CN104266766A - Infrared thermal imaging system - Google Patents
Infrared thermal imaging system Download PDFInfo
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- CN104266766A CN104266766A CN201410475638.0A CN201410475638A CN104266766A CN 104266766 A CN104266766 A CN 104266766A CN 201410475638 A CN201410475638 A CN 201410475638A CN 104266766 A CN104266766 A CN 104266766A
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- 238000001931 thermography Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000012546 transfer Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 8
- 230000036541 health Effects 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000003331 infrared imaging Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
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- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The embodiment of the invention discloses an infrared thermal imaging system, which comprises: an infrared detector; the impedance conversion circuit is used for buffering the output signal of the infrared detector and changing the impedance characteristic of the output signal; the single-end-to-differential conversion circuit is used for performing single-end-to-differential conversion on the output signal and conditioning the differential signal so as to enable the differential signal to adapt to the dynamic range of the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is used for converting the differential signal into a digital signal; and a timing control and data processing circuit for controlling the timing of the analog-to-digital conversion circuit and performing signal processing on the digital signal. The infrared thermal imaging system provided by the embodiment of the invention has good low-noise and low-power consumption performances.
Description
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Technical field
The present invention relates to infrared imagery technique field, especially relate to a kind of infra-red thermal imaging system.
Background technology
Infrared thermal imaging technique is a kind of by using infrared imaging measuring instrument " to check " or the technology of " measurement " object radiation heat energy.Infrared ray because of wavelength long, cannot by Human Perception.But, in the infrared world, as long as the temperature of object will outside radiations heat energy more than absolute zero.Therefore, we can carry out imaging by detecting its temperature.
It is strong that infrared thermal imaging technique has adaptive capacity to environment, works good under night and inclement weather; Good concealment, antijamming capability is strong; The camouflaged target of identifiable design visible ray None-identified; The volume of infrared imaging system is little, lightweight, low in energy consumption, reliability is high, can be applicable to the advantages such as precision guided weapon, is the important support technology building national defense safety system, has huge application prospect in military and civilian field.Device most crucial in infrared imaging system is infrared eye, and consider in the angle of electronics design, improve the image quality of whole infrared imaging system except selecting high performance detector, design low noise high-quality infrared eye signal processing circuit is very crucial.
Summary of the invention
An object of the present invention is to provide the infra-red thermal imaging system of a kind of low noise, low-power consumption.
Technical scheme disclosed by the invention comprises:
Provide a kind of infra-red thermal imaging system, it is characterized in that, comprising: infrared eye; Impedance inverter circuit, described impedance inverter circuit is connected to described infrared eye, for cushioning the output signal of described infrared eye and changing the impedance operator of described output signal; Single-ended transfer difference circuit, described single-ended transfer difference circuit is connected to described impedance inverter circuit, for carrying out single-ended transfer difference to described output signal, generates differential signal, and nurse one's health described differential signal, make described differential signal adapt to the dynamic range of analog to digital conversion circuit; Analog to digital conversion circuit, analog-digital conversion circuit as described is connected to described differential amplifier circuit, for converting described differential signal to digital signal; Sequential control and data processing circuit, described sequential control and data processing circuit are connected to analog-digital conversion circuit as described, for controlling the sequential of analog-digital conversion circuit as described and performing signal transacting to described digital signal.
In one embodiment of the present of invention, described impedance inverter circuit comprises RC filtering circuit and voltage follower, and described RC filtering circuit is connected to the in-phase input end of described voltage follower.
In one embodiment of the present of invention, described single-ended transfer difference circuit is realized by Full differential operational amplifier.
In one embodiment of the present of invention, analog-digital conversion circuit as described comprises the analog to digital converter of Differential Input.
In one embodiment of the present of invention, described signal transacting comprises: blind element compensation, a point calibration and/or gray scale stretch.
The infra-red thermal imaging system that embodiments of the invention provide, has good low noise, low power capabilities.
Accompanying drawing explanation
Fig. 1 is the structured flowchart schematic diagram of the infra-red thermal imaging system of one embodiment of the invention.
Fig. 2 is the structural representation of the impedance inverter circuit of one embodiment of the invention.
Fig. 3 is the single-ended transfer difference circuit of one embodiment of the invention and the structural representation of analog to digital conversion circuit.
