CN115507933A - Tracing method and device for broadband laser vibration meter calibrating device - Google Patents
Tracing method and device for broadband laser vibration meter calibrating device Download PDFInfo
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- CN115507933A CN115507933A CN202211034271.XA CN202211034271A CN115507933A CN 115507933 A CN115507933 A CN 115507933A CN 202211034271 A CN202211034271 A CN 202211034271A CN 115507933 A CN115507933 A CN 115507933A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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Abstract
The invention discloses a tracing method and a tracing device for a broadband laser vibrometer calibration device, and belongs to the technical field of photoelectric measurement. The device comprises a laser vibration meter, a first polarization spectroscope, a first acousto-optic modulator, a lambda/4 wave plate, a second polarization spectroscope, a lambda/2 wave plate, a second acousto-optic modulator, a concave reflector, a first sinusoidal signal source, an FM signal source, a second sinusoidal signal source, a plane reflector, a third polarization spectroscope, a photoelectric detector, a filter amplifier, a data acquisition system and an electronic computer. The method utilizes the laser frequency and the measuring laser used for calibrating the laser vibration meter to carry out heterodyne beat frequency, and the down conversion of the optical frequency signal is completed; the FM signal waveform in the radio frequency range is obtained without using external resources, and after the FM signal in the radio frequency range is collected by using a data collection system, the standard vibration magnitude value and the vibration frequency value reproduced by the broadband laser vibration meter calibration device are obtained by using an FM signal demodulation method, so that the magnitude value is effectively traced.
Description
Technical Field
The invention relates to a tracing method and a tracing device for a broadband laser vibrometer calibration device, and belongs to the technical field of photoelectric measurement.
Background
The laser vibration meter is a universal, basic vibration and impact measuring instrument, has high precision, non-contact and no additional interference and influence on the measured object, and its measurement calibration and performance evaluation are difficult problems in industry, mainly because: 1) The excitation of the device is a motion quantity value (displacement, speed and acceleration), the used measuring principle is based on the laser Doppler effect, physical motion needs to be sensed through light frequency change, and the output is a result given in an electric signal data form, and the device relates to different aspects of mechanical motion, light frequency control, electronic measurement and the like. 2) Since the frequency range and accuracy of photoelectric measurement are much higher than those of mechanical motion magnitude, suitable excitation sources required for measurement calibration and performance evaluation are always lacking, and it is difficult to find out a desirable device and apparatus. 3) The measurement and calibration are usually carried out by exciting through a standard vibration table, measuring the quantity value by a standard laser vibration meter and carrying out measurement and calibration on other laser vibration meters. The vibration table belongs to a physical motion device of an electromechanical structure, is limited by the limitations of a physical principle, a mechanical principle and the like, and the limitations of materials, machining capacity and the like, and compared with a photoelectric measuring instrument such as a laser vibration meter, the stability of the photoelectric measuring instrument is not easy to reach very high, the frequency band is narrow, the amplitude can reach a larger magnitude value at low frequency, and under the condition of high frequency, the amplitude can only realize a very small magnitude value, the accuracy is lower, and the technical requirement of measuring and tracing the source of the broadband laser vibration meter is difficult to achieve. 4) On the other hand, the problem of technical logic also exists when the standard laser vibration meter is used for measuring and tracing other laser vibration meters, and the problem of measuring and calibrating the standard laser vibration meter cannot be solved.
The utility model provides a wide band laser vibrometer calibrating device, uses two AOMs to carry out the calibration of laser vibrometer with the optical frequency modulation mode, has overcome the ability problem that uses mechanical vibration platform to encourage and calibrate, can realize the measurement calibration of wide vibration range and wide frequency range laser vibrometer. However, since it belongs to a dedicated instrument device, it also has a problem of how to implement the quantity tracing, and it is not yet possible to directly trace the quantity in a simple manner.
The invention aims at a technical target, and provides a broadband laser vibration meter calibration device which comprises a laser vibration meter, a first acousto-optic modulator, a second acousto-optic modulator, a concave reflector, a first sinusoidal signal source, an FM signal source and a second sinusoidal signal source.
