifying the difference in voltage input as the second comparator 134a is shown as an example. Unlike the drawing, an error amplifier (Error AMP) for amplifying the difference in current input as the second comparator 134a may be used.
  • an error amplifier (Error AMP) for amplifying a difference in voltage input as the second comparator 134a will be used for description. It should be clearly stated that this description is not intended to limit the scope of the technology disclosed herein.
  • the second comparator 134a compares the second output electrical signal 20b with the second reference electrical signal 30a and amplifies or attenuates the third deviation as it is or according to a predetermined method to thereby control the bias voltage control unit 134b.
  • the bias voltage controller 134b may adjust the bias voltage V bias_v
  • the second output electrical signal 20b may be adjusted according to the bias voltage V bias_v adjustment of the bias voltage controller 134b.
  • the above-described process is repeated until the third deviation becomes substantially 0, through which the controller 130, that is, the second feedback circuit unit 134 can control the magnitude of the second output electrical signal 20b. .
  • the magnitude of the first output electrical signal 10b may also be controlled through the second feedback circuit unit 134 .
  • the first output electrical signal 10b may be adjusted as the size of the first output electrical signal 10b is adjusted by the above-described first feedback circuit unit 132 .
  • the technology disclosed herein compares the first output electrical signal 10b with the second output electrical signal 20b, which is the first reference electrical signal 10c, through the first feedback circuit unit 132, and then By controlling the first input electrical signal 10a applied to the first light source 110 to control the first output electrical signal 10b to be equal to the second output electrical signal 20b which is the first reference electrical signal 10c may be
  • the reference voltages 30a , V set which are the second reference electrical signals 30a , control the operating voltages applied to each of the first photodetector 120 and the second photodetector 150 .
  • the second feedback circuit unit 134 provides the gain of each of the first photodetector 120 and the second photodetector 150 or the first output electrical signal 10b and the second output electrical signal 20b regardless of the temperature change. ) can be kept constant.
  • the drive amplifiers 134b and Drive AMP are shown as the bias voltage control unit 134b as an example.
  • the drive amplifier (134b, Drive AMP) is, for example, a second light by a voltage controlled resistor (VCR, not shown) driven by the voltage provided by the second comparator 134a according to the third deviation.
  • a bias voltage V bias_v may be provided to the detector 150 and the first photodetector 120 .
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is the first of the first photodetector 120 by the light provided by the first light source 110 through the first feedback circuit unit 132 .
  • the first The first output electrical signal 10b may be controlled by controlling the first input electrical signal 10a applied to the light source 110 .
  • the first output electrical signal 10b is compared with the second output electrical signal 20b which is the first reference electrical signal 10c through the first feedback circuit unit 132 and then applied to the first light source 110 .
  • the first output electrical signal 10b may be controlled to be equal to the second output electrical signal 20b which is the first reference electrical signal 10c by controlling the first input electrical signal 10a. Through this, it is possible to automatically correct the change of the first output electrical signal 10b according to the temperature change.
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is the first through the bias voltage control through the control of the second reference electrical signal 30a by the second feedback circuit unit 134.
  • the first output electrical signal 10b and the second output electrical signal 20b have constant values even when the temperature changes.
  • the photodetector gains of the first photodetector 120 and the second photodetector 150 may have a constant value.
  • the difference between the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 and the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is as follows.
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is a technical feature in which a second feedback circuit unit 134 is added to the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 .
  • the photodetector signal processing circuit 100b of the present technology generates the first output electrical signal 10b according to the change in the parameter characteristics of the first light source 110 that is changed according to the temperature change, which is the effect of the first feedback circuit unit 132 .
  • the photodetector signal processing circuit 100b of the present technology is applied to each of the first photodetector 120 and the second photodetector 150 through the bias voltage control that is the effect of the second feedback circuit unit 134 .
  • the first output electrical signal 10b and the second output electrical signal 20b have constant values even when the temperature changes, or the first photodetector 120 and the second photodetector 150 are It is possible to provide an effect of allowing the photodetection gain to have a constant value.