Embodiment
The concrete structure of the infra-red thermal imaging system of embodiments of the invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the structured flowchart schematic diagram of the infra-red thermal imaging system of one embodiment of the invention.
In one embodiment of the invention, a kind of infra-red thermal imaging system comprises infrared eye (not shown in figure 1).Infrared eye can detection imaging target heat radiation and produce output signal Vo.
As shown in Figure 1, in one embodiment of the present of invention, infra-red thermal imaging system also comprises impedance inverter circuit 10, single-ended transfer difference circuit 12, analog to digital conversion circuit 14 and sequential control and data processing circuit 16.
Impedance inverter circuit 10 is connected to infrared eye, for cushioning the output signal Vo of infrared eye and changing the impedance operator of this output signal Vo so that subsequent conditioning circuit is to the process of this output signal.In Fig. 1, the signal after impedance inverter circuit 10 processes is expressed as V1.
In one embodiment of the present of invention, as shown in Figure 2, it comprises RC filtering circuit 102 and voltage follower 100, RC filtering circuit 102 is connected on the in-phase input end of voltage follower 100 for the structure of impedance inverter circuit 10.
In the embodiment of Fig. 2, this RC filtering circuit 102 is single order RC filtering circuit.
In one embodiment of the present of invention, single-ended transfer difference circuit can be realized by Full differential operational amplifier.
As shown in Figure 1, single-ended transfer difference circuit 12 is connected to impedance inverter circuit 10, for to the output signal processed through impedance inverter circuit 10 (namely, V1) single-ended transfer difference is carried out, generate differential signal (CH+ and CH-in Fig. 1), and nurse one's health this differential signal, make this differential signal CH+ and CH-adapt to the dynamic range of follow-up analog to digital conversion circuit 14.The common mode signal voltage value that Full differential operational amplifier exports is by V
cMvoltage determines, V
cMpin is connected with the reference voltage central point VCM of analog to digital converter.
Analog to digital conversion circuit 14 is connected to single-ended transfer difference circuit 12, for converting differential signal to digital signal.
In one embodiment of the present of invention, analog to digital conversion circuit 14 can comprise the analog to digital converter of Differential Input, is namely realized by the analog to digital converter of Differential Input.
In one embodiment of the present of invention, the structure of single-ended transfer difference circuit 12 and analog to digital conversion circuit 14 as shown in Figure 3.In the present embodiment, single-ended transfer difference circuit 12 adopts low noise, low distortion, super low-power consumption amplifier ADA4940-1.Analog to digital converter is AD9649-20, and the maximum sampling rate of this chip is 20MHz, meets the requirement that detector exports highest frequency 5MHz, input voltage range 0 ~ 2V.The anode input voltage range of difference amplifier is 0.5V ~ 3.2V, negative terminal input 2.5V.For this difference amplifier, Differential Input V
p-p=2.7V.Because this amplifier gain is 0.5, then difference output V
p-p=1.35V, output common mode voltage is 1V with the equal of rear end ADC, then difference output scope is (1-1.35/2) V ~ (1+1.35/2) V, i.e. 0.325V ~ 1.675V, meets 0V ~ 2V differential input voltage scope of AD9649.
As shown in Figure 1, sequential control and data processing circuit 16 are connected to analog to digital conversion circuit 14.Sequential control and data processing circuit 16 produce the timing control signal of analog to digital conversion circuit 14, for controlling the sequential of analog to digital conversion circuit, in addition, sequential control and data processing circuit 16 also perform the signal transacting to digital signal, such as, perform the blind element of digital signal is compensated, the process such as a point calibration and/or gray scale stretching.
In embodiments of the invention, sequential control and data processing circuit 16 can be realized by FPGA or be realized by other logical devices be applicable to.
The infra-red thermal imaging system that embodiments of the invention provide, has good low noise, low power capabilities.
Described the present invention by specific embodiment above, but the present invention is not limited to these specific embodiments.It will be understood by those skilled in the art that and can also make various amendment, equivalent replacement, change etc. to the present invention, as long as these conversion do not deviate from spirit of the present invention, all should within protection scope of the present invention.In addition, " embodiment " described in above many places represents different embodiments, can certainly by its all or part of combination in one embodiment.
