CN109374138A - A kind of infrared imaging circuit and noise-reduction method - Google Patents
A kind of infrared imaging circuit and noise-reduction method Download PDFInfo
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- CN109374138A CN109374138A CN201811088511.8A CN201811088511A CN109374138A CN 109374138 A CN109374138 A CN 109374138A CN 201811088511 A CN201811088511 A CN 201811088511A CN 109374138 A CN109374138 A CN 109374138A
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- 238000003331 infrared imaging Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 238000012163 sequencing technique Methods 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000005057 refrigeration Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
Classifications
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
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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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
-
- 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J5/061—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a kind of infrared imaging circuit and noise-reduction methods, comprising: infrared detector control module, direct current biasing module, temperature control module, analog front-end module, timing and data processing module, data transmission interface module and power conversion module.Have the advantages that design is simple, noise is low, high sensitivity using infrared imaging circuit of the present invention.
Description
Technical Field
The invention relates to an infrared imaging circuit and a noise reduction method, in particular to a low-noise infrared imaging circuit and a noise reduction method.
Background
The infrared imaging circuit is an important component of an infrared imaging system, and has the main functions of a) providing bias voltage and digital driving signals for an infrared detector and converting analog signals output by the infrared detector into digital signals. The noise level of the infrared imaging circuit will directly affect the imaging performance and sensitivity of the entire infrared imaging system.
The existing infrared imaging circuit design only considers the noise of the circuit, the noise of the whole system is not considered comprehensively, the noise level is higher, and the sensitivity of the whole infrared imaging system is further reduced, so that an infrared imaging circuit design method considering the low noise reduction design comprehensively is needed.
Disclosure of Invention
The invention aims to provide a noise reduction method of an infrared imaging circuit, which solves the problem that the existing infrared imaging circuit has higher noise level.
The infrared imaging circuit of the invention comprises: the device comprises an infrared detector control module, a direct current bias module, a temperature control module, an analog front end module, a time sequence and data processing module, a data transmission interface module and a power supply conversion module; wherein,
the input end of the infrared detector control module is connected with the output end of the time sequence and data processing module, the output end of the infrared detector control module is connected with the infrared detector, the output end of the direct current bias module is connected with the infrared detector, the input end of the direct current bias module is connected with the output end of the temperature control module, the input end of the temperature control module is connected with the output end of a temperature measuring diode of the infrared detector, the output end of the temperature control module is connected with the direct current bias module, the signal output end of the infrared detector is connected with the analog front end module, the output end of the analog front-end module is connected with the input end of the time sequence and data processing module, the output end of the time sequence and data processing module is also connected with the data transmission interface module, and the power supply conversion module is electrically connected with each module.
Further, the infrared detector control module is used for providing control pulses for the infrared detector.
Further, the direct current bias module is used for generating various direct current bias voltages required by the infrared detector to work.
Further, the direct current bias voltage required by the work of the infrared detector is 1.6V-1.9V.
Further, the temperature control module is used for judging whether the infrared detector is in place for refrigeration according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector.
Furthermore, when the output voltage of the temperature measuring diode of the infrared detector is greater than 0.9V, the temperature is in place for refrigeration.
Further, the analog front-end module is used for buffering and amplifying an analog image signal output by the infrared detector, converting the analog image signal into an analog differential image signal, and performing A/D conversion on the analog differential image signal into a digital image signal; wherein the buffering amplification factor of the analog image signal is 1 time.
Further, the time sequence and data processing module is used for controlling the infrared detector control module to output control pulses, sequencing and reconstructing digital image signals output by the analog front end module, and outputting parallel original gray image signals, wherein the control pulses output by the infrared detector control module are 4 MHz.
Furthermore, the data transmission interface module is used for converting the parallel original gray scale image signals output by the time sequence and data processing module into LVDS digital image signals and transmitting the LVDS digital image signals to a subsequent processing circuit.
Further, the invention also provides a noise reduction method of the infrared imaging circuit, which comprises the following steps:
(1) the infrared detector control module provides control pulses for the infrared detector;
(2) the direct current bias module generates various direct current biases required by the work of the infrared detector;
(3) the temperature control module judges whether the infrared detector is in place to refrigerate according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector;
(4) the analog front-end module performs buffer amplification on an analog image signal output by the infrared detector, converts the analog image signal into an analog differential image signal, and performs A/D conversion on the analog differential image signal into a digital image signal;
(5) the time sequence and data processing module controls the infrared detector control module to output control pulses, and carries out sequencing reconstruction on digital image signals output by the analog front-end module, and outputs parallel original gray image signals;
(6) the data transmission interface module converts the parallel original gray level image signals output by the time sequence and data processing module into LVDS digital image signals and transmits the LVDS digital image signals to a subsequent processing circuit;
(7) the power supply conversion module supplies power to the modules.