  • FIG. 4 the operation of the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 with the second feedback circuit unit 134 as an example is shown in FIG. 4 as an example of the photodetector signal processing circuit 100a of the present technology and will be described in detail.
  • the first light source 110 and the first photodetector 120 will be referred to as a measurement stage optical path circuit
  • the second light source 140 and the second photodetector 150 will be referred to as a reference stage optical path circuit.
  • a light absorption object C which is an absorbance or concentration measurement target, may be provided on the first optical path of the measurement stage optical path circuit, and air is provided on the first path of the reference stage optical path circuit.
  • the first light source 110 and the second light source 140 may emit light having the same characteristics.
  • the first photodetector 120 and the second photodetector 150 may have the same electrical characteristics.
  • the same operating voltage may be applied to both ends of each of the first photodetector 120 and the second photodetector 150 by a bias voltage.
  • the first optical path and the second optical path may have paths that coincide with each other.
  • the control unit 130 of the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5, that is, the second feedback circuit unit 134 controls the bias voltage to control the first photodetector 120 and the second light.
  • the magnitude of the operating voltage applied to each of the detectors 150 may be equally controlled.
  • the second feedback circuit unit 134 may include a second comparator 134a using the third deviation, which is the difference in magnitude between the second output electrical signal 20b and the second reference electrical signal 30a, as an input value.
  • the second comparator 134a may be, for example, an error amplifier that amplifies a difference between input voltages.
  • the second comparator 134a compares the second output electrical signal 20b with the second reference electrical signal 30a and amplifies or attenuates the third deviation as it is or according to a predetermined method to thereby control the bias voltage control unit 134b. can be provided to
  • the bias voltage controller 134b may adjust the bias voltage V bias_v through a signal provided by the second comparator 134a.
  • the bias voltage controller 134b may be, for example, a drive amplifier 134b (Drive AMP).
  • the bias voltage controller 134b for example, is a second photodetector (VCR, not shown) driven by a signal provided by the second comparator 134a according to the third deviation. 150 ) and the first photodetector 120 may be provided with a bias voltage V bias_v .
  • the first photodetector 120 and the second photodetector 150 have the same electrical characteristics, the first light path and the second light path match, and the current I SS1 is output as the voltage V ref .
  • the same resistance as the output sensing resistor ( RS1 ) for outputting the current (I SS2 ) as a voltage ( V out ) as a resistor for Assume that the same amplifier as the differential amplifier (A v1 ) for outputting the current (I SS2 ) as a voltage (V out ) is used.
  • the absorbance of the light-absorbing object C regardless of the change in the characteristics of the first photodetector 120 according to the temperature change from the magnitude of the second input electric signal 20a compared to the output value of the first input electric signal 10a Alternatively, the fact that the concentration can be measured has been described above in the detailed description of the photodetector signal processing circuit 100a of the present technology with reference to FIG. 4 .
  • the second feedback circuit part 134 is additionally configured separately from the first feedback circuit part 132 like the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5, the second feedback circuit part 134
  • the second feedback circuit part 134 By controlling the operating voltage applied to each of the first photodetector 120 and the second photodetector 150 through the bias voltage control through the control of the second reference electrical signal 30a by
  • the output electrical signal 10b and the second output electrical signal 20b may have a constant value, or the photodetection gain of the first photodetector 120 and the second photodetector 150 may have a constant value. have.
  • the second feedback circuit unit 134 compares the second output electrical signal 20b and the second reference electrical signal 30a to the first photodetector 120 and the second photodetector 150 .
  • each applied bias voltage V bias_v
  • the operating voltage can be controlled.
  • a change in the operating voltage applied to both ends of the first photodetector 120 and the second photodetector 150 according to the temperature change causes a change in the first output electric signal 10b and the second output electric signal 20b. can do.