Claims (5)
1. an infra-red thermal imaging system, is characterized in that, comprising:
Infrared eye;
Impedance inverter circuit, described impedance inverter circuit is connected to described infrared eye, for cushioning the output signal of described infrared eye and changing the impedance operator of described output signal;
Single-ended transfer difference circuit, described single-ended transfer difference circuit is connected to described impedance inverter circuit, for carrying out single-ended transfer difference to described output signal, generates differential signal, and nurse one's health described differential signal, make described differential signal adapt to the dynamic range of analog to digital conversion circuit;
Analog to digital conversion circuit, analog-digital conversion circuit as described is connected to described single-ended transfer difference circuit, for converting described differential signal to digital signal;
Sequential control and data processing circuit, described sequential control and data processing circuit are connected to analog-digital conversion circuit as described, for controlling the sequential of analog-digital conversion circuit as described and performing signal transacting to described digital signal.
2. the system as claimed in claim 1, is characterized in that: described impedance inverter circuit comprises RC filtering circuit and voltage follower, and described RC filtering circuit is connected to the in-phase input end of described voltage follower.
3. system as described in claim 1 or 2, is characterized in that: described single-ended transfer difference circuit is realized by Full differential operational amplifier.
4. as the system in claims 1 to 3 as described in any one, it is characterized in that: analog-digital conversion circuit as described comprises the analog to digital converter of Differential Input.
5. the system as claimed in claim 1, is characterized in that, described signal transacting comprises: blind element compensation, a point calibration and/or gray scale stretch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475638.0A CN104266766A (en) | 2014-09-18 | 2014-09-18 | Infrared thermal imaging system |
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| CN201410475638.0A CN104266766A (en) | 2014-09-18 | 2014-09-18 | Infrared thermal imaging system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748858A (en) * | 2015-03-18 | 2015-07-01 | 北京空间机电研究所 | InGaAs shortwave infrared detector signal processing system |
| CN110044492A (en) * | 2019-05-24 | 2019-07-23 | 哈工大机器人（山东）智能装备研究院 | Calculus of differences amplifying circuit and image processing system for image processing system |
| CN111257273A (en) * | 2020-03-18 | 2020-06-09 | 长沙开元仪器有限公司 | Coal quality analyzer and coal quality detection circuit thereof |
| CN112910465A (en) * | 2021-01-14 | 2021-06-04 | 苏州迅芯微电子有限公司 | High-speed and high-bandwidth signal conversion method and analog-to-digital converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102865927A (en) * | 2012-09-07 | 2013-01-09 | 北京空间机电研究所 | TDI (Transport Driver Interface) infrared detector signal processing system based on alternating-current coupling |
| CN203618083U (en) * | 2013-06-17 | 2014-05-28 | 中国航天科工集团第三研究院第八三五八研究所 | Long-distance transmission device for infrared digital image |
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2014
- 2014-09-18 CN CN201410475638.0A patent/CN104266766A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865927A (en) * | 2012-09-07 | 2013-01-09 | 北京空间机电研究所 | TDI (Transport Driver Interface) infrared detector signal processing system based on alternating-current coupling |
| CN203618083U (en) * | 2013-06-17 | 2014-05-28 | 中国航天科工集团第三研究院第八三五八研究所 | Long-distance transmission device for infrared digital image |
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| 吕坚 等: "一种新型低噪声高均匀性红外焦平面读出电路", 《微电子学》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748858A (en) * | 2015-03-18 | 2015-07-01 | 北京空间机电研究所 | InGaAs shortwave infrared detector signal processing system |
| CN104748858B (en) * | 2015-03-18 | 2017-07-28 | 北京空间机电研究所 | A kind of InGaAs short-wave infrareds detector signal processing system |
| CN110044492A (en) * | 2019-05-24 | 2019-07-23 | 哈工大机器人（山东）智能装备研究院 | Calculus of differences amplifying circuit and image processing system for image processing system |
| CN111257273A (en) * | 2020-03-18 | 2020-06-09 | 长沙开元仪器有限公司 | Coal quality analyzer and coal quality detection circuit thereof |
| CN112910465A (en) * | 2021-01-14 | 2021-06-04 | 苏州迅芯微电子有限公司 | High-speed and high-bandwidth signal conversion method and analog-to-digital converter |
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