CN106225919A - Distributed luminosity measuring method based on lock-in amplifier and the system of measurement - Google Patents
Distributed luminosity measuring method based on lock-in amplifier and the system of measurement Download PDFInfo
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- CN106225919A CN106225919A CN201610620370.4A CN201610620370A CN106225919A CN 106225919 A CN106225919 A CN 106225919A CN 201610620370 A CN201610620370 A CN 201610620370A CN 106225919 A CN106225919 A CN 106225919A
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- chopper
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 230000005622 photoelectricity Effects 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013102 re-test Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 206010002368 Anger Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- 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
- 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
- G01J1/02—Details
- G01J1/0295—Constructional arrangements for removing other types of optical noise or for performing calibration
-
- 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
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present invention relates to distributed luminosity measuring method based on lock-in amplifier and measurement system.The measuring method that purpose is to provide should be able to cancelling noise signal disturbing, it is provided that measurement system there is the feature of simple in construction.Technical scheme is: distributed luminosity measuring method based on lock-in amplifier, sequentially includes the following steps: 1) place chopper；2) photodetector is connected to lock-in amplifier；3) lock-in amplifier is connected to computer；4) sample is placed in distribution photometer station to be measured to fix；5) equipment is made to enter duty；6) distribution photometer main axis；7) from noise, faint optical signal is detected；8) distribution photometer is by controlling double freedom turntable real-time motion；9) luminous flux is calculated.Distributed luminosity based on lock-in amplifier measures system, including distribution photometer main frame, photodetector and computer；The front end of photodetector is furnished with chopper, and chopper is connected to manipulator, and system is also configured with lock-in amplifier.
Description
Technical field
The present invention relates to a kind of measuring method and system, especially distributed luminosity measuring method and the system of measurement.
Background technology
Distribution photometer is to test various light fixtures, the capital equipment of light source intensity distribution.This equipment passes through swing arm and sample
Synchronous axial system, is received the luminous intensity of measured light different directions, is calculated light intensity spatial distribution by photodetector pointwise
Data.But existing distribution photometer is when measuring light intensity data, the photodetector of use is to the linear response of light intensity
Defect；Especially switching rapidly and when noise jamming at micrometer weak light source, strong and weak light, uncertainty of measurement is very big, light intensity
Data easily produce Systematic Errors.This is the key factor affecting luminous intensity distribution measurement accuracy at present.
Summary of the invention
It is an object of the invention to overcome the deficiency of above-mentioned background technology, it is provided that a kind of distributed luminosity based on lock-in amplifier
Measuring method and the system of measurement；The measuring method provided should be able to reject the noise signal interference of non-correlation, thus at noise
In signal, accurately pickup detects faint measured signal, and the measurement system provided also has simple in construction, practical feature.
Present invention provide the technical scheme that
Distributed luminosity measuring method based on lock-in amplifier, sequentially includes the following steps:
1) placing chopper in photodetector front end, chopper is connected to manipulator, and manipulator reconnects phase-locked amplification
Device；Wherein manipulator controls the operating frequency of chopper according to test needs, regulation, and as frequency signal, inputs to lock
The reference signal end of phase amplifier；
2) photodetector outfan is connected to the test signal input part of lock-in amplifier, lock-in amplifier is exported
Measured signal；
3) signal output part of lock-in amplifier is connected to computer, receives light intensity data for computer；
4) sample (light fixture or light source) is placed in distribution photometer station to be measured to fix, and connects power line；
5) give computer, distribution photometer host supplying power, light measured light；To photodetector, lock-in amplifier, cut
Light device is powered, and makes equipment enter duty；
6) distribution photometer main axis, light measured light a direction sent by the reflecting mirror of distribution photometer
Reflex to be received by photodetector again after chopper accepts modulation, then export as measured signal；Lock-in amplifier is simultaneously
Receive the reference frequency signal coming from chopper and manipulator, and as lock-in amplifier computing reference signal；With reference to letter
Number and measured signal be input simultaneously in lock-in amplifier, computer by software collection lock-in amplifier obtain and computing after
Photosignal record；
7) lock-in amplifier is by the Integral Processing that is multiplied reference signal x (t), measured signal y (t), suppression
The noise of photodetector, makes faint optical signal detect from noise；
8) distribution photometer is by controlling double freedom turntable real-time motion, is not forfeited by the light that light source different directions sends
In photodetector, obtained by lock-in amplifier, continuous print light intensity signal I (θ, φ) is measured light difference luminous flat
Light distribution on different light emitting angers；
9) light intensity data obtained by is again through the calculating of following luminosity computing formula:
Can calculate by the luminous flux of light-metering, thus realize the accurate measurement to distribution of light sources luminosity.