  • the second feedback circuit unit 134 controls the second output electrical signal 20b to have a constant value according to the second reference electrical signal 30a, so that even if the temperature changes, the first output electrical signal 10b and the second output
  • the electrical signal 20b may have a constant value, or the photodetection gains of the first photodetector 120 and the second photodetector 150 may have a constant value.
  • a silicon photoelectric distribution tube (SiPM) may be used as the first photodetector 120
  • a silicon photoelectric distribution tube (SiPM) may be used as the second photodetector 150
  • the controller 130 may control the output value of the first input electrical signal 10a so that the magnitude of the first output electrical signal 10b is equal to the magnitude of the second output electrical signal 20b.
  • the control unit 130 compares the second output electrical signal 20b with the second reference electrical signal 30a and controls the bias voltage so that the second output electrical signal 20b has a constant value regardless of the temperature change. can do.
  • a silicon photodistribution tube (SiPM) used as the first photodetector 120 and a silicon photodistribution tube (SiPM) used as the second photodetector 150 may each be a silicon photodistribution tube (SiPM) operating in a Geiger mode.
  • the bias voltage V bias_v applied to the silicon photovoltaic tube (SiPM) may be expressed as a sum of a breakdown voltage and an overvoltage.
  • the breakdown voltage refers to a bias point that generates an electric field high enough in a depletion region to generate a Geiger mode.
  • the overvoltage means a difference between the bias voltage V bias_v and the breakdown voltage.
  • the gain of a silicon photovoltaic tube (SiPM) is defined as the amount of charge generated by photons, and has a characteristic proportional to the overvoltage.
  • the breakdown voltage of a silicon photovoltaic tube (SiPM) changes with temperature change as a function of temperature and has a change characteristic close to linearity.
  • the overvoltage of the silicon photovoltaic tube (SiPM) also changes according to the temperature change according to the change in the breakdown voltage of the silicon photoelectric distribution tube (SiPM) according to the temperature change. Accordingly, when a fixed bias voltage V bias_v is applied, the overvoltage of the silicon photovoltaic tube (SiPM) decreases as the breakdown voltage of the silicon photoelectric distribution tube (SiPM) increases as the temperature increases.
  • the reduction of the overvoltage of the silicon photovoltaic tube (SiPM) causes the gain of the silicon photovoltaic tube (SiPM) to decrease, and consequently the bias current I SS1 and the current I SS2 flowing through the silicon photovoltaic tube (SiPM). ) will decrease.
  • a change in the gain of the silicon photovoltaic tube (SiPM) according to a change in temperature may result in an increase in measurement error.
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 compares the second output electrical signal 20b with the second reference electrical signal 30a through the second feedback circuit unit 134 to change the temperature.
  • the bias voltage may be controlled so that the second output electrical signal 20b has a constant value regardless of the . Since the bias voltage V bias_v is also applied to the first photodetector 120 , the magnitude of the first output electrical signal 10b may also be controlled through the second feedback circuit unit 134 .
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 includes the second output electrical signal 20b and the second reference electrical signal 30a through the second feedback circuit unit 134 .
  • the control unit 130 that is, the second feedback circuit unit 134 controls the first photodetector 120 and the second photodetector 150.
  • the overvoltage applied to each may be kept constant regardless of temperature change. That is, the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is the first photodetector 120 and the second photodetector 150 respectively through the second feedback circuit unit 134, the gain or the second The first output electrical signal 10b and the second output electrical signal 20b may be constantly maintained.
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is compared to the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. It is possible to provide an effect that can further reduce the error in measuring the concentration.
  • SiPM having the same characteristics as the first light source 110 and the second light source 140 , the first photodetector 120 and the second photodetector 150 having the same characteristics was used as an example. , even if the characteristics of the first light source 110 and the second light source 140 are not the same, and the characteristics of the first photodetector 120 and the second photodetector 150 are not the same, the technical characteristics provided by the present technology It will be apparent that the above-described effects obtained by the above can be applied as well.
  • the technology disclosed in this specification compares the first output electrical signal of the first photodetector by the light provided by the first light source with the first reference electrical signal through the control unit, that is, the first feedback circuit unit.
