CN109060678A - A kind of absorbance measuring circuit - Google Patents
A kind of absorbance measuring circuit Download PDFInfo
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- CN109060678A CN109060678A CN201810981499.7A CN201810981499A CN109060678A CN 109060678 A CN109060678 A CN 109060678A CN 201810981499 A CN201810981499 A CN 201810981499A CN 109060678 A CN109060678 A CN 109060678A
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- 238000002835 absorbance Methods 0.000 title claims abstract description 45
- 239000000126 substance Substances 0.000 claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 104
- 230000000087 stabilizing effect Effects 0.000 claims description 42
- 230000005611 electricity Effects 0.000 claims description 16
- 230000006641 stabilisation Effects 0.000 claims description 9
- 238000011105 stabilization Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 235000013405 beer Nutrition 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000004737 colorimetric analysis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 230000031700 light absorption Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- 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
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Abstract
The present invention provides a kind of absorbance measuring circuit.The circuit includes: incident intensity measuring circuit, and measurement light passes through the incident intensity voltage before substance；Transmitted light intensity measuring circuit, measurement light pass through the transmitted light intensity voltage after substance；LOG computing circuit converts the incident intensity voltage and the transmitted light intensity voltage as incident intensity electric current and transmitted light intensity electric current, calculates the denary logarithm of the ratio of the two, obtains the first absorbance of substance；Operational amplification circuit amplifies processing according to first absorbance of the preset gain to the substance and obtains the second absorbance of substance；Low-pass filter circuit is filtered second absorbance, exports third absorbance.The present invention can directly measurement of species absorbance, do not need software developer and platform and multichannel high-performance AD circuit, the response time is fast, the linearity is high, at low cost, accuracy is high, signal-to-noise ratio is high, wide input voltage range, output impedance is low, realization is simple.
Description
Technical field
The present invention relates to absorbance field of measuring technique, and in particular to a kind of absorbance measuring circuit.
Background technique
In recent years, in various fields such as environmental monitoring, chemical analysis, medicine and pharmacology, biology, analysis instruments largely using suction
The analysis methods such as light photometry, colorimetric analysis, photoelectric colorimetry to carry out qualitative and quantitative analysis, these analysis sides to substance
Method is all based on this philosophy of one Bill of lambert.One Beer law of lambert (Lambert-Beer law) is spectrophotometry
Philosophy, be that description substance is thick to the power (absorbance) of a certain wavelength light absorption and the concentration of extinction material and its liquid layer
Relationship between degree.It is crucial that the absorbance of measurement of species, materials absorbed light degree measure accurate in one Beer law of lambert
Property will directly influence the analysis result of instrument.
In the prior art scheme, the overwhelming majority is all using spectrophotometer, cuvette, spectrum to the measurement of absorbance
The devices such as instrument cooperate multichannel high performance AD Acquisition Circuit to measure incident intensity and transmitted light intensity, then measuring
To light intensity voltage send software computing flat to, software computing flat obtains the extinction of substance by complicated calculating again
Degree.
Inventors have found that this technical solution height depended software platform, higher to the performance requirement of operation platform, response
Time is slow, needs the high performance AD Acquisition Circuit of multichannel, realizes complexity, needs software developer and operation platform at high cost.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of absorbance measuring circuit, does not need software developer and software
Platform and the high performance AD Acquisition Circuit of multichannel, and the absorbance of directly measurement of species.
The embodiment of the invention provides a kind of absorbance measuring circuits, comprising:
Incident intensity measuring circuit, measurement light pass through the incident intensity voltage before substance；
Transmitted light intensity measuring circuit, measurement light pass through the transmitted light intensity voltage after substance；
LOG computing circuit, convert the incident intensity voltage and the transmitted light intensity voltage into incident intensity electric current and thoroughly
Light intensity electric current is penetrated, the denary logarithm of the ratio of the incident intensity electric current and the transmitted light intensity electric current is calculated, obtains
First absorbance of substance；
Operational amplification circuit amplifies processing according to first absorbance of the preset gain to the substance and obtains substance
The second absorbance；
Low-pass filter circuit is filtered second absorbance, exports third absorbance.
