CN103292917B - Based on the photelectric receiver time stability method of testing of acousto-optic amplitude modulation - Google Patents
Based on the photelectric receiver time stability method of testing of acousto-optic amplitude modulation Download PDFInfo
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- CN103292917B CN103292917B CN201310192144.7A CN201310192144A CN103292917B CN 103292917 B CN103292917 B CN 103292917B CN 201310192144 A CN201310192144 A CN 201310192144A CN 103292917 B CN103292917 B CN 103292917B
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Abstract
Photelectric receiver time stability method of testing based on acousto-optic amplitude modulation belongs to laser application technique, the method adopts single-frequency laser as light source, the double-frequency laser that output amplitude is adjustable after acousto-optic modulator, utilize and carry out light splitting without inclined Amici prism, and test the phase differential between photelectric receiver to be measured and reference photelectric receiver; The advantage of this method is that in test, reference beam medium frequency is v
1be v with frequency
2linearly polarized light coaxially with light path transmission, measuring beam medium frequency is v
1be v with frequency
2linearly polarized light coaxially transmit with light path; Two beam phase are not by external environment variable effect, and do not introduce extra phase error, test accuracy is high.And can by the time stability of the photelectric receiver under the light intensity test different light intensity of adjustment double-frequency laser.
Description
Technical field
The invention belongs to laser application technique, relate generally to a kind of photelectric receiver time stability method of testing based on acousto-optic amplitude modulation.
Background technology
Laser interferometry with features such as its high sensitivity, high precision and noncontacts in the sophisticated industry equipments such as Precision and Ultra-precision Machining, microelectronics equipment, nanometer technology and defence equipment field in occupation of more and more important application status, and to be used widely.
In laser heterodyne interference system, photelectric receiver plays the vital role realizing Signal reception, signal conversion, and its performance particularly time stability will directly affect Measurement sensibility and the measuring accuracy of whole measuring system.In order to study the time stability of photelectric receiver, the noisiness of Xi'an University of Technology to the core devices photodetector in photelectric receiver has carried out analyzing (Xie Guangyong. photodetector Analysis of Noise Properties. the infotech .2008.11 phase).To the noise source of photodetector in article, mechanism of noise generation etc. have carried out theoretical analysis and research, lay the foundation to the authenticity of the further output signal of research photelectric receiver and stability.But, in the document just the noisiness analyzing photodetector of principle and noise on the impact of stability, do not calculate the actual parameter of photodetector stability, and in analysis, only considered photodetector, the error do not introduced in consideration electric signal processing circuit and the impact on stability.
OsaydKharraz is the noisiness (OsaydKharraz of two kinds of photodetector PIN and APD with simulation software analog simulation, DavidForsyth.PerformancecomparisonsbetweenPINandAPDphoto detectorsforuseinopticalcommunicationsystems.Optic.) theoretical simulation drawn the noisiness curve of two kinds of photodetectors, and the labor relation of photodetector gain and noise, be conducive to the stability more specifically analyzing photelectric receiver in detail.But, the also noisiness of theoretical analysis photodetector and data, the error do not introduced in actual analysis electric signal processing circuit and the impact on stability thereof in the document.
In sum, current is all by theoretical and the Realization of Simulation to the noise analysis of photelectric receiver and the analysis of stability characteristic, the not time stability of actual testing photoelectronic receiver, thus make only to rest on the theoretical analysis stage to the demarcation of the stability of photelectric receiver, and inaccurate; And current analysis is all only analyzed for the stability of the photoelectric detector in photelectric receiver, time stability analysis is not carried out to the electric signal processing circuit of photelectric receiver, and in reality, electric signal processing circuit part can introduce phase drift in the output signal of photelectric receiver, thus the time stability of photelectric receiver is had an impact, also can affect the demarcation of the working time stability to Heterodyne Interferometer System Based to a certain extent simultaneously.
Summary of the invention
For above-mentioned prior art Problems existing, the present invention proposes a kind of photelectric receiver time stability method of testing based on acousto-optic amplitude modulation, measure and treat by the peak-to-peak value of the phase differential change to standard photelectric receiver and photelectric receiver to be measured output signal the phase stability surveying photelectric receiver and carry out integrated testability, and changed the light intensity of output optical signal by acousto-optic modulator, the time stability of the photelectric receiver to be measured under different light intensity can be obtained.
