KR101657153B1 - A wide range current-to-voltage module for radiation measurement - Google Patents
A wide range current-to-voltage module for radiation measurement Download PDFInfo
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- KR101657153B1 KR101657153B1 KR1020160094534A KR20160094534A KR101657153B1 KR 101657153 B1 KR101657153 B1 KR 101657153B1 KR 1020160094534 A KR1020160094534 A KR 1020160094534A KR 20160094534 A KR20160094534 A KR 20160094534A KR 101657153 B1 KR101657153 B1 KR 101657153B1
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- 238000005259 measurement Methods 0.000 title claims abstract description 49
- 230000005855 radiation Effects 0.000 title claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims description 16
- 239000000872 buffer Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000003071 parasitic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/252—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with conversion of voltage or current into frequency and measuring of this frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/20—Measurement of non-linear distortion
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
Abstract
The present invention relates to a wide-range micro-current-voltage conversion module for radiation measurement, and more particularly, to a micro-current-voltage conversion module for measuring a current in a wide range of several pA to several tens of microamperes The noise that interferes with the measurement of the current can be effectively removed by the first and second low-frequency filters, so that the weak current can be linearly and precisely converted, and the offset voltage can be minimized And the reliability of radiation measurement can be improved by fabricating a conversion module that maintains very stable and accurate linearity over the entire range of several hundred pA to several tens of microamperes, When the radiation is measured, the user can select the correct conversion linearity according to the characteristics of the optical sensor. Hadeonga used to select the voltage converter module, or two kinds of micro-current-two different micro-current has the effect that can be eliminated that the conventional inconvenience that should be used by adopting with a voltage transformation module.
Description
The present invention proposes a module for converting a minute current signal output from an optical sensor used in a radiation detector into a voltage by measuring a current output over a wide range of several pA to several tens of microamperes, The first and second low-frequency filters can be effectively removed to linearly accurately and precisely convert a weak current. In addition, accuracy can be improved by minimizing an offset voltage, and a wide range of fine current output it is possible to improve the reliability of the radiation measurement by manufacturing a conversion module that maintains a very stable and precise linearity over the entire range of pA to several tens of microamperes. In the radiation measurement, Two microcurrent-to-voltage conversion modules can be selected for use, or two microcurrent- Voltage conversion module for radiometric measurement that can solve the conventional inconvenience of using a voltage conversion module together.
Among the radiation measuring apparatuses, since the energy can be distinguished, a flash detector which is most importantly used is essentially used as an optical sensor for converting photons generated from the scintillation material into electric signals.
2, an input signal in the form of a negative (-) current output from the optical sensor is converted into a voltage signal by a TIA (Transimpedance Amplifier) or a current-voltage amplifier, And then displayed by a predetermined program.
1, if the current signal on the input side is I [A] and the feedback resistance of the operational amplifier is R [OMEGA], the current-voltage amplifier (TIA)
The range of currents that a photosensor can output in response to visible light is a very wide range, starting at several hundreds ㎀ (darkest) to a few tens of ((brightest). Since the range of the input voltage that can be accepted by the ADC to be converted into a voltage is 0 to 5 V, for example, when a device converting 20 ㎂ to 5 V is used, 200 ㎀ is converted to 50..
However, even though the performance of the operational amplifier used in this circuit is excellent, it has various related noises. In other words, there is an electronic circuit noise ranging from about several tens to about 100 등 including noise (~ several tens ㎶) by input voltage, noise (~ several ㎶) by input current and noise .
Therefore, if the output voltage of the microcurrent-to-voltage conversion module is about 5 V, the influence of the noise is very small (about 0.00088%), which is much smaller than the error of the measuring instrument. However, If it is about 50., The effect of noise (about 88%) becomes bigger and it can not be used in this range.
In the conventional technique, the linearity of the current-voltage conversion is not ensured even when the operational amplifier circuit is supplemented as shown in Fig. 3 (a) below, when the input current of the current-voltage conversion curve is 5.0 ㎁ or less. In some cases, as shown in FIG. 3 (b), the linearity is damaged by the feedback resistance of the operational amplifier and the parasitic resistance of the optical sensor at an input current of less than 100 V, and a pole is formed at 20 V to make the system unstable and Fig group.
In addition, the optical sensor is used for nuclide analysis and precise measurement of radiation. The output of the optical sensor is a very fine DC current output by electron amplification in a vacuum tube. The current-voltage conversion module is used to process this minute current signal. The range of the microcurrent output of the optical sensor is about several tens of microamperes to several tens of microamperes to about 10 7 amperes. In order to accurately measure the radiation, the micro-current output is converted into a voltage and the signal is processed and read.