Further, the absorbance measuring circuit further include:
Power supply stabilization circuit carries out steady pressure treatment to system input power and provides a stable work electricity to the circuit
Source.
Further, the incident intensity measuring circuit includes:
First photoelectric detector, measurement light by the incident intensity before substance, generate with the incident intensity at
The incident intensity electric current of ratio；
The incident intensity electric current is converted to the incident intensity voltage by the first measuring circuit.
Further, first measuring circuit includes operational amplifier U1B, resistance R11, capacitor C15, wherein
5 feet of the operational amplifier U1B are connected to power ground together with the anode of first photoelectric detector, described
6 feet of operational amplifier U1B and the cathode of first photoelectric detector, one end of the resistance R11, the capacitor C15
One end connection, 7 feet of the operational amplifier U1B are connect with the other end of the other end of the resistance R11, the capacitor C15.
Further, the transmitted light intensity measuring circuit includes:
Second photoelectric detector, measurement light by the transmitted intensity after substance, generate with the transmitted intensity at
The transmitted light intensity electric current of ratio；
The transmitted light intensity electric current is converted to the transmitted light intensity voltage by the second measuring circuit.
Further, second measuring circuit includes operational amplifier U1A, resistance R7, capacitor C7, C9, C13, wherein
4 feet of the operational amplifier U1A are connected to one end of the capacitor C9, and the other end of the capacitor C9 is connected to
The power ground, 8 feet of the operational amplifier U1A are connected to one end of the capacitor C13, the other end of the capacitor C13
It is connected to the power ground, 3 feet of the operational amplifier U1A are connected to institute together with the anode of second photoelectric detector
State power ground, 2 feet of the operational amplifier U1A and the cathode of second photoelectric detector, one end of the resistance R7, institute
State one end connection of capacitor C7,1 foot and the other end of resistance R7, the other end of the capacitor C7 of the operational amplifier U1A
Connection.
Further, the LOG computing circuit include LOG operation chip U5, resistance R10, R13, capacitor C11, C14,
C17, wherein
The resistance R13 is connected to 7 feet of the operational amplifier U1B, and 1 foot of the LOG operation chip U5 is connected to
The other end of the resistance R13, one end of the resistance R10 are connected to 1 foot of the operational amplifier U1A, the LOG operation
3 feet of chip U5 are connected to one end of the capacitor C14, and 8 feet of the LOG operation chip U5 are connected to the resistance R10's
4 feet of the other end of the other end and the capacitor C14, the LOG operation chip U5 connect one end of the capacitor C17, described
The other end of capacitor C17 connects the power ground, and 5 feet of the LOG operation chip U5 connect one end of the capacitor C11, institute
The other end for stating capacitor C11 connects the power ground, and 6 feet of the LOG operation chip U5 connect the power ground.
Further, the operational amplification circuit includes operational amplifier U2B, resistance R12, R14, wherein
5 feet of the operational amplifier U2B connect 3 feet of the LOG operation chip U5, and the 6 of the operational amplifier U2B
Foot is connect with one end of described resistance R12, R14, and the other end of the resistance R14 connects the power ground, the operation amplifier
7 feet of device U2B connect the other end of the resistance R12.
Further, the low-pass filter circuit include operational amplifier U2A, resistance R8, R9, capacitor C8, C10, C12,
C16, wherein
4 feet of the operational amplifier U2A are connect with one end of the capacitor C16, the other end connection of the capacitor C16
The power ground, 8 feet of the operational amplifier U2A are connect with one end of the capacitor C12, the other end of the capacitor C12
The power ground is connected, 3 feet of the operational amplifier U2A are connect with one end of the resistance R8, capacitor C10, the resistance
One end of R9 connects 7 feet of the U2B, and the other end of the capacitor C10 connects the power ground, the other end of the resistance R8
It is connect with one end of the other end of the resistance R9, the capacitor C8,1 foot, 2 feet and the electricity of the operational amplifier U2A
Hold the other end connection of C8.
