CN102338664A - Real-time background deduction method for target radiometry - Google Patents
Real-time background deduction method for target radiometry Download PDFInfo
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- CN102338664A CN102338664A CN201010238090XA CN201010238090A CN102338664A CN 102338664 A CN102338664 A CN 102338664A CN 201010238090X A CN201010238090X A CN 201010238090XA CN 201010238090 A CN201010238090 A CN 201010238090A CN 102338664 A CN102338664 A CN 102338664A
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Abstract
The invention discloses a real-time background deduction method for target radiometry. A target, a background, an optical system, a scanning vibration lens, a first photoelectric detector, a second photoelectric detector, a signal processing system and a computer are used for achieving the real-time deduction method, wherein the optical system is used for imaging the target; when the scanning vibration lens vibrates, the target is imaged on the first photoelectric detector and the second photoelectric detector in turn; when the target is imaged on the first photoelectric detector, the background is imaged on the second photoelectric detector; when the target is imaged on the second photoelectric detector, the background is imaged on the first photoelectric detector; and the signal processing system is used for subtracting the signals of the first photoelectric detector and the second photoelectric detector in real time, thereby efficiently eliminating the influence of the background on the target radiometry in real time and acquiring an accurate target radiometry value. Compared with an afterward background deduction method, the real-time background deduction method for the target radiometry provided by the invention has the advantages that the instantaneity is better and the change of target radiation intensity can be reflected in real time.
Description
Technical field
The present invention relates to a kind of measuring technique, particularly relate to a kind of target radiation measurement background method of deduction in real time.
Background technology
The radiation characteristic of target is the significant data that characterizes target, accurately measures significant to it.One of difficulty of target emanation feature measurement is the existence of background radiation.The existence of background radiation can influence the accuracy of target radiation measurement.Especially to the low signal-to-noise ratio target, the intensity of background radiation even be far longer than the signal intensity of target itself, it is impossible that the actinometry that makes target is almost become.Therefore, the deduction of background radiation has just become one of gordian technique that target radiation measurement must solve.
For the deduction of background radiation, the approach that in the past solved is the method for afterwards deducting, if but altering a great deal of background will influence the precision of target radiation measurement.Especially under the little target conditions of overall background, the slight change of background or instability all can affect greatly measurement result, and cause the inaccurate of target radiation measurement.Another defective of the method for background deduction afterwards that target radiation measurement adopts is that real-time is poor, can not be in time the deduction of background radiation be fallen, thereby can not reflect the variation of target emanation intensity in real time.
Summary of the invention
The technical matters that the present invention will solve is in order to overcome the defective of prior art; A kind of actinometry background method of deduction in real time of marking is provided; It is in target radiation measurement, even change of background is very big, adopts the real-time subtraction method of background still can background radiation be deducted; Extract the numerical value of target emanation, and have degree of precision.
The present invention solves above-mentioned technical matters through following technical proposals: a kind of target radiation measurement background is the method for deduction in real time; It is characterized in that; This method is accomplished through target, background, optical system, scanning galvanometer, first photodetector, second photodetector, signal processing system and computing machine, and optical system is to target imaging, when scanning galvanometer is done vibration; Target forms images on first photodetector and second photodetector successively; When target formed images on first photodetector, to background imaging, target was on second photodetector time on second photodetector; On first photodetector background is formed images; Through signal processing system the signal in real time of first photodetector and second photodetector is subtracted each other, background correction obtains the value of accurate target emanation to the influence of target radiation measurement effectively in real time.
Preferably; Said first photodetector is connected first prime amplifier and second prime amplifier respectively with second photodetector; The simulating signal of first photodetector and second photodetector difference measurement target and independent background; Simulating signal reaches required level after amplifying through first prime amplifier and second prime amplifier, and first prime amplifier is connected with a differential amplifier with second prime amplifier, and differential amplifier subtracts each other the two-way simulating signal; Background radiation signal deduction back is obtained echo signal; Differential amplifier is connected with a rectification circuit, through rectification circuit the echo signal voltage transitions is become unipolar echo signal voltage, and rectification circuit is connected with a filtering circuit; Make echo signal voltage directly characterize the numerical value of target emanation amount through filtering circuit again, the numerical value of the target emanation amount that echo signal voltage characterizes is input to computing machine through a data acquisition system (DAS) and carries out analyzing and processing.
What preferably, said first photodetector and second photodetector adopted is ten element array detectors of Si-Pin photodiode plane and the anti-reflection technology of antireflection.