The technical scheme of the invention has the following beneficial effects:
the noise reduction method of the infrared imaging circuit adopts the following key design: firstly, designing all modules in an infrared imaging circuit on a circuit board; secondly, all analog image signals in the infrared imaging circuit are transmitted inside the circuit board, and the image signals transmitted to a subsequent processing circuit by the infrared imaging circuit are converted into LVDS digital image signals; thirdly, all analog signal lines and digital signal lines of the infrared imaging circuit are separately wired; and fourthly, carrying out noise reduction treatment on the input end of the analog front end module, and increasing a feedback capacitor and a decoupling capacitor. Therefore, the noise reduction method of the infrared imaging circuit is realized, and the circuit has the advantages of simple design, low noise and high sensitivity.
Drawings
Fig. 1 is a configuration diagram of an infrared imaging circuit;
reference numerals:
1. an infrared detector control module; 2. a DC bias module; 3. a temperature control module; 4. an analog front end module; 5. a time sequence and data processing module; 6. a data transmission interface module; 7. and a power supply conversion module.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment, as shown in fig. 1, an infrared imaging circuit according to the present invention includes: the device comprises an infrared detector control module 1, a direct current bias module 2, a temperature control module 3, an analog front end module 4, a time sequence and data processing module 5, a data transmission interface module 6 and a power supply conversion module 7; wherein,
the input end of the infrared detector control module 1 is connected with the output end of the time sequence and data processing module 5, the output end of the infrared detector control module 1 is connected with an infrared detector, the output end of the direct current bias module 2 is connected with the infrared detector, the input end of the direct current bias module 2 is connected with the output end of the temperature control module 3, the input end of the temperature control module 3 is connected with the output end of a temperature measuring diode of the infrared detector, the output end of the temperature control module 3 is connected with the direct current bias module 2, the signal output end of the infrared detector is connected with the analog front end module 4, the output end of the analog front end module 4 is connected with the input end of the time sequence and data processing module 5, the output end of the time sequence and data processing module 5 is also connected with the data transmission interface module 6, and the power supply conversion module 7 is electrically connected with each module.
Further, in this embodiment, the infrared detector control module 1 is configured to provide a control pulse to the infrared detector; the direct current bias module 2 is configured to generate various direct current bias voltages required by the infrared detector, where the direct current bias voltage required by the infrared detector is 1.6V to 1.9V, and further, in this embodiment, 1.8V is preferable; the temperature control module is used for judging whether the infrared detector is in place for refrigeration according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector, the infrared detector is in place for refrigeration when the output voltage of the temperature measuring diode of the infrared detector is greater than 0.9V, and the infrared detector is in place for refrigeration when the output voltage is preferably 0.991V in the implementation method.
Further, in this embodiment, the analog front end module is configured to buffer and amplify an analog image signal output by the infrared detector, convert the analog image signal into an analog differential image signal, and perform a/D conversion on the analog differential image signal into a digital image signal; wherein the buffering amplification factor of the analog image signal is 1 time.
Further, in this embodiment, the timing and data processing module is configured to control the infrared detector control module to output a control pulse, perform sequencing reconstruction on the digital image signals output by the analog front-end module, and output a parallel original grayscale image signal, where the control pulse output by the infrared detector control module is 4 MHz.
Further, in this embodiment, the data transmission interface module is configured to convert the parallel original grayscale image signal output by the timing and data processing module into an LVDS digital image signal, and transmit the LVDS digital image signal to a subsequent processing circuit.