Further, the power supply stabilization circuit include voltage stabilizing chip U3, voltage stabilizing chip U4, resistance R1, R2, R3, R4,
R5, R6, capacitor C1, C2, C3, C4, C5, C6, wherein
5 feet of the voltage stabilizing chip U3 connect one end of the resistance R1, capacitor C1, the other end connection of the resistance R1
The negative terminal of input power, the other end of the capacitor C1 connect the power ground, and 6 feet of the voltage stabilizing chip U3 pass through the electricity
Hold the C2 connection power ground, 8 feet of the voltage stabilizing chip U3 connect the negative terminal of the input power, the voltage stabilizing chip U3's
4 feet connect the power ground, and 2 feet of the voltage stabilizing chip U3 connect one end of described resistance R3, R5, the voltage stabilizing chip U3's
1 foot connects 8 feet of the operational amplifier U1,8 feet of the operational amplifier U2,5 feet of the LOG operation chip U5, institute
The other end of resistance R3 and one end of the capacitor C5 are stated, the other end of the capacitor C5 is connected with the other end of the resistance R5
The power ground；
5 feet of the voltage stabilizing chip U4 connect one end of the resistance R2, capacitor C3, the other end connection of the resistance R2
The other end of the anode of the input power, the capacitor C3 connects the power ground, and 6 feet of the voltage stabilizing chip U4 pass through institute
The capacitor C4 connection power ground is stated, 8 feet of the voltage stabilizing chip U4 connect the anode of the input power, the voltage stabilizing chip
4 feet of U4 connect the power ground, and 2 feet of the voltage stabilizing chip U4 connect one end of described resistance R4, R6, the voltage stabilizing chip
1 foot of U4 connect 4 feet of the operational amplifier U1,4 feet of the operational amplifier U2, the LOG operation chip U5 4
One end of foot, the other end of the resistance R4 and the capacitor C6, the other end of the capacitor C6 and the resistance R6's is another
End connects the power ground.
Absorbance measuring circuit provided in an embodiment of the present invention, can directly measurement of species absorbance, without soft
Part developer and software platform do not need the high performance AD Acquisition Circuit of multichannel, have the response time is fast, the linearity is high, at
This is low, accuracy is high, signal-to-noise ratio is high, wide input voltage range, output impedance is low, realizes the advantages that simple.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of absorbance measuring circuit composition schematic diagram that one embodiment of the invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to drawings and examples,
The specific embodiment progress of technical solution of the present invention in further detail, is clearly illustrated.However, specific implementations described below
Mode and embodiment are for illustrative purposes only, rather than limiting the invention.It only contains a part of the invention and implements
Example, instead of all the embodiments, the other embodiments that those skilled in the art obtain various change of the invention all belong to
In the scope of protection of the invention.
Although it should be understood that the first, second, third, etc. term can be used in this article be used to describe various elements or
Component, but these elements or component should not be limited by these terms.These terms only to distinguish an element or component with
Another element or component.Therefore, the first element or component of following the discussion, holds within the present invention not departing from, is referred to alternatively as
Second element or the second component.
Fig. 1 is a kind of absorbance measuring circuit composition schematic diagram that one embodiment of the invention provides, including incident intensity is surveyed
Measure circuit 1, transmitted light intensity measuring circuit 2, LOG (logarithm, logarithm) computing circuit 3, operational amplification circuit 4, low-pass filtering
Circuit 5, power supply stabilization circuit 6.
Incident intensity measuring circuit 1 measures light and passes through the incident intensity voltage before substance.Transmitted light intensity measuring circuit 2 is surveyed
It measures light and passes through the transmitted light intensity voltage after substance.The ratio of LOG computing circuit 3 calculating incident intensity voltage and transmitted light intensity voltage
The denary logarithm of value obtains the first absorbance of substance.Operational amplification circuit 4 is according to preset gain to the of substance
One absorbance amplifies processing and obtains the second absorbance of substance.Low-pass filter circuit 5 is filtered place to the second absorbance
Reason exports third absorbance.Power supply stabilization circuit 6 to system input power carry out steady pressure treatment to circuit provide one it is stable
Working power.