Therefore, the linear conversion of the microcurrent-voltage output from the optical sensor is a very important factor in the accuracy of the radiation measurement. However, it is difficult to maintain the linearity in the range of about 10 ~ 7 because of the wide range of the microcurrent output of the optical sensor. Especially, when the microcurrent is below several ㎁, the influence of the noise current on the circuit becomes large, , It is inconvenient for the user to select two micro current-to-voltage conversion modules with different conversion linearity according to the characteristics of the optical sensor, or use two micro current-to-voltage conversion modules together.
Therefore pA to to produce a module of the noise that might interfere with the measurement of the
SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a module for converting a minute current signal output from an optical sensor used in a radiation detector into a voltage by measuring a current output over a wide range of several pA to several tens of microamperes The noise that interferes with the measurement of the current can be effectively removed by the first and second low-frequency filters, thereby precisely and precisely converting a weak current linearly, while minimizing the offset voltage and improving the accuracy And to provide a wide range of fine current-to-voltage conversion modules for radiation measurement.
Another object of the present invention is to provide a conversion module capable of maintaining a highly stable and accurate linearity over a range of several hundred pA to several tens of microamperes To provide a wide range of fine current-to-voltage conversion modules.
It is a further object of the present invention to provide a method and apparatus for measuring a radiation dose by selecting two micro current-to-voltage conversion modules with different conversion linearity according to the characteristics of an optical sensor or by using two micro current- And to solve the conventional inconvenience of using a wide range of minute current-to-voltage conversion modules for radiation measurement.
According to an aspect of the present invention, there is provided a wide range micro current-to-voltage conversion module for measuring radiation, comprising: a radiation detector for detecting a radiation, wherein the micro current input signal output from the optical sensor is a first low frequency A first low pass filter (LPF) for removing a noise current included in an input current by the optical sensor when the filter is inputted; A TIA (Transimpedance Amplifier) mounted at the rear end of the first low-pass filter for converting the voltage into a voltage corresponding to an input current to be measured and outputting the voltage; A second low-frequency filter mounted on a rear end of the micro-current-voltage converter for removing noise due to an input voltage of the micro-current-to-voltage converter, noise caused by an optical sensor on an input side, LPF); An offset compensation circuit means for compensating for an input offset voltage of the microcurrent-to-voltage converter from the output signal of the second low-pass filter; An instrumentation amplifier for increasing a common mode rejection ratio (CMRR) and an input impedance in a signal from the offset compensation circuit means and minimizing a drift phenomenon caused by an input offset voltage and a temperature; An analog to digital converter (ADC) having a resolution of 16 bits and converting an analog voltage signal from the measurement amplifier into a digital voltage signal; A microcontroller (CPU) which is digitized through the analog-to-digital converter and then operated by a predetermined program and displayed by a display unit; RS232C communication means for communicating data and information with the outside using RS232C communication; Power supply means for applying +5 VDC for digital and ± 15 VDC for analog to all the components and circuit means constituting the microcurrent-to-voltage conversion module; .
In the present invention, when the first low-pass filter connects a resistor for a low-frequency filter in parallel with an input current between the last stage of the input current and the front stage of the micro-current-voltage converter, the circuit is converted to a equivalent circuit of the The second low-pass filter is a circuit which functions to block the noise current contained in the input current by forming the input equivalent capacitance of the feedback capacitor and the low-pass filter circuit, and the second low- The offset compensating circuit is a circuit which functions as an input offset voltage compensating circuit of the buffer amplifier. The offset compensating circuit is a circuit that functions as an output equivalent capacitor of the feedback capacitor and a low-pass filter circuit so as to block various noise of the operational amplifier. , To remove the input offset voltage that the microcurrent-to-voltage converter itself has Characterized in that it comprises equal to the input voltage of the buffer amplifier output voltage and a higher voltage of the converter such that the circuit for adjusting the voltage of the variable regulator-current state, the darkness when the micro-current.
In the present invention, the output adjusting circuit means connected to the instrumentation amplifier for adjusting the voltage output from the instrumentation amplifier; Further comprising:
In the present invention, an ICD (In-Circuit Debugger) for downloading and debugging the program is controlled by the microcontroller (CPU). Further comprising:
In the present invention, the feedback capacitor connected to both ends of the input and output of the microcurrent-to-voltage converter (TIA) for operating the microcurrent-to-voltage converter (TIA) The amplified waveform may become unstable and oscillation may occur, so that the feedback capacitor is used to compensate for the phase margin.