  • the first photodiode compared to the absorbance or concentration of the light-absorbing object Since the magnitude of the input electrical signal can maintain linearity, it is possible to provide an effect of increasing the accuracy of measuring the absorbance or concentration of the light-absorbing object.
  • the technology disclosed herein may measure the absorbance or the concentration of the light-absorbing object from the magnitude of the first input electrical signal controlled by the controller.
  • the technology disclosed herein introduces a second light source and a second photodetector corresponding to the first light source and the first photodetector, and the first light by the light provided by the first light source through the first feedback circuit unit First input electricity applied to the first light source by comparing the first output electrical signal of the detector with the second output electrical signal of the second photodetector by the light provided by the second light source as the first reference electrical signal By controlling the signal to control the first output electrical signal, and comparing the first input electrical signal with a second input electrical signal applied to the second light source to measure the absorbance or concentration of the light-absorbing object, It is possible to provide an effect of automatically correcting an effect of a change in absorbance or concentration measurement value of a light-absorbing object according to a change in parameters of the first photodetector and the second photodetector.
  • the technique disclosed herein compares the second output electrical signal of the second photodetector with the second reference electrical signal through the second feedback circuit unit to apply an operating voltage to each of the first photodetector and the second photodetector irrespective of temperature change by controlling the bias voltage of An effect of allowing the first photodetector and the second photodetector to maintain a constant gain may be provided.
  • 6 is a picture of a driving board that is actually implemented.
  • 7 is a photograph of the temperature and humidity test equipment.
  • 8 is a photograph showing samples that were colored blue according to the total phosphorus concentration (from the left 1mg/1000ml, 2mg/1000ml, 3mg/1000ml, 4mg/1000ml, 5mg/1000ml).
  • 9 is a view showing an output current, a SiPM bias current, and a bias voltage according to a temperature change of a fixed bias voltage dual optical path signal processing circuit.
  • 10 is a diagram comparing the output current of a conventional signal processing circuit (Conventional ROIC) and a proposed signal processing circuit (Proposed ROIC) according to the input current of the LED.
  • 11 is a diagram showing an output current, a SiPM bias current, and a bias voltage according to a temperature change of a variable bias voltage dual optical path signal processing circuit.
  • 12 is a diagram comparing SiPM bias voltage according to temperature change of a fixed bias voltage double optical path signal processing circuit (Fixed bias voltage ROIC) and a variable bias voltage double optical path signal processing circuit (Variable bias voltage ROIC).
  • 13 is a view comparing SiPM bias current according to temperature change of a fixed bias voltage double optical path signal processing circuit (Fixed bias voltage ROIC) and a variable bias voltage double optical path signal processing circuit (Variable bias voltage ROIC).
  • variable bias voltage ROIC variable bias voltage double optical path signal processing circuit
  • 15 is a view showing output current according to the total phosphorus concentration measured by the variable bias voltage double optical path signal processing circuit.
  • the manufactured board consists of a total of 4 boards, including an LED light source driving board, a Lab-on-a-Chip (LOC) driving board, and a main board that controls, measures, and outputs three boards connected to the SiPM driving board.
  • LOC Lab-on-a-Chip
  • main board that controls, measures, and outputs three boards connected to the SiPM driving board.
  • a right-angled container for separating air and samples and an interference blocking mechanism for reducing mutual interference between LED light sources were manufactured with a 3D printer.
  • FIG. 6A is a photograph of a signal processing circuit (ROIC) driving board prepared for test for characteristic evaluation.
  • Figure 6 (b) shows each implemented board. Counterclockwise from the upper left are the SiPM driving board, main board, LED driving board, and lab-on-a-chip driving board.
  • ROIC signal processing circuit
  • the performance of the proposed signal processing circuit was evaluated according to the temperature change.
  • the temperature and humidity testers were the H1500 (KOLAS) of the Avionics Test and Evaluation Center located in Yeongcheon-si, Gyeongsangbuk-do and the SH-100 model (Samheung Machinery Corporation) of the Nano Convergence Practicalization Center in Dalseo-gu, Daegu. ) was used.