Absorbance is a noun of physics and chemistry.Refer to light by incident intensity before solution or substance with
Denary logarithm (i.e. lg (the I0/ that light passes through the ratio (I0/I1) of the transmitted intensity after solution or a certain substance
I1)), wherein I0 is incident intensity, and I1 is transmitted light intensity.
Incident intensity measuring circuit 1 includes the first photoelectric detector, the first measuring circuit.
First photoelectric detector measures light by the incident intensity before substance, generates proportional to incident intensity
Incident intensity electric current.Incident intensity electric current is converted to incident intensity voltage by the first measuring circuit.
First measuring circuit includes operational amplifier U1B, resistance R11, capacitor C15.Wherein, 5 feet of operational amplifier U1B
Power ground, 6 feet of operational amplifier U1B and the yin of the first photoelectric detector are connected to together with the anode of the first photoelectric detector
One end connection of pole, one end of resistance R11, capacitor C15,7 feet of operational amplifier U1B and the other end, the capacitor of resistance R11
The other end of C15 connects.
Transmitted light intensity measuring circuit 2 includes the second photoelectric detector, the second measuring circuit.
Second photoelectric detector measures light by the transmitted intensity after substance, generates proportional to transmitted intensity
Transmitted light intensity electric current.Transmitted light intensity electric current is converted to transmitted light intensity voltage by the second measuring circuit.
Second measuring circuit includes operational amplifier U1A, resistance R7, capacitor C7, C9, C13.Wherein, operational amplifier U1A
4 feet be connected to one end of capacitor C9, the other end of capacitor C9 is connected to power ground, and 8 feet of operational amplifier U1A are connected to electricity
Hold one end of C13, the other end of capacitor C13 is connected to power ground, 3 feet of operational amplifier U1A and the second photoelectric detector
Anode is connected to power ground, 2 feet and the cathode of the second photoelectric detector, one end of resistance R7, the electricity of operational amplifier U1A together
Hold one end connection of C7,1 foot of operational amplifier U1A is connect with the other end of the other end of resistance R7, capacitor C7.
LOG computing circuit 3 includes LOG operation chip U5, resistance R10, R13, capacitor C11, C14, C17.
Resistance R13 is connected to 7 feet of operational amplifier U1B, and 1 foot of LOG operation chip U5 is connected to the another of resistance R13
End, one end of resistance R10 are connected to 1 foot of operational amplifier U1A, and 3 feet of LOG operation chip U5 are connected to the one of capacitor C14
End, 8 feet of LOG operation chip U5 are connected to the other end of resistance R10 and the other end of capacitor C14, and the 4 of LOG operation chip U5
Foot connects one end of capacitor C17, and the other end of capacitor C17 connects power ground, the 5 feet connection capacitor C11's of LOG operation chip U5
One end, the other end of capacitor C11 connect power ground, and 6 feet of LOG operation chip U5 connect power ground.
Operational amplification circuit 4 amplifies processing to the absorbance of substance according to the gain of setting to meet rear class system
Measurement request.Operational amplification circuit 4 includes operational amplifier U2B, resistance R12, R14.
3 feet of the 5 feet connection LOG operation chip U5 of operational amplifier U2B, 6 feet and resistance R12 of operational amplifier U2B,
One end of R14 connects, and the other end of resistance R14 connects power ground, and the 7 feet connection resistance R12's of operational amplifier U2B is another
End.
Low-pass filter circuit 5 can filter out High-frequency Interference noise, improve the signal-to-noise ratio of system, and reduce the output resistance of system
It is anti-.Low-pass filter circuit 5 includes operational amplifier U2A, resistance R8, R9, capacitor C8, C10, C12, C16.
4 feet of operational amplifier U2A are connect with one end of capacitor C16, and the other end of capacitor C16 connects power ground, operation
8 feet of amplifier U2A are connect with one end of capacitor C12, the other end connection power ground of capacitor C12, and the 3 of operational amplifier U2A
Foot is connect with one end of resistance R8, capacitor C10, and 7 feet of one end connection U2B of resistance R9, the other end of capacitor C10 connects power supply
The other end on ground, resistance R8 is connect with one end of the other end of resistance R9, capacitor C8,1 foot, 2 feet and the electricity of operational amplifier U2A
Hold the other end connection of C8.