In addition, the invention also provides a noise reduction method of the infrared imaging circuit, which comprises the following steps:
(1) the infrared detector control module provides control pulses for the infrared detector;
(2) the direct current bias module generates various direct current biases required by the work of the infrared detector;
(3) the temperature control module judges whether the infrared detector is in place to refrigerate according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector;
(4) the analog front-end module performs buffer amplification on an analog image signal output by the infrared detector, converts the analog image signal into an analog differential image signal, and performs A/D conversion on the analog differential image signal into a digital image signal;
(5) the time sequence and data processing module controls the infrared detector control module to output control pulses, and carries out sequencing reconstruction on digital image signals output by the analog front-end module, and outputs parallel original gray image signals;
(6) the data transmission interface module converts the parallel original gray level image signals output by the time sequence and data processing module into LVDS digital image signals and transmits the LVDS digital image signals to a subsequent processing circuit;
(7) the power supply conversion module supplies power to the modules.
In the above embodiment, the control pulse provided by the infrared detector control module to the infrared detector is controlled by the timing and data processing module, and the control pulse is 4 MHz; the direct current bias voltage required by the infrared detector generated by the direct current bias module to work is 1.6V-1.9V, and further, in the embodiment, the direct current bias voltage is preferably 1.8V; the temperature control module judges whether the infrared detector is in place for refrigeration according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector, the infrared detector is in place for refrigeration when the output voltage of the temperature measuring diode of the infrared detector is greater than 0.9V, and the temperature control module is in place for refrigeration when the preferred output voltage is 0.991V in the implementation method; the analog front-end module performs buffer amplification on an analog image signal output by the infrared detector, wherein the buffer amplification factor is 1, the amplified analog image signal is converted into an analog differential image signal, and the analog differential image signal is subjected to A/D conversion and converted into a digital image signal; the time sequence and data processing module is used for controlling the infrared detector control module to output control pulses, sequencing and reconstructing digital image signals output by the analog front end module and outputting parallel original gray image signals; the data transmission interface module converts the parallel original gray level image signals output by the time sequence and data processing module into LVDS digital image signals and transmits the LVDS digital image signals to a subsequent processing circuit.
The noise reduction method of the infrared imaging circuit adopts the following key design: firstly, designing all modules in an infrared imaging circuit on a circuit board; secondly, all analog image signals in the infrared imaging circuit are transmitted inside the circuit board, and the image signals transmitted to a subsequent processing circuit by the infrared imaging circuit are converted into LVDS digital image signals; thirdly, all analog signal lines and digital signal lines of the infrared imaging circuit are separately wired; and fourthly, carrying out noise reduction treatment on the input end of the analog front end module, and increasing a feedback capacitor and a decoupling capacitor. Therefore, the noise reduction method of the infrared imaging circuit is realized, and the circuit has the advantages of simple design, low noise and high sensitivity.
It is to be understood that the above examples are illustrative only for the purpose of clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. An infrared imaging circuit, comprising: the device comprises an infrared detector control module, a direct current bias module, a temperature control module, an analog front end module, a time sequence and data processing module, a data transmission interface module and a power supply conversion module; wherein,
the input end of the infrared detector control module is connected with the output end of the time sequence and data processing module, the output end of the infrared detector control module is connected with the infrared detector, the output end of the direct current bias module is connected with the infrared detector, the input end of the direct current bias module is connected with the output end of the temperature control module, the input end of the temperature control module is connected with the output end of a temperature measuring diode of the infrared detector, the output end of the temperature control module is connected with the direct current bias module, the signal output end of the infrared detector is connected with the analog front end module, the output end of the analog front-end module is connected with the input end of the time sequence and data processing module, the output end of the time sequence and data processing module is also connected with the data transmission interface module, and the power supply conversion module is electrically connected with each module.
2. The infrared imaging circuitry of claim 1, wherein the infrared detector control module is configured to provide control pulses to the infrared detector.
3. The infrared imaging circuit as claimed in claim 2, wherein the dc bias module is configured to generate various dc bias voltages required for operation of the infrared detector.
4. The infrared imaging circuit of claim 3, wherein the dc bias voltage required for operation of the infrared detector is 1.6V to 1.9V.
5. The infrared imaging circuit of claim 3, wherein the temperature control module is configured to determine whether the infrared detector is in place according to an output of a temperature measuring diode of the infrared detector, so as to control whether the dc bias module powers on the infrared detector.
6. The infrared imaging circuit of claim 3, wherein the temperature sensing diode of the infrared detector is in place for cooling when the output voltage is greater than 0.9V.
7. The infrared imaging circuit of claim 4, wherein the analog front-end module is configured to buffer and amplify an analog image signal output by the infrared detector, convert the analog image signal into an analog differential image signal, and perform a/D conversion on the analog differential image signal into a digital image signal; wherein the buffering amplification factor of the analog image signal is 1 time.