Described step 6) in the luminous reflectance that sends of measured light a direction accept modulation to chopper, by adjusting chopping the light
Device frequency realizes.
Distributed luminosity based on lock-in amplifier measures system, including with double free turntables and the distribution photometer of diaphragm
Main frame, for detecting the photodetector of optical signal and to the detection computer that processes of signal；It is characterized in that described
The front end of photodetector is furnished with the chopper that the optical signal to the reflection of distribution photometer main frame is modulated, and chopper is connected to
Manipulator, described system is also configured with lock-in amplifier, and the reference signal end of lock-in amplifier connects the signal of chopper
Input, the reference signal end of lock-in amplifier connects the signal output part of manipulator, the letter after lock-in amplifier computing
Number it is delivered to computer.
Described photodetector and chopper are installed in detector carriage.
The invention has the beneficial effects as follows:
The measuring method that the present invention provides, owing to being configured with lock-in amplifier at distribution photometer, eliminates nothing effectively
The noise signal of dependency, eliminates the interference of noise signal, thus can accurately pick up faint tested letter in noise signal
Number detect, particularly can be to the high-acruracy survey (measured deviation is less than 2%) of low light level distributed luminosity.The survey that the present invention provides
Amount system, only adds lock-in amplifier and chopper on the basis of existing equipment, thus simple in construction, practical, especially
It is suitable for the detection of faint light.
Accompanying drawing explanation
Fig. 1 is the attachment structure schematic diagram of distributed luminosity test system involved by the embodiment of the present invention.
Fig. 2 is the measurement procedure schematic diagram of the embodiment of the present invention.
Figure has: distribution photometer main frame 1, double freedom turntable 2, sample 3, power supply 4, diaphragm 5, light electrical resistivity survey
Survey device 6, chopper 7, manipulator 8, lock-in amplifier 9, optical path 10, computer 11, detector carriage 12.
Detailed description of the invention
Further illustrate below in conjunction with embodiment shown in the drawings.
Lock-in amplifier is small-signal phase-sensitive detection device based on correlation detection technology.Coherent detection is frequency-region signal
Arrowband processing method, be the measurement of correlation of a kind of integral process.It utilizes correlation properties between signal and external signal, picks
Except the noise signal of non-correlation is disturbed, reach accurately to pick up in noise signal to detect faint measured signal purpose.
The distributed luminosity test system using lock-in amplifier includes with lower part:
Distribution photometer main frame is with double free turntables and diaphragm 5, and photodetector is used for detecting optical signal, computer 11
For detection signal is processed；These are all similar with existing distributed luminosity test system.
The improvement of the present invention, one is to be furnished with the chopper that the optical signal to the reflection of distribution photometer main frame is modulated, should
Chopper is arranged on the front end of described photodetector；Described photodetector and chopper are mounted in detector carriage.
Two is that described system is configured with lock-in amplifier, and the reference signal end of this lock-in amplifier connects chopper and manipulator,
The input of lock-in amplifier connects the outfan of photodetector, and the signal after lock-in amplifier computing is delivered to computer.
The measuring method that the present invention provides comprises the following steps (seeing Fig. 2):
1, placing chopper in photodetector front end, chopper connects manipulator, and manipulator reconnects lock-in amplifier.