  • the signal processing circuit used in the experiment was tested by modifying the same driving board in two ways, in the state of the board without any device coupling. Change the temperature in the range of -10 to 50°C in an air medium without a sample so that the concentration of the sample at the measuring stage is the same as that of the reference stage by 5°C and maintain it for 20 minutes in each temperature section, then the LED output current of the measuring stage, The bias current and bias voltage of SiPM were measured.
  • the LED input current of the reference stage used for measurement was set to 1mA, and the bias current of the two SiPMs was set to be about 0.3mA at room temperature (25°C).
  • the state for measurement using the SH-100 temperature and humidity test equipment is shown in FIG. 7 .
  • Colorimetric is a method of qualitatively and quantifying the concentration of a solution by measuring the absorbance of a specific wavelength of light using a color reagent. Also called colorimetric analysis, it is used for both organic and inorganic compounds.
  • concentration of a solution is measured using the Beer-Lambert law, which states that the absorption of light by a solution depends on the concentration and the thickness of the sample.
  • the colorimetric method-based optical sensor is used in the Total-Phosphorus analysis method, which is one of the water pollution analysis methods.
  • the total phosphorus analysis method is an indicator of the degree of eutrophication of the aquatic ecosystem and means the total amount of phosphorus contained in the aquatic ecosystem. Phosphorus exists in the form of a compound by combining with various substances in the aquatic ecosystem.
  • Phosphorus phosphate decomposed through the pretreatment process is colored blue by the color developer (molybdenum-ascorbic acid mixture), and the concentration of total phosphorus contained in the sample is quantitatively measured by using a colorimetric method that measures the absorbance of the sample.
  • the color developer mobdenum-ascorbic acid mixture
  • the preparation method of the reagent required for total phosphorus analysis is as follows.
  • Potassium persulfate solution (4W/V %): Dissolve 4 g of potassium persulfate (K2S2O8) in 100 mL of water.
  • Ammonium molybdate-ascorbic acid mixture Dissolve 6 g of ammonium molybdate (Ammonium Molybdate (VI), (NH4Mo7O24 ⁇ 4H2O)) and 0.24 g of antimony potassium tartrate in 300 mL of water, add 120 mL of sulfuric acid and 5 g of ammonium sulfamate to dissolve to make 500mL, add 100mL of 7.2% L-Ascorbic Acid (C6H8O6) solution and mix. It must be prepared immediately before use.
  • Phosphate standard stock solution 1000 mg PO4-P/L: Precisely weigh 0.439 g of potassium dihydrogen phosphate (Potassium Phosphate, Monobasic; KH2PO4; standard reagent) dried at 105°C and dissolve in water to make exactly 1000 mL.
  • potassium dihydrogen phosphate Potassium Phosphate, Monobasic; KH2PO4; standard reagent
  • the photodetector signal processing circuit 100a of the present technology shown as an example in FIG. 4 is referred to as a fixed bias voltage double optical path signal processing circuit
  • the photodetector signal processing circuit 100b of the present technology shown as an example in FIG. 5 is referred to as a variable bias voltage double optical path signal processing circuit.
  • An LED was used as the first light source 110 and the second light source 140
  • SiPM was used as the first photodetector 120 and the second photodetector 150 .
  • a temperature test was performed by adjusting the bias voltage (26.82 V) so that the bias current of SiPM was about 0.3mA at room temperature (25°C).
  • 9 shows changes in the LED output current (I out ), the bias current (I ss1 ) of the SiPM, and the bias voltage (V bias ) according to the temperature change. It shows that the bias voltage is stably maintained within ⁇ 0.2% (26.87 ⁇ 26.80V) of the set voltage (26.82V) at room temperature, but the slight deviation is considered to be due to the temperature characteristics of the constant voltage circuit.