The present invention is achieved through the following technical solutions:
Based on a photelectric receiver time stability method of testing for acousto-optic amplitude modulation, the method step is as follows:
(1) single-frequency laser sends a branch of single-frequency laser, the double-frequency laser that output amplitude is adjustable after acousto-optic modulator, comprises frequency and is respectively v
1and v
2, polarization direction is respectively the mutually orthogonal linearly polarized light of horizontal direction and vertical direction, and this dual frequency laser beam is divided into reference beam a and measuring beam b after without inclined Amici prism, and comprise frequency in reference beam a and measuring beam b is v all simultaneously
1be v with frequency
2orhtogonal linear polarizaiton light;
(2) reference beam a is transmitted to analyzer a, and the polarization direction of analyzer a is from the horizontal by 45 ° of angles, and reference beam a is after analyzer a, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, when arriving standard photelectric receiver, phase place is
standard photelectric receiver receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
reference signal; Wherein, the phase stability of standard photelectric receiver is
(3) measuring beam b is transmitted to analyzer b through plane mirror, and the polarization direction of analyzer b is consistent with analyzer a polarization direction, and measuring beam b is after analyzer b, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, when arriving photelectric receiver to be measured, phase place is
photelectric receiver to be measured receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
measuring-signal; Wherein, the phase stability of photelectric receiver to be measured is
(4) output signal of standard photelectric receiver and photelectric receiver to be measured sends into phasometer, gathers the phase differential of the output signal of two photelectric receivers
(5) the phase differential result that will calculate of phasometer
send into data acquisition module, to the phase differential of standard photelectric receiver and photelectric receiver to be measured in time period 0 ~ t
gather, and phase differential in computing time section 0 ~ t
the peak-to-peak value of change
the phase stability of photelectric receiver to be measured
for
(6) amplitude of the double-frequency laser regulating acousto-optic modulator to export, the phase stability of repeated test photelectric receiver to be measured
obtain the phase stability of the photelectric receiver to be measured in difference input light intensity situation.
For using a branch of double-frequency laser sent by laser instrument without inclined Amici prism to separate, form reference beam a and measuring beam b, comprise frequency in two light beams is v all simultaneously
1be v with frequency
2orhtogonal linear polarizaiton light, in transmitting procedure, reference beam a medium frequency is v
1be v with frequency
2linearly polarized light to arrive the light path of standard photelectric receiver consistent; Measuring beam b medium frequency is v
1be v with frequency
2linearly polarized light to arrive the light path of photelectric receiver to be measured consistent.
The present invention has following characteristics and good result:
(1) use in the present invention without inclined Amici prism to laser beam light splitting, can ensure that reference beam a medium frequency is v
1be v with frequency
2linearly polarized light coaxial, transfer to standard photelectric receiver with light path, the light path arriving two linearly polarized lights during standard photelectric receiver is consistent; Measuring beam b medium frequency is v
1be v with frequency
2linearly polarized light coaxial, transfer to photelectric receiver to be measured with light path, the light path arriving photelectric receiver to be measured is consistent; In transmitting procedure, although the change such as temperature, pressure can cause the change of air refraction in light path, but the phase place of the beat frequency interference light beam in reference beam a and measuring beam b is not had an impact, standard photelectric receiver and the photelectric receiver input signal to be measured phase jitter impact on test can be eliminated.
(2) the present invention uses the time stability of the method testing photoelectronic receiver of actual measurement, by the photo-beat of photelectric receiver frequently the time stability of signal receiving end and photo-beat audio signalprocessing circuit part want that method for stability is actual by test simultaneously and test out, accurately can record the time stability of photelectric receiver to be measured.
(3) adopt acousto-optic amplitude modulation to produce a branch of double-frequency laser, the beat frequency light intensity magnitude of the double-frequency laser in test can be changed in range of adjustment, test the time stability of the photelectric receiver under different light intensity.
Accompanying drawing explanation
Accompanying drawing is the inventive method step schematic diagram
In figure: 1 single-frequency laser, 2 acousto-optic modulators, 3 are without inclined Amici prism, 4 plane mirrors, 5 analyzer a, 6 analyzer b, 7 standard photelectric receivers, 8 photelectric receivers to be measured, 9 phasometers, 10 data acquisition modules.
Embodiment
Below in conjunction with accompanying drawing, example of the present invention is described in detail.