Wherein manipulator controls the operating frequency of chopper according to test needs, regulation, and as frequency signal, inputs to phase-locked putting
The reference signal end of big device；
2, photodetector outfan is connected to the test signal input part of lock-in amplifier, lock-in amplifier is exported
Measured signal；
3, the signal output part of lock-in amplifier is connected on computer, is used for receiving light intensity data；
4, sample (light fixture or light source) is placed in distribution photometer station to be measured to fix, and connects power line；
5, switch on power to package unit, i.e. give computer, distribution photometer host supplying power, light measured light；To light
Electric explorer, lock-in amplifier, chopper are powered, and make equipment enter duty；
6, distribution photometer main axis, luminous reflectance measured light a direction sent by photometric reflecting mirror
Received by photodetector again after accepting modulation to chopper, then export as measured signal；Lock-in amplifier receives simultaneously
To coming from the reference frequency signal of chopper and manipulator, and as lock-in amplifier computing reference signal；Reference signal and
Measured signal is input simultaneously in lock-in amplifier, and computer is by the photoelectricity after the acquisition of software collection lock-in amplifier and computing
Signal record.
7, lock-in amplifier uses Theory of correlation detection, by carrying out reference signal x (t), measured signal y (t)
Be multiplied Integral Processing, the noise of suppression detector, makes faint optical signal detect from noise；That is:
X (t)=Vs (t)+n1(t)
Y (t)=Vr (t)+n2(t)
8, owing to photometer is by controlling turntable real-time motion, the light sent by light source different directions is constantly delivered to visit
Surveying in device, it is luminous that continuous print light intensity signal I (θ, φ) that lock-in amplifier obtains is measured light difference luminous flat difference
Light distribution on angle；
9, obtained light intensity data is used following luminosity computing formula (conventional public by the signal processing system in computer
Formula) calculate:
Thus calculate by the luminous flux of light-metering, it is achieved and the accurate measurement to distribution of light sources luminosity, especially the low light level is distributed
The high-acruracy survey of luminosity.
Test concrete example
Choose the standard LED straight tube light source of a low light level.Its luminous flux by certificate of measurement and weight it is known that be 14.02lm.
With conventional this sample of distributed photometer retest 3 times, record luminous flux respectively:
14.93lm, 13.56lm, 14.45lm；
Thus illustrate, measure in case in weak light source maximum conditions, record the linearity of luminous flux array and concordance relatively
Difference, the data such as luminous flux, light distribution all cannot ensure accurate reliability.
Use distributed luminosity based on the lock-in amplifier test system that the present invention provides, retest 3 times, record light and lead to
Amount is respectively as follows: 14.20lm, 14.26lm, 14.21lm.Compared with sample standard value, deviation < 2%, it was demonstrated that repeated measurement data has
There is high concordance.
Claims (4)
1. distributed luminosity measuring method based on lock-in amplifier, sequentially includes the following steps:
1) placing chopper in photodetector front end, chopper is connected to manipulator, and manipulator reconnects lock-in amplifier；Its
Middle manipulator controls the operating frequency of chopper according to test needs, regulation, and as frequency signal, inputs to phase-locked amplification
The reference signal end of device；
2) photodetector outfan is connected to the test signal input part of lock-in amplifier, tested to lock-in amplifier output
Signal；
3) signal output part of lock-in amplifier is connected to computer, receives light intensity data for computer；
4) sample (light fixture or light source) is placed in distribution photometer station to be measured to fix, and connects power line；
5) give computer, distribution photometer host supplying power, light measured light；To photodetector, lock-in amplifier, chopper
Power supply, makes equipment enter duty；
6) distribution photometer main axis, luminous reflectance measured light a direction sent by the reflecting mirror of distribution photometer
Received by photodetector again after accepting modulation to chopper, then export as measured signal；Lock-in amplifier receives simultaneously
To coming from the reference frequency signal of chopper and manipulator, and as lock-in amplifier computing reference signal；Reference signal and
Measured signal is input simultaneously in lock-in amplifier, and computer is by the photoelectricity after the acquisition of software collection lock-in amplifier and computing
Signal record；
7) lock-in amplifier is by the Integral Processing that is multiplied reference signal x (t), measured signal y (t), suppresses photoelectricity
The noise of detector, makes faint optical signal detect from noise；
8) distribution photometer is by controlling double freedom turntable real-time motion, and the light sent by light source different directions constantly delivers to light
In electric explorer, obtained by lock-in amplifier, continuous print light intensity signal I (θ, φ) is measured light difference luminous flat difference
Light distribution on light emitting anger；
9) light intensity data obtained by is again through the calculating of following luminosity computing formula:
Can calculate by the luminous flux of light-metering, thus realize the accurate measurement to distribution of light sources luminosity.