As described above, the present invention provides a wide range of fine current-to-voltage conversion module for radiation measurement, which has the following effects.
First, the present invention proposes a module for converting a minute current signal output from an optical sensor used in a radiation detector into a voltage by measuring a current output over a wide range of several pA to several tens of microamperes, The noise can be effectively removed by the first and second low-frequency filters, and the weak current can be converted linearly and precisely, as well as the accuracy can be improved by minimizing the offset voltage.
Second, the reliability of the radiation measurement can be improved by fabricating a conversion module that maintains a very stable and accurate linearity over a range of several pA to several tens of microamperes, which is a wide range of micro current output of the optical sensor.
Third, in the present invention, the user must select two micro current-voltage conversion modules having different conversion linearities according to the characteristics of the optical sensor or use two micro current-voltage conversion modules together The conventional inconvenience can be solved.
1 is a circuit diagram of a conventional current / voltage converter;
2 is a block diagram of a conventional current / voltage converter circuit diagram;
Fig. 3 (a) is a diagram showing input / output curves of a current / voltage amplifier complemented with a conventional operational amplifier circuit; Fig.
Fig. 3 (b) shows an input / output curve for forming a pole of a conventional current / voltage amplifier. Fig.
4 is a block diagram showing a configuration of a wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention.
5 is a detailed circuit diagram of a wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention.
6 is a diagram illustrating an input / output relationship of a wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of the equivalent circuit of a Nohtone circuit in a detailed circuit of a wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention.
FIG. 8 is a photograph showing a shape of a wide-range fine current-to-voltage conversion module for radiation measurement according to an embodiment of the present invention. FIG.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of related art or configuration may unnecessarily obscure the gist of the present invention, The description will be omitted and the terms described below are defined in consideration of the functions of the present invention and can be changed according to the intention of the user, And should be based on the contents of this specification which describe the module.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed current / voltage conversion module for a radiation measurement according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 4 is a block diagram illustrating a configuration of a wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention. FIG. 5 is a block diagram of a wide- FIG. 6 is a diagram illustrating the input / output relationship of the wide-range microcurrent-to-voltage conversion module for radiation measurement according to an embodiment of the present invention, and FIG. 7 is a detailed circuit diagram of the wide- FIG. 8 is a photographic view showing a shape of a wide-range micro-current-voltage conversion module for radiation measurement according to an embodiment of the present invention.
As shown in FIGS. 4 to 8, the wide current micro-current-to-
The function of each technical means constituting the broad current micro-current conversion module for radiation measurement of the present invention will be described as follows.
When the micro current input signal outputted from the optical sensor detects the radiation and enters the first low-
The micro-current-voltage converter (TIA) 20 is mounted on the rear end of the first low-
The second low-pass filter (LPF) 30 is mounted on the rear end of the micro-current-voltage converter. The second low-pass filter (LPF) 30 receives noise due to the input voltage of the micro- It removes the noise of the transducer itself. Here, the second low-
The offset compensation circuit means (40) compensates for the input offset voltage of the microcurrent-to-voltage converter by compensating for the output signal from the low-pass filter. Here, the offset compensating circuit means 40 is an input offset voltage compensating circuit of the buffer amplifier. When the input current is in the dark state, And the voltage of the variable regulator is adjusted so that the output voltage of the voltage converter and the input voltage of the upper buffer amplifier become equal to each other.
The
The output adjustment circuit means 60 is connected to the
The analog-to-digital converter (ADC) 70 converts an analog voltage signal output from the
The microcontroller (CPU) 80 is digitized through the analog-to-
The RS232C communication unit 90 communicates data and information with the outside using RS232C communication.
The power supply means 100 applies +5 VDC for digital and ± 15 VDC for analog to all components and circuit means constituting the microcurrent-to-voltage conversion module.
The ICD (In-Circuit Debugger) 110 is controlled by the microcontroller (CPU) 80 to download and debug the program.
The feedback capacitor connected to the input and output of the microcurrent-to-voltage converter (TIA) 20 for operating the microcurrent-to-voltage converter (TIA) 20 in the stable phase region is a micro current- If there is no margin in the phase of the
5 is a detailed circuit diagram of a wide current micro-current conversion module for radiation measurement. In FIG. 5, I1 is a DC micro current generated in response to light in an optical sensor. The operational amplifier U1 is a TIA (Transimpedance Amplifier) that converts the input current I to be measured into a voltage corresponding thereto and outputs the voltage. The circuit consisting of Ri and Ci is a first low-pass filter (LPF) that removes the noise current included in the input current. Cf is a feedback capacitor for eliminating instability of input optical sensor and operational amplifier U1. The circuit consisting of Co and Ro is a second low-pass filter (LPF) for removing noise due to the input voltage of the operational amplifier U1, noise caused by the optical sensor on the input side, and noise in the operational amplifier itself.