Laser generated by the laser vibrometer passes through the first acousto-optic modulator, is subjected to + 1-level diffraction frequency shift by the first acousto-optic modulator controlled by the first sinusoidal signal source, then reaches the second acousto-optic modulator, the second sinusoidal signal source generates a sinusoidal signal, the FM signal source is subjected to frequency modulation, a modulated FM signal is generated to control the second acousto-optic modulator, the optical frequency transmitted by the first acousto-optic modulator is subjected to frequency shift and modulation, and-1-level diffraction laser is generated, reaches the concave mirror, returns to the second acousto-optic modulator after being reflected and focused, is subjected to frequency shift and modulation again by the second acousto-optic modulator, then passes through the first acousto-optic modulator for frequency shift, returns to the laser vibrometer, and completes the simulation process of vibration excitation of the laser vibrometer by the sinusoidal waveform generated by the second sinusoidal signal source.
Disclosure of Invention
The invention aims at the problem of magnitude traceability of a broadband laser vibration meter calibrating device, and mainly aims to provide a traceability method and a traceability device of the broadband laser vibration meter calibrating device.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a tracing method of a broadband laser vibration meter calibrating device, which obtains a laser Doppler vibration signal reproduced by the broadband laser vibration meter calibrating device in an heterodyne laser measuring mode, demodulates an analog vibration magnitude signal waveform in a waveform measuring and FM signal demodulating mode, obtains a standard value of a vibration parameter, and traces the standard value to a time frequency magnitude value through a data acquisition system, thereby realizing the magnitude tracing of the broadband laser vibration meter calibrating device.
The invention discloses a tracing device of a broadband laser vibration meter calibration device, which comprises a laser vibration meter, a first polarization spectroscope, a first acousto-optic modulator, a lambda/4 wave plate, a second polarization spectroscope, a lambda/2 wave plate, a second acousto-optic modulator, a concave reflector, a first sinusoidal signal source, an FM signal source, a second sinusoidal signal source, a plane reflector, a third polarization spectroscope, a photoelectric detector, a filter amplifier, a data acquisition system and an electronic computer.
Laser generated by a laser vibration meter passes through a first polarization spectroscope and reaches a first acousto-optic modulator, the first acousto-optic modulator is controlled by a sinusoidal signal generated by a first sinusoidal signal source, the +1 diffraction order frequency shift is carried out on the laser from the first polarization spectroscope, then the laser passes through a lambda/4 wave plate, and the laser reaches a second polarization spectroscope and is divided into two paths by one path.
One path of the laser light is transmitted light and reaches the second sound light modulator, the second sine signal source generates sine waves with frequency omega, the FM signal source is subjected to frequency modulation to obtain modulated FM signals to control the second sound light modulator, the laser signals transmitted from the second polarization spectroscope are subjected to light frequency modulation on-1 diffraction level to obtain frequency-modulated laser, the frequency-modulated laser reaches the concave reflector, is reflected and focused back to the second sound light modulator, and after being modulated again, the frequency-modulated laser sequentially passes through the second polarization spectroscope, the lambda/4 wave plate and the first acousto-optic modulator to reach the first polarization spectroscope and is divided into two beams by one beam.
One beam directly passes through the first polarization beam splitter and returns to the laser vibration meter to be used for calibrating the laser vibration meter.
The other beam is reflected by the plane reflector, passes through the lambda/2 wave plate and the third polarization spectroscope in sequence, and is subjected to beam combination and beat frequency interference with the laser from the second polarization spectroscope and reflected by the third polarization spectroscope at the third polarization spectroscope;
and the other path of light reflected and split by the second polarizing beam splitter is reflected by the third polarizing beam splitter, is subjected to beam combination and beat frequency interference with laser passing through the third polarizing beam splitter in the direction of the lambda/2 wave plate, reaches the photoelectric detector, and is read by the photoelectric detector to obtain a radio frequency FM signal after beat frequency. The radio frequency FM signal is filtered and amplified by the filter amplifier, data of the data acquisition system is acquired, the radio frequency FM signal enters the electronic computer, and a standard vibration magnitude value and a vibration frequency value reproduced by the broadband laser vibration meter calibrating device are obtained by using an FM signal demodulation algorithm, so that the magnitude value of the broadband laser vibration meter calibrating device is effectively traced.