Preferably; Said first prime amplifier and second prime amplifier adopt the two-stage amplifying circuit; First order amplifying circuit adopts the instrumentation amplifier of the BiMOS technology of high input impedance, high cmrr to constitute electric current one voltage changer, and current signal is transformed to voltage signal; The voltage signal that second level amplifying circuit adopts the accurate instrumentation amplifier of low noise that prime is sent into amplifies once more.
Preferably, said differential amplifier is that accurate appearance is with AD620 type differential amplifier.
Preferably, said rectification circuit is the all-wave precise rectification circuit.
Preferably, said filtering circuit is for being second order voltage controlled voltage source low-pass filter.
Positive progressive effect of the present invention is: what the real-time subtraction method of background of the present invention was deducted is the background of synchronization, irrelevant with the variable quantity size of background.The real-time background deduction method that target radiation measurement of the present invention adopts is compared with background deduction method afterwards has good real-time performance, and the influence of background correction radiation in real time reflects the variation of target emanation intensity in real time.
Description of drawings
Fig. 1 is the principle of work synoptic diagram of the real-time subtraction method of target radiation measurement background of the present invention.
Fig. 2 is the experimental program synoptic diagram of the real-time subtraction method of target radiation measurement background of the present invention.
Fig. 3 is signal processing flow figure.
Fig. 4 is the circuit theory diagrams of prime amplifier.
Fig. 5 is the circuit theory diagrams of differential amplifier.
Fig. 6 is an all-wave precise rectification circuit schematic diagram.
Fig. 7 is the schematic diagram of second order voltage controlled voltage source low-pass filter circuit.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to specify technical scheme of the present invention.
As shown in Figure 1, a kind of target radiation measurement background is the method for deduction in real time, and it is accomplished through target, background, optical system, scanning galvanometer, first photodetector, second photodetector, signal processing system and computing machine.Optical system is to target imaging, between optical system and first photodetector, second photodetector, adds a scanning galvanometer, on the optical system focal plane, places two unit light electric explorers.When scanning galvanometer was done vibration, target formed images on first photodetector and second photodetector successively.If target is when forming images on first photodetector, on second photodetector to the background imaging, otherwise target is on second photodetector time, background is just on first photodetector.Since two photodetectors lean on very nearly (spacing has only 40 μ m), and target is approximate infinity, so can think that background is identical on these two photodetectors.Through signal processing system two photo detector signal are subtracted each other in real time, can be in real time effectively background correction the influence of target radiation measurement is obtained the value of accurate target emanation.
As shown in Figure 2; The light that target light source is sent is to form point target behind the pin hole of 0.2mm through diameter; The light that point target is sent becomes parallel beam after the optical alignment system; Then reflect to imaging optical system, assemble, on first photodetector and second photodetector, form the target picture point at last through imaging optical system by scanning galvanometer.Background light source forms uniform background radiation through frosted glass on photodetector, the radiant light power of background and target can both be controlled respectively.Scanning galvanometer in the experiment light path with some cycles modulation echo signal, drops on two photodetectors the picture of point target respectively.Scanning galvanometer is by computer control, and computing machine produces the voltage that requires waveform through waveform generator, and this voltage is given scanning galvanometer servo-drive circuit again, realizes the accurate vibration of scanning galvanometer.First photodetector and second photodetector receiving target and the background signal carry out signal Processing through signal processing circuit, and the influence of background correction radiation in real time extracts the numerical value of target emanation amount, imports computing machine again and carries out analyzing and processing.
Signal processing flow is as shown in Figure 3 in the embodiment of the invention; Needs first photodetector and second photodetector according to signal Processing are connected with first prime amplifier and second prime amplifier respectively, the measurement target (containing background) and the simulating signal of background respectively separately.From the simulating signal of destination channel and background passage, through reaching required level after first prime amplifier and the amplification of second prime amplifier.First prime amplifier is connected with a differential amplifier with second prime amplifier, and differential amplifier subtracts each other the two-way simulating signal, and the background radiation signal deduction with very strong obtains simple echo signal.Differential amplifier is connected with a rectification circuit; Become unipolar echo signal voltage to the echo signal voltage transitions of positive and negative alternation through rectification circuit; Rectification circuit is connected with a low pass active filter circuit, makes echo signal voltage can directly characterize the numerical value of target emanation amount through the low pass active filter circuit again.At last, the numerical value of the target emanation amount that characterizes of echo signal voltage is input to computing machine through data acquisition system (DAS) and carries out analyzing and processing.