Power supply stabilization circuit 6 carries out steady pressure treatment to improve system input voltage range and for rear class to system input power
Circuit provides a precision height, the operating voltage that ripple is small, noise is low.Power supply stabilization circuit includes voltage stabilizing chip U3, pressure stabilizing core
Piece U4, resistance R1, R2, R3, R4, R5, R6, capacitor C1, C2, C3, C4, C5, C6.
5 feet of voltage stabilizing chip U3 connect one end of resistance R1, capacitor C1, and the other end connection input power of resistance R1 is born
End, the other end of capacitor C1 connect power ground, and 6 feet of voltage stabilizing chip U3 are by capacitor C2 connection power ground, and the 8 of voltage stabilizing chip U3
Foot connects the negative terminal of input power, and 4 feet of voltage stabilizing chip U3 connect power ground, the connection of 2 feet resistance R3, R5's of voltage stabilizing chip U3
One end, voltage stabilizing chip U3 1 foot connection 8 feet of operational amplifier U1,8 feet of operational amplifier U2, LOG operation chip U5 5
The other end of one end of foot, the other end of resistance R3 and capacitor C5, capacitor C5 connects power ground with the other end of resistance R5.
5 feet of voltage stabilizing chip U4 connect one end of resistance R2, capacitor C3, and the other end connection input power of resistance R2 is just
End, the other end of capacitor C3 connect power ground, and 6 feet of voltage stabilizing chip U4 are by capacitor C4 connection power ground, and the 8 of voltage stabilizing chip U4
Foot connects the anode of input power, and 4 feet of voltage stabilizing chip U4 connect power ground, the connection of 2 feet resistance R4, R6's of voltage stabilizing chip U4
One end, voltage stabilizing chip U4 1 foot connection 4 feet of operational amplifier U1,4 feet of operational amplifier U2, LOG operation chip U5 4
The other end of one end of foot, the other end of resistance R4 and capacitor C6, capacitor C6 connects power ground with the other end of resistance R6.
The working principle of this circuit is as described below.
The positive and negative power supply of system input after power supply chip U3, U4 in power supply stabilization circuit 6 for late-class circuit by that can mention
For a precision height, the good quality work power supply that ripple is small, noise is low, the stability and signal-to-noise ratio of late-class circuit are improved, is increased
System inputs power supply voltage range, reduces system to the performance requirement of input power.
The first photoelectric detector, the second Photoelectric Detection are used in incident intensity measuring circuit 1 and transmitted light intensity measuring circuit 2
Device measures the intensity of light, and when there is light to irradiate photoelectric detector, photoelectric detector itself can generate one and intensity proportional
Electric current, by operational amplifier U1 and resistance R7, R11 photoelectric detector in the first measuring circuit, the second measuring circuit
Electric current be converted to voltage, obtain incident intensity voltage and transmitted light intensity voltage, the addition of capacitor C7, C15 can filter out high frequency
Noise jamming and the stability for improving circuit.
LOG computing circuit 3 is used to calculate light and passes through the transmission after substance with light by the incident intensity before substance
The ratio of luminous intensity, that is, the absorbance of substance.In LOG computing circuit 3 by resistance R13, R10 to incident intensity voltage and
Transmitted light intensity voltage transformation is at incident intensity electric current and transmitted light intensity electric current, wherein the resistance value of resistance R13, R10 are equal.It is right again
Incident intensity electric current and transmitted light intensity electric current carry out LOG operation, that is to say that calculating light passes through the incident intensity pair before substance
The electric current answered and light by the denary logarithm of the ratio (I0/I1) of the corresponding electric current of transmitted intensity after substance,
That is lg (I0/I1), wherein I0 is incident intensity electric current, and I1 is transmitted light intensity electric current, has obtained the absorbance of substance.