Preferably, the first polarization beam splitter is used for extracting vibration laser signals, the second polarization beam splitter is used for extracting frequency shift laser signals, beam combination and beat frequency are carried out, and FM signal waveforms in a radio frequency range are obtained;
preferably, the first acousto-optic modulator and the second acousto-optic modulator are used, the frequency shift and modulation of which can be operated not only in the + -1 st diffraction order, but also in any other diffraction order such as the + -2 nd diffraction order, the + -3 rd diffraction order, etc.
Has the advantages that:
1. the invention discloses a tracing method and a tracing device of a broadband laser vibration meter calibration device, which utilize the laser frequency existing in the original broadband laser vibration meter calibration device and the measuring laser used for calibrating the laser vibration meter to carry out heterodyne beat frequency to complete the down-conversion action of optical frequency signals, do not need to reuse external resources to further obtain FM signal waveforms in a radio frequency range, and utilize a data acquisition system to effectively acquire the FM signals in the radio frequency range, and utilize an FM signal demodulation method to obtain standard vibration magnitude values and vibration frequency values reproduced by the broadband laser vibration meter calibration device, thereby realizing the aim of effectively tracing the magnitude values of the FM signal frequency values.
2. The invention discloses a method and a device for tracing the source of a broadband laser vibration meter calibrating device, which are used for tracing the source of the magnitude of the broadband laser vibration meter calibrating device by using the radio frequency parameter of a data acquisition system, and the radio frequency magnitude can easily reach dozens of gigahertz at present and is far higher than the frequency range reproduced by the broadband laser vibration meter and the calibrating device thereof, so the problem of tracing the magnitude of any broadband laser vibration meter calibrating device under the current technical condition can be solved by using the method and the device; in addition, the invention also has the technical advantages of simple light path and accurate and reliable magnitude.
Drawings
Fig. 1 is a schematic structural diagram of a tracing device of a calibration device for a broadband laser vibration meter according to the present invention.
Wherein: the system comprises a laser vibration meter 1, a laser vibration meter 2, a first polarization spectroscope, a first acousto-optic modulator 3, a 4-lambda/4 wave plate, a second polarization spectroscope 5, a lambda/2 wave plate 6, a second acousto-optic modulator 7, a concave reflector 8, a first sinusoidal signal source 9, an FM signal source 10, a second sinusoidal signal source 11, a plane reflector 12, a third polarization spectroscope 13, a photoelectric detector 14, a filter amplifier 15, a data acquisition system 16 and an electronic computer 17.
Detailed Description
To better illustrate the objects and advantages of the present invention, the following further description is made with reference to the accompanying drawings and examples.
Example 1:
in the tracing method of the broadband laser vibration meter calibration device disclosed in this embodiment, a laser doppler vibration signal reproduced by the broadband laser vibration meter calibration device is obtained in an heterodyne laser measurement mode, then a waveform of an analog "vibration magnitude signal waveform" is demodulated in a waveform measurement and FM signal demodulation mode, a standard value of a vibration parameter is obtained, and the standard value is traced to a time frequency magnitude value through a data acquisition system, so that the magnitude tracing of the "broadband laser vibration meter calibration device" is realized.
The broadband laser vibration meter calibrating device comprises a laser vibration meter, a first acoustic-optic modulator, a second acoustic-optic modulator, a concave reflector, a first sinusoidal signal source, an FM signal source and a second sinusoidal signal source.