What first photodetector in the signal processing system of the present invention and second photodetector adopted is ten element array detectors of Si-Pin photodiode plane and the anti-reflection technology of antireflection; Wherein two adjacent probe units have only been used among the embodiment; Because detector is that the light signal that receives is become proportional with it current signal; But the current signal of output is extremely small; Therefore need pre-amplification circuit of serial connection that small current signal is transformed into voltage signal, and pre-amplification circuit must Gain Adjustable.The circuit of first and second prime amplifiers is as shown in Figure 4; First prime amplifier and second prime amplifier adopt the two-stage amplifying circuit; First order amplifying circuit adopts the instrument CA3140 type amplifier of the BiMOS technology of high input impedance, high cmrr to constitute electric current one voltage changer, and faint current signal is transformed to voltage signal; The voltage signal that second level amplifying circuit adopts the accurate appearance of low noise with OP-07 type amplifier prime to be sent into amplifies once more.R wherein
2Be zero potentiometer, be used for the zero-bit of regulating circuit; R
5Be the gain-adjusted potentiometer, be used for the gain of regulating circuit.
The differential amplifier that adopts in the signal processing system of the present invention be accurate appearance with AD620 type differential amplifier, its circuit is as shown in Figure 5.Compare with three amplifier differential amplifier circuits, in the three amplifier differential amplifier circuits, the error of resistance and temperature are floated and can be caused the reduction inaccurate and common-mode rejection ratio that gains; In addition, the input offset voltage of integrated transporting discharging can cause the imbalance of whole differential amplifier circuit, and the parameter symmetry and the common-mode rejection ratio of step-down amplifier.AD620 type differential amplifier adopts the high precision built-in resistor, has the advantages that volume is little, low in energy consumption, precision is high, noise is low and input bias current is low.Any gain of AD620 type differential amplifier in outer meeting resistance can be realized 1～1000 scope.Therefore, background adopts AD620 type differential amplifier to realize the difference amplification in the deduction system in real time.
What rectification circuit adopted in the signal processing system of the present invention is the all-wave precise rectification circuit, and its circuit is as shown in Figure 6.Diode with unilateral conduction is the rectifier cell of using always, but the non-linear of diode will produce sizable error, and when signal amplitude during less than the dead band voltage of diode, problem is particularly serious especially, and the rectification circuit precision that therefore is made up of diode is low.In order to improve precision, all-wave precise rectification circuit of the present invention utilizes the amplification of integrated transporting discharging and degree of depth negative feedback to overcome the non-linear error that causes with forward conduction voltage drop of diode.
The filtering circuit that adopts in the signal processing system of the present invention is a second order voltage controlled voltage source low-pass filter, and its circuit is as shown in Figure 7.The relative passive filter of active filter has without advantage such as inductance, volume be little, in light weight.The open-loop voltage gain of integrated transporting discharging and input impedance are all very high, and output resistance is little, also have certain voltage amplification and buffering effect after constituting power filter.
In order to verify the effect of the embodiment of the invention, respectively following two kinds of situation are studied: the one, change of background, the situation that target is constant; The 2nd, object variations, the situation that background is constant.In change of background; Under the constant situation of target; Taper under 208.63 the condition from 36.61 at the ratio of background and echo signal; Method based on the target radiation measurement background of scanning galvanometer is deducted in real time can be deducted very strong background radiation, extract accurate echo signal, and relative error is within ± 0.5%.In object variations; Under the constant situation of background; The ratio of background and echo signal tapers at 5.53 o'clock from 170.79, and this real-time background deduction method still can be deducted stronger background radiation, extracts the echo signal that is buried in the background; And reflecting the variable quantity of echo signal in real time, relative error is within ± 1%.Visible through above-mentioned experiment, this target radiation measurement background is deducted the method for technology in real time, can the faint echo signal extract real-time that be buried in the strong background radiation be come out, and has higher feasibility.
Though more than described embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these embodiments.Therefore, protection scope of the present invention is limited appended claims.
Claims (7)
1. the method that the target radiation measurement background is deducted in real time is characterized in that this method is accomplished through target, background, optical system, scanning galvanometer, first photodetector, second photodetector, signal processing system and computing machine; Optical system is to target imaging; When scanning galvanometer was done vibration, target formed images on first photodetector and second photodetector successively, when target forms images on first photodetector; On second photodetector background is formed images; Target to the background imaging, is subtracted each other the signal in real time of first photodetector and second photodetector through signal processing system on first photodetector on second photodetector time; Background correction obtains the value of accurate target emanation to the influence of target radiation measurement effectively in real time.