  • Bias current showed a characteristic that decreased with increasing temperature with a change from 0.970mA@-10°C to 0.011mA@50°C based on the set current (0.313mA) at room temperature. This shows well the change in the characteristics of the gain according to the temperature change of the SiPM at a fixed bias voltage.
  • the output current (I out ) was changed from 0.739mA@-10 °C to 1.170 mA@50°C based on the measured current (1.023mA) at room temperature, showing a maximum deviation of 28%.
  • the change in the LED output current of the measuring stage according to the change in the LED input current of the reference stage was measured in an air medium without a sample.
  • the temperature for measurement was set at 25°C, and the bias voltage of the two SiPMs was fixed at 30V, respectively.
  • the input current of the reference stage was measured while increasing from 2mA to 20mA in 2mA increments.
  • the characteristic of the LED output current of the measuring stage with respect to the LED input current of the reference stage maintained linearity in the entire area as shown by the dotted line in FIG. 10 .
  • the change in the SiPM output current according to the change in the LED input current was measured in the air medium.
  • the temperature for the measurement was set at 25°C, and the bias voltage of the SiPM was fixed at 30V.
  • the input current of the LED was measured while increasing from 2mA to 20mA in 2mA increments. As shown by the solid line in FIG. 10 , when the input current of the LED increases (the concentration of the sample decreases), the change rate of the output current of the SiPM decreases, which indicates that the resolution is lowered in the region where the concentration of the sample is low. That is, in order to increase the concentration of the measurement sample to a high region, the input current of the LED must be increased, which reduces the resolution of the sample at a low concentration.
  • variable bias voltage double optical path signal processing circuit The evaluation of the variable bias voltage double optical path signal processing circuit was conducted as follows.
  • the bias current of SiPM was set to be about 0.3mA at room temperature (25°C).
  • the LED output current (I out_v ), the bias current (I ss1_v ) and the bias voltage (V bias_v ) of the SiPM measured according to the temperature change are displayed.
  • the bias voltage is 23.123 ⁇ 30.510V based on the measured voltage (26.676V) at room temperature, which shows that it varies according to the temperature change. It shows that the bias current is maintained within 0.6% (max. 0.319mA) based on the set current (0.313mA) at room temperature.
  • the output current showed deviation characteristics within +7 % (up to 1.053 mA) based on the measured current (0.981 mA) at room temperature.
  • the comparative analysis and evaluation of the colorimetric method-based optical sensor signal processing circuit are as follows.
  • the temperature characteristics of the two proposed dual optical path signal processing circuits were compared and analyzed by dividing them into output current, SiPM bias current and bias voltage.
  • the blue solid line is the characteristic curve of the double optical path signal processing circuit of the fixed bias voltage method and the gray solid line is the variable bias voltage method.
  • the bias voltage is kept constant as the applied voltage regardless of the temperature change.
  • the bias current of the SiPM is changed according to the temperature change by the variable bias voltage control circuit to keep it constant.
  • the output current changes by up to 28% from 0.739 to 1.170 mA based on the measured current at room temperature (1.023 mA).
  • the output current is based on the measured current at room temperature (0.981 mA). Within about +7% (up to 1.053mA), it exhibited excellent deviation characteristics lower than that of the fixed bias voltage method.
  • variable bias voltage dual optical path signal processing circuit keeps the gain and bias current of SiPM that change according to the temperature change constant, thereby minimizing and fixing the characteristic change of the two SiPM parameters that change according to the temperature change.
  • the bias voltage double optical path signal processing circuit showed superior temperature characteristics.
  • the driving results of the colorimetric method-based optical sensor using the proposed signal processing circuit are as follows.
  • the output current test according to the sample concentration change at the measuring stage was conducted at room temperature (25°C).
  • the bias current of SiPM for measurement was set to 0.3mA
  • the LED input current of the reference stage was set to 1mA.
  • the colorimetric mixing volume for each total phosphorus concentration of 1mg/1000ml ⁇ 5mg/1000ml used for the measurement was 13ml each, and was measured by putting it in a measuring container of a rectangular parallelepiped.