Laser generated by the laser vibrometer passes through the first acousto-optic modulator, is subjected to + 1-level diffraction frequency shift by the first acousto-optic modulator controlled by the first sinusoidal signal source, then reaches the second acousto-optic modulator, the second sinusoidal signal source generates a sinusoidal signal, the FM signal source is subjected to frequency modulation, a modulated FM signal is generated to control the second acousto-optic modulator, the optical frequency transmitted by the first acousto-optic modulator is subjected to frequency shift and modulation, and-1-level diffraction laser is generated, reaches the concave mirror, returns to the second acousto-optic modulator after being reflected and focused, is subjected to frequency shift and modulation again by the second acousto-optic modulator, then passes through the first acousto-optic modulator for frequency shift, returns to the laser vibrometer, and completes the simulation process of vibration excitation of the laser vibrometer by the sinusoidal waveform generated by the second sinusoidal signal source.
Example 2:
as shown in fig. 1, the present embodiment discloses a tracing method for a calibration device of a broadband laser vibrometer, which is implemented based on the tracing device of the calibration device of the broadband laser vibrometer, and the tracing device of the calibration device of the broadband laser vibrometer is composed of a laser vibrometer 1, a first polarization beam splitter 2, a first acousto-optic modulator 3, a λ/4 wave plate 4, a second polarization beam splitter 5, a λ/2 wave plate 6, a second acousto-optic modulator 7, a concave reflector 8, a first sinusoidal signal source 9, an FM signal source 10, a second sinusoidal signal source 11, a plane reflector 12, a third polarization beam splitter 13, a photodetector 14, a filter amplifier 15, a data acquisition system 16, and an electronic computer 17.
Laser generated by a laser vibration meter 1 passes through a first polarization spectroscope 2 to reach a first acousto-optic modulator 3, the first acousto-optic modulator 3 controlled by a sine signal generated by a first sine signal source 9 carries out +1 diffraction order frequency shift on the laser from the first polarization spectroscope 2, then passes through a lambda/4 wave plate 4, and reaches a second polarization spectroscope 5 to be divided into two paths by one path.
One path of the laser light is transmitted light and reaches the second sound light modulator 7, the second sinusoidal signal source 11 generates a sinusoidal wave with frequency omega, frequency modulation is carried out on the FM signal source 10, a modulated FM signal is obtained to control the second sound light modulator 7, light frequency modulation on-1 diffraction level is carried out on a laser signal transmitted from the second polarization spectroscope 5, a frequency modulated laser is obtained and reaches the concave reflecting mirror 8, is reflected and focused to the second sound light modulator 7, and after being modulated again, the frequency modulated laser sequentially passes through the second polarization spectroscope 5, the lambda/4 wave plate 4 and the first sound light modulator 3 to reach the first polarization spectroscope 2, and is divided into two beams by one beam.
One beam passes directly through the first polarizing beam splitter 2 and returns to the laser vibrometer 1 to be used for laser vibrometer calibration.
The other beam is reflected by the plane reflector 12, passes through the lambda/2 wave plate 6 and the third polarization spectroscope 13 in sequence, and is subjected to beam combination and beat frequency interference with the laser which is sent from the second polarization spectroscope 5 and reflected by the third polarization spectroscope 13 at the third polarization spectroscope 13;
the other path of light reflected and split by the second polarization beam splitter 5 is reflected by the third polarization beam splitter 13, is combined with the laser passing through the third polarization beam splitter 13 in the direction of the lambda/2 wave plate 6, is subjected to beat frequency interference, reaches the photoelectric detector 14, and is read by the photoelectric detector 14 to obtain a radio frequency FM signal after beat frequency. The radio frequency FM signal is filtered and amplified by a filter amplifier 15, data is acquired by a data acquisition system 16, the radio frequency FM signal enters an electronic computer 17, and a standard vibration magnitude value and a vibration frequency value reproduced by a broadband laser vibration meter calibration device are obtained by using an FM signal demodulation algorithm, so that the aim of effectively tracing the magnitude value is fulfilled.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A tracing method of a broadband laser vibration meter calibrating device is characterized by comprising the following steps: the method comprises the steps of obtaining a laser Doppler vibration signal reproduced by a broadband laser vibration meter calibrating device in an external difference laser measuring mode, demodulating a simulated vibration magnitude signal waveform in a waveform measuring and FM signal demodulating mode, obtaining a standard value of a vibration parameter, and tracing the standard value to a time frequency magnitude value through a data acquisition system, thereby achieving magnitude tracing of the broadband laser vibration meter calibrating device.