Pass through a direct proportion amplifying circuit in operational amplification circuit 4 to the absorbance measured according to certain gain
Multiple amplifies processing to meet the measurement request of rear class system.
Low-pass filter circuit 5 uses a Second-Order Active Filters to be filtered to filter out the absorbance after gain
High frequency noise interference improves the signal-to-noise ratio of system, and the way of output for using a voltage follower reduces the defeated of circuit
Impedance out makes the absorbance of output carry out buffering with rear class system, be isolated.
It should be noted that each embodiment above by reference to described in attached drawing is only to illustrate the present invention rather than limits this
The range of invention, those skilled in the art should understand that, it is right under the premise without departing from the spirit and scope of the present invention
The modification or equivalent replacement that the present invention carries out, should all cover within the scope of the present invention.In addition, signified unless the context
Outside, the word occurred in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of in combination with any other embodiment all or part of come using.
Claims (10)
1. a kind of absorbance measuring circuit, comprising:
Incident intensity measuring circuit, measurement light pass through the incident intensity voltage before substance；
Transmitted light intensity measuring circuit, measurement light pass through the transmitted light intensity voltage after substance；
LOG computing circuit converts the incident intensity voltage and the transmitted light intensity voltage as incident intensity electric current and transmitted light
Heavy current calculates the denary logarithm of the ratio of the incident intensity electric current and the transmitted light intensity electric current, obtains substance
The first absorbance；
Operational amplification circuit amplifies processing according to first absorbance of the preset gain to the substance and obtains the of substance
Two absorbances；
Low-pass filter circuit is filtered second absorbance, exports third absorbance.
2. circuit according to claim 1, which is characterized in that further include:
Power supply stabilization circuit carries out steady pressure treatment to system input power and provides a stable working power to the circuit.
3. circuit according to claim 2, which is characterized in that the incident intensity measuring circuit includes:
First photoelectric detector, measurement light are generated proportional to the incident intensity by the incident intensity before substance
Incident intensity electric current；
The incident intensity electric current is converted to the incident intensity voltage by the first measuring circuit.
4. circuit according to claim 3, which is characterized in that first measuring circuit includes operational amplifier U1B, electricity
Hinder R11, capacitor C15, wherein
5 feet of the operational amplifier U1B are connected to power ground, the operation together with the anode of first photoelectric detector
6 feet of amplifier U1B and the cathode of first photoelectric detector, one end of the resistance R11, the capacitor C15 one end
Connection, 7 feet of the operational amplifier U1B are connect with the other end of the other end of the resistance R11, the capacitor C15.
5. circuit according to claim 4, which is characterized in that the transmitted light intensity measuring circuit includes:
Second photoelectric detector, measurement light are generated proportional to the transmitted intensity by the transmitted intensity after substance
Transmitted light intensity electric current；
The transmitted light intensity electric current is converted to the transmitted light intensity voltage by the second measuring circuit.
6. circuit according to claim 5, which is characterized in that second measuring circuit includes operational amplifier U1A, electricity
Hinder R7, capacitor C7, C9, C13, wherein
4 feet of the operational amplifier U1A are connected to one end of the capacitor C9, and the other end of the capacitor C9 is connected to described
Power ground, 8 feet of the operational amplifier U1A are connected to one end of the capacitor C13, the other end connection of the capacitor C13
To the power ground, 3 feet of the operational amplifier U1A are connected to the electricity together with the anode of second photoelectric detector
Source, 2 feet of the operational amplifier U1A and the cathode of second photoelectric detector, one end of the resistance R7, the electricity
Hold one end connection of C7,1 foot of the operational amplifier U1A is connect with the other end of the other end of resistance R7, the capacitor C7.