An amplifier consisting of U2, U3, and U4 at the downstream of the TIA is designed to increase common mode rejection ratio (CMRR) and input impedance, while U4 minimizes drift due to input offset voltage and temperature (Instrumentation Circuit). U2 and U3 in front of this amplification circuit are buffer amplifier circuits. In order to cancel the offset voltage of U1, the output voltage of U1 and the non-inverting input voltage of U2 are the same when dark state, So that the output voltage of U4 becomes zero. In order to improve the common mode rejection ratio, the resistor R16 on the non-inverting input side of U4 is designed as a variable resistor. In this situation, the output of U1 becomes the output of U4 and is transferred to ADC (Analog to Digital Converter).
In addition, the analog-to-digital converter (ADC) has a resolution of 16 bits, and the program is operated by the microcontroller. At this time, it is designed to download the program through ICD (In-Circuit Debugger). RS232C communication is used to communicate data and information with the outside. The power of all circuits should be +5 VDC for digital and ± 15 VDC for analog.
As a result of measuring the input / output relationship by fabricating the current-voltage conversion module by applying the specification value of the necessary parts so that the input current of 20 ㎂ maximum can be linearly converted to the output voltage of 5 V by the conversion circuit of FIG. 5, The input / output relationship is shown in FIG. That is, it is confirmed that the linearity is maintained not only below 2.0 아니라 but also below 10 킴 in converting current into voltage.
5, Ri is connected in parallel to the input section of the operational amplifier U1, a feedback capacitor Cf for stabilizing the circuit is connected in series between the inverting input and the output, and Ro is connected to the output circuit Respectively. In the figure, Ci is the input equivalent capacitance due to Miller theorem of Cf, and Co is the output equivalent capacitance due to Miller theorem. The circuit looking at the left input side of the operational amplifier U1 is a Norton's circuit made up of the current source I and the resistor Ri and can be converted into a Thevenin's Equivalent Circuit as shown in FIG. : Low Pass Filter) circuit. Therefore, the cut-off frequency fci, which blocks high-frequency noise,
In order to operate the operational amplifier U1 in a stable region, Cf connected between the inverting input and the output is a feedback capacitor for frequency compensation
In order to remove the noise caused by the input voltage generated by the operational amplifier U1, the noise due to the input current, and the noise of the operational amplifier itself, if a low-frequency filter made of Ro and Co is connected to the output terminal of U1, do. The cut-off frequency fco
In the differential amplifier (U4) circuit, the final output voltage Vout is as follows.
Therefore, since the current from the optical sensor is an extremely fine DC current, a small noise may cause a problem. A first low-pass filter is placed at the front of the micro current-to-voltage converter (TIA) to remove the noise and then converted to a voltage through a micro current-to-voltage converter (TIA). However, since there is a small amount of noise in the operational amplifier, a resistor is connected in series behind the operational amplifier to form an equivalent output capacitor of the feedback capacitor and a second low-pass filter to remove the noise.
In addition, since the input offset voltage of the operational amplifier is also a problem, a buffer amplifier is placed in the measurement amplifier to compensate it. A variable resistor for increasing the common mode rejection ratio and adjusting the output is placed in front of the differential amplifier. In this way, a current-voltage converter with excellent linearity and high measurement accuracy is finally completed through a differential amplifier, and it is a module or product of micro current measurement manufactured using this concept.
As described above, the wide-range microcurrent-to-voltage conversion module for radiation measurement can be applied to radiation measurement in a nuclear power plant, and thus its application is wide.