2. The utility model provides a wide band laser vibrometer calibrating device's device of tracing to source which characterized in that: the device comprises a laser vibration meter (1), a first polarization spectroscope (2), a first acousto-optic modulator (3), a lambda/4 wave plate (4), a second polarization spectroscope (5), a lambda/2 wave plate (6), a second acousto-optic modulator (7), a concave reflector (8), a first sinusoidal signal source (9), an FM signal source (10), a second sinusoidal signal source (11), a plane reflector (12), a third polarization spectroscope (13), a photoelectric detector (14), a filter amplifier (15), a data acquisition system (16) and an electronic computer (17);
laser generated by a laser vibration meter (1) passes through a first polarization spectroscope (2) and reaches a first acousto-optic modulator (3), the first acousto-optic modulator (3) controlled by a sinusoidal signal generated by a first sinusoidal signal source (9) performs +1 diffraction order frequency shift on the laser from the first polarization spectroscope (2), then passes through a lambda/4 wave plate (4), and is divided into two paths by one path after reaching a second polarization spectroscope (5);
one path of the laser light is transmitted light and reaches the second sound light modulator (7), the second sine signal source (11) generates sine waves with frequency omega, the FM signal source (10) is subjected to frequency modulation to obtain modulated FM signals to control the second sound light modulator (7), the laser signals transmitted from the second polarization spectroscope (5) are subjected to light frequency modulation on-1 diffraction level to obtain frequency-modulated laser, the frequency-modulated laser reaches the concave reflector (8), is reflected and focused to the second sound light modulator (7), passes through the second polarization spectroscope (5), the lambda/4 wave plate (4) and the first sound light modulator (3) after being modulated again, reaches the first polarization spectroscope (2), and is divided into two beams by one beam;
one beam directly passes through the first polarization spectroscope (2) and returns to the laser vibration meter (1) to be used for calibrating the laser vibration meter;
the other beam is reflected by the plane reflector (12), sequentially passes through the lambda/2 wave plate (6) and the third polarization spectroscope (13), and is combined with laser beams which are sent from the second polarization spectroscope (5) and reflected by the third polarization spectroscope (13) at the third polarization spectroscope (13) to perform beat frequency interference;
the other path of light reflected and split by the second polarization beam splitter (5) is reflected by a third polarization beam splitter (13), is subjected to beam combination and beat frequency interference with laser which is from the direction of a lambda/2 wave plate (6) and passes through the third polarization beam splitter (13), reaches a photoelectric detector (14), and a radio frequency FM signal after beat frequency is read by the photoelectric detector (14); the radio frequency FM signal is filtered and amplified by a filter amplifier (15), data is acquired by a data acquisition system (16), the radio frequency FM signal enters an electronic computer (17), and a standard vibration magnitude value and a vibration frequency value reproduced by a broadband laser vibration meter calibrating device are obtained by using an FM signal demodulation algorithm, so that the magnitude value of the broadband laser vibration meter calibrating device is effectively traced.
3. The apparatus according to claim 2, wherein the source tracing device comprises: and respectively extracting vibration laser signals by using a first polarization beam splitter (2) and extracting frequency shift laser signals by using a second polarization beam splitter (5) to carry out beam combination and beat frequency to obtain FM signal waveforms in a radio frequency range.
4. The apparatus according to claim 2, wherein the source tracing device comprises: the first acousto-optic modulator (3) and the second acousto-optic modulator (7) are used, the frequency shift and modulation of which can work not only on the + -1 st diffraction order, but also on the + -2 nd diffraction order and the + -3 rd diffraction order, respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210381883A1 (en) * | 2020-06-05 | 2021-12-09 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Calibration apparatus and calibrating a laser doppler vibrometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210381883A1 (en) * | 2020-06-05 | 2021-12-09 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Calibration apparatus and calibrating a laser doppler vibrometer |
| US11906350B2 (en) * | 2020-06-05 | 2024-02-20 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Calibration apparatus and calibrating a laser doppler vibrometer |
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