  • the output current showed a change of 5.968 to 59.95 mA with respect to the sample concentration of 1 to 5 mg/1000ml, and the results are shown in FIG. 15 as a log scale and a linear scale. indicated.
  • the input/output characteristics of the proposed circuit show linear characteristics on a log scale, which shows that the output characteristics according to the change in total phosphorus concentration follow Beer-Lambert's law well, and the resolution and linearity of the proposed signal processing circuit are excellent. .
  • a signal processing circuit that can be applied to the performance improvement of a colorimetric-based optical sensor, which is the most common method among measurement methods of an optical sensor, is proposed.
  • a dual optical path (DOP) method applied with a variable bias voltage control circuit is implemented to improve the temperature characteristics of the sensor. Resolution and dynamic range were increased.
  • a dual optical path sensor structure using two silicon photomultiplier (SiPM) is applied, so that the bias current of the two SiPMs is maintained as an example, feedback control of the current of the LED light source
  • SiPM silicon photomultiplier
  • variable bias voltage dual optical path signal processing circuit maintains the gain and bias current of the SiPM that change according to the temperature change to keep the characteristics of the two SiPM parameters that change according to the temperature change.
  • a technology with better measurement error was implemented, and it was applied to the Total-Phosphorus and Total-Nitrogen analysis methods, which are one of the representative colorimetric-based analysis methods. As a result of the experiment, it was confirmed that the resolution and linearity were excellent.

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Abstract

Est divulguée une technologie associée à un circuit de traitement de signal de détecteur optique. Le circuit de traitement de signal de détecteur optique comprend : une première source de lumière pouvant émettre de la lumière par la réception d'un premier signal d'électricité d'entrée appliqué ; un premier détecteur optique absorbant au moins une partie de la lumière émise par la première source de lumière, puis arrivant par un premier trajet optique, ce qui permet de la convertir en un premier signal d'électricité de sortie ; et une unité de commande, qui compare le premier signal d'électricité de sortie à un premier signal d'électricité de référence afin de commander la valeur de sortie du premier signal d'électricité d'entrée, et commande ainsi l'amplitude du premier signal d'électricité de sortie.
PCT/KR2021/009698 2020-07-28 2021-07-27 Circuit de traitement de signal de détecteur optique WO2022025586A1 (fr)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
US20110019193A1 (en) * 2008-10-29 2011-01-27 Minoru Danno Method and apparatus for measuring density
KR20130042464A (ko) * 2010-02-16 2013-04-26 하마마츠 포토닉스 가부시키가이샤 가스 농도 산출 장치, 가스 농도 계측 모듈 및 광 검출기
KR20150018713A (ko) * 2013-08-09 2015-02-24 재단법인 포항산업과학연구원 원자 흡광법을 이용한 원소 농도 분석 장치 및 방법
KR20160018127A (ko) * 2014-08-08 2016-02-17 (주) 테크로스 흡광광도법을 이용한 농도 측정 장치 및 방법
KR20170121351A (ko) * 2016-04-22 2017-11-02 (주) 테크로스 흡광광도법을 이용한 농도 측정 장치 및 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110019193A1 (en) * 2008-10-29 2011-01-27 Minoru Danno Method and apparatus for measuring density
KR20130042464A (ko) * 2010-02-16 2013-04-26 하마마츠 포토닉스 가부시키가이샤 가스 농도 산출 장치, 가스 농도 계측 모듈 및 광 검출기
KR20150018713A (ko) * 2013-08-09 2015-02-24 재단법인 포항산업과학연구원 원자 흡광법을 이용한 원소 농도 분석 장치 및 방법
KR20160018127A (ko) * 2014-08-08 2016-02-17 (주) 테크로스 흡광광도법을 이용한 농도 측정 장치 및 방법
KR20170121351A (ko) * 2016-04-22 2017-11-02 (주) 테크로스 흡광광도법을 이용한 농도 측정 장치 및 방법

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