Distributed luminosity measuring method based on lock-in amplifier the most according to claim 1, it is characterised in that: described step
6) luminous reflectance that in, measured light a direction sends accepts modulation to chopper, realizes by adjusting chopper frequency.
3. distributed luminosity based on lock-in amplifier measures system, including the distribution photometer master with double free turntables and diaphragm
Machine (1), for detecting the photodetector (6) of optical signal and to the detection computer (11) that processes of signal；Its feature
It is that the front end of described photodetector is furnished with the chopper (7) that the optical signal to the reflection of distribution photometer main frame is modulated；
Chopper is connected to manipulator (8), and described system is also configured with lock-in amplifier (9), the reference signal of lock-in amplifier
End connects the signal output part of manipulator, and the input of lock-in amplifier connects the outfan of photodetector, lock-in amplifier
Signal after computing is delivered to computer.
Distributed luminosity based on lock-in amplifier the most according to claim 3 measures system, it is characterised in that: described photoelectricity
Detector and chopper are installed in detector carriage (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610620370.4A CN106225919A (en) | 2016-07-29 | 2016-07-29 | Distributed luminosity measuring method based on lock-in amplifier and the system of measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610620370.4A CN106225919A (en) | 2016-07-29 | 2016-07-29 | Distributed luminosity measuring method based on lock-in amplifier and the system of measurement |
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| CN106225919A true CN106225919A (en) | 2016-12-14 |
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| CN201610620370.4A Pending CN106225919A (en) | 2016-07-29 | 2016-07-29 | Distributed luminosity measuring method based on lock-in amplifier and the system of measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017896A (en) * | 2019-04-03 | 2019-07-16 | 大连工业大学 | Space photometric distribution method for fast measuring and photometric measuring apparatus |
| CN112964714A (en) * | 2021-02-18 | 2021-06-15 | 北京理工大学 | Weak infrared radiation degree measuring device and method suitable for low-temperature vacuum cold chamber environment |
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|---|---|---|---|---|
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| CN201170750Y (en) * | 2008-02-04 | 2008-12-24 | 杭州浙大三色仪器有限公司 | Distribution photometer |
| CN104833419A (en) * | 2015-06-05 | 2015-08-12 | 哈尔滨工业大学 | 1-3 micrometer collimated light source radiation illumination measuring instrument |
| CN205940763U (en) * | 2016-07-29 | 2017-02-08 | 杭州市质量技术监督检测院 | Distribution photometry system based on lock -in amplifier |
-
2016
- 2016-07-29 CN CN201610620370.4A patent/CN106225919A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH665906A5 (en) * | 1983-12-23 | 1988-06-15 | Lmt Lichtmesstechnik Berlin | GONIOPHOTOMETER. |
| CN201170750Y (en) * | 2008-02-04 | 2008-12-24 | 杭州浙大三色仪器有限公司 | Distribution photometer |
| CN104833419A (en) * | 2015-06-05 | 2015-08-12 | 哈尔滨工业大学 | 1-3 micrometer collimated light source radiation illumination measuring instrument |
| CN205940763U (en) * | 2016-07-29 | 2017-02-08 | 杭州市质量技术监督检测院 | Distribution photometry system based on lock -in amplifier |
Non-Patent Citations (3)
| Title |
|---|
| 倪凯，牟同升: "《带旋转反光镜的分布光度测试系统》", 《光学仪器》 * |
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| 李倩，潘建根: "《用分布光度法实现光通量的精确测量》", 《四直辖市照明科技论坛、长三角照明科技论坛暨上海市照明学2008年年会论文集》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017896A (en) * | 2019-04-03 | 2019-07-16 | 大连工业大学 | Space photometric distribution method for fast measuring and photometric measuring apparatus |
| CN112964714A (en) * | 2021-02-18 | 2021-06-15 | 北京理工大学 | Weak infrared radiation degree measuring device and method suitable for low-temperature vacuum cold chamber environment |
| CN112964714B (en) * | 2021-02-18 | 2022-03-04 | 北京理工大学 | Weak infrared radiation degree measuring device and method suitable for low-temperature vacuum cold chamber environment |
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