8. The infrared imaging circuit according to any of claims 1 to 5, wherein the timing and data processing module is configured to control the infrared detector control module to output a control pulse, perform sequencing reconstruction on the digital image signals output by the analog front-end module, and output a parallel original gray image signal, wherein the control pulse output by the infrared detector control module is 4 MHz.
9. The infrared imaging circuit according to any one of claims 1 to 6, wherein the data transmission interface module is configured to convert the parallel original grayscale image signals output by the timing and data processing module into LVDS digital image signals, and transmit the LVDS digital image signals to a subsequent processing circuit.
10. A noise reduction method for an infrared imaging circuit according to any one of claims 1 to 7, characterized by comprising the steps of:
(1) the infrared detector control module provides control pulses for the infrared detector;
(2) the direct current bias module generates various direct current biases required by the work of the infrared detector;
(3) the temperature control module judges whether the infrared detector is in place to refrigerate according to the output of the temperature measuring diode of the infrared detector so as to control whether the direct current bias module powers on the infrared detector;
(4) the analog front-end module performs buffer amplification on an analog image signal output by the infrared detector, converts the analog image signal into an analog differential image signal, and performs A/D conversion on the analog differential image signal into a digital image signal;
(5) the time sequence and data processing module controls the infrared detector control module to output control pulses, and carries out sequencing reconstruction on digital image signals output by the analog front-end module, and outputs parallel original gray image signals;
(6) the data transmission interface module converts the parallel original gray level image signals output by the time sequence and data processing module into LVDS digital image signals and transmits the LVDS digital image signals to a subsequent processing circuit;
(7) the power supply conversion module supplies power to the modules.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811088511.8A CN109374138A (en) | 2018-09-18 | 2018-09-18 | A kind of infrared imaging circuit and noise-reduction method |
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| CN201811088511.8A CN109374138A (en) | 2018-09-18 | 2018-09-18 | A kind of infrared imaging circuit and noise-reduction method |
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Citations (7)
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| CN2663956Y (en) * | 2003-12-24 | 2004-12-15 | 中国科学院上海技术物理研究所 | Thermoelectric refrigeration type infrared detector assembly |
| CN101242495A (en) * | 2007-02-07 | 2008-08-13 | 南京理工大学 | Self-adapted digitalization method and its circuit for infrared plane array |
| CN101957982A (en) * | 2010-10-11 | 2011-01-26 | 华中科技大学 | Real-time infrared image processing system suitable for high frame rate and large array infrared detector |
| CN102353458A (en) * | 2011-07-08 | 2012-02-15 | 凯迈（洛阳）测控有限公司 | Temperature signal acquisition circuit and application thereof, and infrared detector |
| CN204758132U (en) * | 2014-12-26 | 2015-11-11 | 国网浙江省电力公司嘉兴供电公司 | Infrared detection achievement of integration station |
| CN107197175A (en) * | 2017-05-31 | 2017-09-22 | 北京空间机电研究所 | A kind of high rail level battle array stares infrared camera imaging circuit system |
| CN108106733A (en) * | 2016-11-24 | 2018-06-01 | 北京遥感设备研究所 | A kind of low noise infrared imaging circuit |
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2018
- 2018-09-18 CN CN201811088511.8A patent/CN109374138A/en active Pending
Patent Citations (7)
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| CN2663956Y (en) * | 2003-12-24 | 2004-12-15 | 中国科学院上海技术物理研究所 | Thermoelectric refrigeration type infrared detector assembly |
| CN101242495A (en) * | 2007-02-07 | 2008-08-13 | 南京理工大学 | Self-adapted digitalization method and its circuit for infrared plane array |
| CN101957982A (en) * | 2010-10-11 | 2011-01-26 | 华中科技大学 | Real-time infrared image processing system suitable for high frame rate and large array infrared detector |
| CN102353458A (en) * | 2011-07-08 | 2012-02-15 | 凯迈（洛阳）测控有限公司 | Temperature signal acquisition circuit and application thereof, and infrared detector |
| CN204758132U (en) * | 2014-12-26 | 2015-11-11 | 国网浙江省电力公司嘉兴供电公司 | Infrared detection achievement of integration station |
| CN108106733A (en) * | 2016-11-24 | 2018-06-01 | 北京遥感设备研究所 | A kind of low noise infrared imaging circuit |
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Application publication date: 20190222 |