It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
10: first low-pass filter 20: micro-current-voltage converter
30: second low-pass filter 40: offset compensation circuit means
50: Instrumentation amplifier 60: Output adjusting circuit means
70: analog-to-digital converter 80: microcontroller (CPU)
90: RS232C communication means 100: power supply means
110: In-Circuit Debugger (ICD)
Claims (5)
A fine current input signal outputted from the optical sensor by detecting the radiation is converted into a signal by the equivalent circuit of the non-equivalent circuit of the Nohtone circuit which removes the noise current included in the input current of the minute current- 1 low pass filter (LPF);
A TIA (Transimpedance Amplifier) mounted at the rear end of the first low-pass filter for converting the voltage into a voltage corresponding to an input current to be measured and outputting the voltage;
A second low-frequency filter mounted on a rear end of the micro-current-voltage converter for removing noise due to an input voltage of the micro-current-to-voltage converter, noise caused by an optical sensor on an input side, LPF);
An offset compensation circuit means for compensating for an input offset voltage of the microcurrent-to-voltage converter from the output signal of the second low-pass filter;
An instrumentation amplifier for increasing a common mode rejection ratio (CMRR) and an input impedance in a signal from the offset compensation circuit means and minimizing a drift phenomenon caused by an input offset voltage and a temperature;
An analog-to-digital converter (ADC) 16 that converts the analog voltage signal from the measurement amplifier into a digital voltage signal and has a resolution of 16 bits;
A microcontroller (CPU) which is digitized through the analog-to-digital converter and then operated by a predetermined program and displayed by a display unit;
RS232C communication means for communicating data and information with the outside using RS232C communication;
Power supply means for applying +5 VDC for digital and ± 15 VDC for analog to all the components and circuit means constituting the microcurrent-to-voltage conversion module; And a current detector for detecting a current flowing in the current detector.
If the resistor for the low frequency filter is connected in parallel with the input current between the rear end of the input current and the front end of the microcurrent-to-voltage converter, the first low-pass filter can be converted into a Tebner equivalent circuit as a Norton circuit. And a second low-pass filter connected in series with a resistor at a downstream end of the micro-current-voltage converter, wherein the input capacitance and the low-pass filter circuit are formed to block the noise current included in the input current, And the offset compensating circuit means is an input offset voltage compensating circuit of the buffer amplifier. The offset compensating circuit includes a fine current-to-voltage converter In order to eliminate the input offset voltage, And a circuit for adjusting the voltage of the variable regulator so that the output voltage of the three current-voltage converters becomes equal to the input voltage of the upper buffer amplifier.
Output adjustment circuit means connected to the measurement amplifier for adjusting a voltage output from the measurement amplifier; Further comprising: a micro current-to-voltage conversion module for radiation measurement.
An ICD (In-Circuit Debugger) for downloading and debugging the program, the program being controlled by the microcontroller (CPU); Further comprising: a micro current-to-voltage conversion module for radiation measurement.
The feedback capacitor connected across the input and output of the microcurrent-to-voltage converter (TIA) to operate the microcurrent-to-voltage converter (TIA) in a stable phase region is amplified when there is no margin in the phase of the microcurrent- And using a feedback capacitor to compensate for a phase margin because the waveform may become unstable and oscillation may occur.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101799346B1 (en) | 2017-07-12 | 2017-11-20 | 주식회사 우진엔텍 | Development of new readout apparatus using pulse peak-time capture for radiation detectors |
| CN108768310A (en) * | 2018-09-12 | 2018-11-06 | 齐鲁工业大学 | A kind of low-noise charge amplifier and its implementation for piezoelectric transducer |
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| KR101618502B1 (en) * | 2015-02-05 | 2016-05-10 | 강원대학교산학협력단 | Power-efficient RX apparatus employing bias-current-shared RF embedded frequency-translated RF bandpass filter |
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| KR20130052486A (en) * | 2011-11-11 | 2013-05-22 | 인터실 아메리카스 엘엘씨 | Optical proximity sensors with offset compensation |
| KR101266876B1 (en) * | 2011-11-25 | 2013-05-24 | 한국철도기술연구원 | Offset compensation filter circuit in position sensor for magnet |
| JP2016038219A (en) * | 2014-08-05 | 2016-03-22 | アルプス・グリーンデバイス株式会社 | Current sensor |
| KR101618502B1 (en) * | 2015-02-05 | 2016-05-10 | 강원대학교산학협력단 | Power-efficient RX apparatus employing bias-current-shared RF embedded frequency-translated RF bandpass filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101799346B1 (en) | 2017-07-12 | 2017-11-20 | 주식회사 우진엔텍 | Development of new readout apparatus using pulse peak-time capture for radiation detectors |
| CN108768310A (en) * | 2018-09-12 | 2018-11-06 | 齐鲁工业大学 | A kind of low-noise charge amplifier and its implementation for piezoelectric transducer |
| CN108768310B (en) * | 2018-09-12 | 2024-01-26 | 齐鲁工业大学 | Low-noise charge amplifier for piezoelectric sensor and implementation method thereof |
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