Based on a photelectric receiver time stability method of testing for acousto-optic modulator, the method step is as follows:
(1) single-frequency laser 1 sends beam of laser, and this Shu Jiguang, after acousto-optic modulator 2, becomes a branch of frequency that comprises and is respectively v
1and v
2dual frequency laser beam, polarization direction is respectively the mutually orthogonal linearly polarized light of horizontal direction and vertical direction, this dual frequency laser beam is divided into reference beam a and measuring beam b after without inclined Amici prism 3, and comprise frequency in reference beam a and measuring beam b is v all simultaneously
1be v with frequency
2orhtogonal linear polarizaiton light;
(2) reference beam a is transmitted to analyzer a5, and the polarization direction of analyzer a5 is from the horizontal by 45 ° of angles, and reference beam a is after analyzer a5, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, and frequency is v
1and v
2linearly polarized light to arrive the light path of standard photelectric receiver 7 consistent, when arriving standard photelectric receiver 7, phase place is
standard photelectric receiver 7 receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
reference signal; Wherein, the phase stability of standard photelectric receiver 7 is
(3) measuring beam b is transmitted to analyzer b6 through plane mirror 4, and the analyzer a5 polarization direction, polarization direction of analyzer b6 is consistent, and measuring beam b is after analyzer b6, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, and frequency is v
1and v
2linearly polarized light to arrive the light path of photelectric receiver 8 to be measured consistent, when arriving photelectric receiver 8 to be measured, phase place is
photelectric receiver 8 to be measured receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
measuring-signal; Wherein, the phase stability of photelectric receiver 8 to be measured is
(4) reference signal of standard photelectric receiver 7 output and the measuring-signal of photelectric receiver to be measured 8 output send into phasometer 9, gather the phase differential of the output signal of two photelectric receivers
(5) the phase differential result that will calculate of phasometer 9
send into data acquisition module 10, to the phase differential of standard photelectric receiver 7 and photelectric receiver to be measured 8 in time period 0 ~ t
gather, and phase differential in computing time section 0 ~ t
the peak-to-peak value of change
the phase stability of photelectric receiver to be measured
for
in formula
for smallest peaks peak value,
for maximum peak peak value;
(6) frequency of the double-frequency laser regulating acousto-optic modulator 2 to export, the phase stability of repeated test photelectric receiver 8 to be measured
obtain the phase stability of the photelectric receiver to be measured under difference input light frequency.
Claims (1)
1., based on a photelectric receiver time stability method of testing for acousto-optic amplitude modulation, it is characterized in that the method step is as follows:
(1) single-frequency laser sends a branch of single-frequency laser, and the frequency that comprises that output amplitude is adjustable after acousto-optic modulator is respectively v
1and v
2double-frequency laser, polarization direction is respectively the mutually orthogonal linearly polarized light of horizontal direction and vertical direction, this dual frequency laser beam is divided into reference beam a and measuring beam b after without inclined Amici prism, and comprise frequency in reference beam a and measuring beam b is v all simultaneously
1be v with frequency
2orhtogonal linear polarizaiton light;
(2) reference beam a is transmitted to analyzer a, and the polarization direction of analyzer a is from the horizontal by 45 ° of angles, and reference beam a is after analyzer a, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, and frequency v
1with frequency v
2linearly polarized light to arrive the light path of standard photelectric receiver consistent, when arriving standard photelectric receiver, phase place is
standard photelectric receiver receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
reference signal; Wherein, the phase stability of standard photelectric receiver is
(3) measuring beam b is transmitted to analyzer b through plane mirror, and the polarization direction of analyzer b is consistent with analyzer a polarization direction, and measuring beam b is after analyzer b, and the frequency exporting polarization direction identical is respectively v
1and v
2linearly polarized light; Frequency is respectively v
1and v
2the identical linearly polarized light in polarization direction produce a branch of beat frequency interference light, and frequency v
1with frequency v
2linearly polarized light to arrive the light path of photelectric receiver to be measured consistent, when arriving photelectric receiver to be measured, phase place is
photelectric receiver to be measured receives beat frequency interference light, and output frequency is v
0=| v
1-v
2|, phase place is
measuring-signal; Wherein, the phase stability of photelectric receiver to be measured is
(4) reference signal of standard photelectric receiver output and the measuring-signal of photelectric receiver to be measured output send into phasometer, gather the phase differential of the output signal of two photelectric receivers
(5) the phase differential result that will calculate of phasometer
send into data acquisition module, to the phase differential of standard photelectric receiver and photelectric receiver to be measured in time period 0 ~ t
gather, and phase differential in computing time section 0 ~ t
the peak-to-peak value of change
the phase stability of photelectric receiver to be measured
for
in formula
for smallest peaks peak value,
for maximum peak peak value;
(6) amplitude of the double-frequency laser regulating acousto-optic modulator to export, the phase stability of repeated test photelectric receiver to be measured
obtain the phase stability of the receiver to be measured when difference input light intensity.
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| CN104051947B (en) * | 2014-07-01 | 2017-05-17 | 哈尔滨工业大学 | Dual-longitudinal-mode-laser-device interlocking method and device based on piezoelectric effect and acousto-optic frequency shift |
| CN104037610B (en) * | 2014-07-01 | 2017-08-01 | 哈尔滨工业大学 | Single longitudinal mode laser interlock method and device based on hot frequency stabilization and acousto-optic frequency translation |
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| US5883717A (en) * | 1996-06-04 | 1999-03-16 | Northeastern University | Optical quadrature interferometry utilizing polarization to obtain in-phase and quadrature information |
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| US4832489A (en) * | 1986-03-19 | 1989-05-23 | Wyko Corporation | Two-wavelength phase-shifting interferometer and method |
| US5883717A (en) * | 1996-06-04 | 1999-03-16 | Northeastern University | Optical quadrature interferometry utilizing polarization to obtain in-phase and quadrature information |
| CN101126784A (en) * | 2007-09-18 | 2008-02-20 | 浙江大学 | Photoelectric detector amplitude versus frequency character test method for optical fiber peg-top |
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