7. circuit according to claim 6, which is characterized in that the LOG computing circuit includes LOG operation chip U5, electricity
Hinder R10, R13, capacitor C11, C14, C17, wherein
The resistance R13 is connected to 7 feet of the operational amplifier U1B, and 1 foot of the LOG operation chip U5 is connected to described
The other end of resistance R13, one end of the resistance R10 are connected to 1 foot of the operational amplifier U1A, the LOG operation chip
3 feet of U5 are connected to one end of the capacitor C14, and 8 feet of the LOG operation chip U5 are connected to the another of the resistance R10
The other end at end and the capacitor C14,4 feet of the LOG operation chip U5 connect one end of the capacitor C17, the capacitor
The other end of C17 connects the power ground, and 5 feet of the LOG operation chip U5 connect one end of the capacitor C11, the electricity
The other end for holding C11 connects the power ground, and 6 feet of the LOG operation chip U5 connect the power ground.
8. circuit according to claim 7, which is characterized in that the operational amplification circuit includes operational amplifier U2B, electricity
Hinder R12, R14, wherein
5 feet of the operational amplifier U2B connect 3 feet of the LOG operation chip U5,6 feet of the operational amplifier U2B with
One end of described resistance R12, R14 connect, and the other end of the resistance R14 connects the power ground, the operational amplifier U2B
7 feet connect the other end of the resistance R12.
9. circuit according to claim 8, which is characterized in that the low-pass filter circuit includes operational amplifier U2A, electricity
Hinder R8, R9, capacitor C8, C10, C12, C16, wherein
4 feet of the operational amplifier U2A are connect with one end of the capacitor C16, described in the other end connection of the capacitor C16
Power ground, 8 feet of the operational amplifier U2A are connect with one end of the capacitor C12, the other end connection of the capacitor C12
The power ground, 3 feet of the operational amplifier U2A are connect with one end of the resistance R8, capacitor C10, the resistance R9's
One end connects 7 feet of the U2B, and the other end of the capacitor C10 connects the power ground, the other end of the resistance R8 and institute
State one end connection of the other end, the capacitor C8 of resistance R9,1 foot, 2 feet and the capacitor C8 of the operational amplifier U2A
The other end connection.
10. circuit according to claim 9, which is characterized in that the power supply stabilization circuit includes voltage stabilizing chip U3, pressure stabilizing
Chip U4, resistance R1, R2, R3, R4, R5, R6, capacitor C1, C2, C3, C4, C5, C6, wherein
5 feet of the voltage stabilizing chip U3 connect one end of the resistance R1, capacitor C1, and the other end of the resistance R1 connects input
The negative terminal of power supply, the other end of the capacitor C1 connect the power ground, and 6 feet of the voltage stabilizing chip U3 pass through the capacitor C2
The power ground is connected, 8 feet of the voltage stabilizing chip U3 connect the negative terminal of the input power, 4 feet of the voltage stabilizing chip U3
The power ground is connected, 2 feet of the voltage stabilizing chip U3 connect one end of described resistance R3, R5,1 foot of the voltage stabilizing chip U3
Connect 5 feet, the electricity of 8 feet of the operational amplifier U1,8 feet of the operational amplifier U2, the LOG operation chip U5
The other end of R3 and one end of the capacitor C5 are hindered, described in the other end of the capacitor C5 is connected with the other end of the resistance R5
Power ground；
5 feet of the voltage stabilizing chip U4 connect one end of the resistance R2, capacitor C3, described in the other end connection of the resistance R2
The anode of input power, the other end of the capacitor C3 connect the power ground, and 6 feet of the voltage stabilizing chip U4 pass through the electricity
Hold the C4 connection power ground, 8 feet of the voltage stabilizing chip U4 connect the anode of the input power, the voltage stabilizing chip U4's
4 feet connect the power ground, and 2 feet of the voltage stabilizing chip U4 connect one end of described resistance R4, R6, the voltage stabilizing chip U4's
1 foot connects 4 feet of the operational amplifier U1,4 feet of the operational amplifier U2,4 feet of the LOG operation chip U5, institute
The other end of resistance R4 and one end of the capacitor C6 are stated, the other end of the capacitor C6 is connected with the other end of the resistance R6
The power ground.
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Inventor after: Ao Xiaoqiang Inventor after: Ju Linlin Inventor after: Liang Xuejun Inventor before: Ao Xiaoqiang Inventor before: Ju Linlin |
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Application publication date: 20181221 |