2. target radiation measurement background as claimed in claim 1 is the method for deduction in real time; It is characterized in that; Said first photodetector is connected first prime amplifier and second prime amplifier respectively with second photodetector; The simulating signal of first photodetector and second photodetector difference measurement target and independent background; Simulating signal reaches required level after amplifying through first prime amplifier and second prime amplifier, and first prime amplifier is connected with a differential amplifier with second prime amplifier, and differential amplifier subtracts each other the two-way simulating signal; Background radiation signal deduction back is obtained echo signal; Differential amplifier is connected with a rectification circuit, through rectification circuit the echo signal voltage transitions is become unipolar echo signal voltage, and rectification circuit is connected with a filtering circuit; Make echo signal voltage directly characterize the numerical value of target emanation amount through filtering circuit again, the numerical value of the target emanation amount that echo signal voltage characterizes is input to computing machine through a data acquisition system (DAS) and carries out analyzing and processing.
3. target radiation measurement background as claimed in claim 2 is the method for deduction in real time, it is characterized in that, what said first photodetector and second photodetector adopted is ten element array detectors of Si-Pin photodiode plane and the anti-reflection technology of antireflection.
4. target radiation measurement background as claimed in claim 2 is the method for deduction in real time; It is characterized in that; Said first prime amplifier and second prime amplifier adopt the two-stage amplifying circuit; First order amplifying circuit adopts the instrumentation amplifier of the BiMOS technology of high input impedance, high cmrr to constitute electric current one voltage changer, and current signal is transformed to voltage signal; The voltage signal that second level amplifying circuit adopts the accurate instrumentation amplifier of low noise that prime is sent into amplifies once more.
5. target radiation measurement background as claimed in claim 2 is the method for deduction in real time, it is characterized in that said differential amplifier is that accurate appearance is with AD620 type differential amplifier.
6. target radiation measurement background as claimed in claim 2 is the method for deduction in real time, it is characterized in that said rectification circuit is the all-wave precise rectification circuit.
7. target radiation measurement background as claimed in claim 2 is the method for deduction in real time, it is characterized in that said filtering circuit is for being second order voltage controlled voltage source low-pass filter.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106716089A (en) * | 2014-09-29 | 2017-05-24 | 富士胶片株式会社 | Infrared image acquisition device and infrared image acquisition method |
| CN108844634A (en) * | 2018-07-10 | 2018-11-20 | 张洋 | Color identification method |
| CN108896184A (en) * | 2018-07-10 | 2018-11-27 | 张洋 | Color identification method |
| CN109327259A (en) * | 2018-11-15 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of double detector visible light communication noise-reduction method and system |
| CN112068064A (en) * | 2020-09-18 | 2020-12-11 | 国网重庆市电力公司营销服务中心 | Running three-phase voltage transformer error calculation method with background influence quantity deducted |
| CN113820689A (en) * | 2020-06-18 | 2021-12-21 | 华为技术有限公司 | Receiver, laser ranging device and point cloud image generation method |
| CN117405626A (en) * | 2023-12-13 | 2024-01-16 | 合肥金星智控科技股份有限公司 | Mid-infrared TDLAS infrared radiation background subtraction device and method and acquisition system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106716089A (en) * | 2014-09-29 | 2017-05-24 | 富士胶片株式会社 | Infrared image acquisition device and infrared image acquisition method |
| CN108844634A (en) * | 2018-07-10 | 2018-11-20 | 张洋 | Color identification method |
| CN108896184A (en) * | 2018-07-10 | 2018-11-27 | 张洋 | Color identification method |
| CN109327259A (en) * | 2018-11-15 | 2019-02-12 | 中国科学院西安光学精密机械研究所 | A kind of double detector visible light communication noise-reduction method and system |
| CN113820689A (en) * | 2020-06-18 | 2021-12-21 | 华为技术有限公司 | Receiver, laser ranging device and point cloud image generation method |
| CN113820689B (en) * | 2020-06-18 | 2024-05-17 | 华为技术有限公司 | Receiver, laser ranging equipment and point cloud image generation method |
| CN112068064A (en) * | 2020-09-18 | 2020-12-11 | 国网重庆市电力公司营销服务中心 | Running three-phase voltage transformer error calculation method with background influence quantity deducted |
| CN112068064B (en) * | 2020-09-18 | 2023-08-25 | 国网重庆市电力公司营销服务中心 | Method for calculating errors of operation three-phase voltage transformer with background influence subtracted |
| CN117405626A (en) * | 2023-12-13 | 2024-01-16 | 合肥金星智控科技股份有限公司 | Mid-infrared TDLAS infrared radiation background subtraction device and method and acquisition system |
| CN117405626B (en) * | 2023-12-13 | 2024-04-02 | 合肥金星智控科技股份有限公司 | Mid-infrared TDLAS infrared radiation background subtraction device and method and acquisition system |
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Application publication date: 20120201 |