Liquid surface wave detecting method and device based on scattering laser Doppler effect
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A Doppler effect, liquid surface technology, applied in the field of liquid surface wave detection, can solve problems such as difficult adjustment, and achieve the effects of easy adjustment, flexible optical path, and high detection sensitivity
Inactive Publication Date: 2010-05-19
HARBIN INST OF TECH
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[0003] The object of the present invention is to provide a liquid surface wave detection method and device based on the scattered laser Doppler effect, which solves the problem of receiving the main reflected light in the existing laser interference technology for measuring the frequency and amplitude of the liquid surface wave. And it is required that the angle of the optical path output and the receiving part be strictly matched, and the adjustment is difficult
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specific Embodiment approach 1
[0017] Specific implementation mode one: this implementation mode comprises the following steps:
[0018] Step 1: Use a low-frequency signal generator to output a standard sine wave to drive the surface wave exciter to generate surface waves on the surface of the liquid to be tested;
[0019] Step 2: irradiating the surface wave generated on the surface of the liquid to be measured in step 1 with a laser, so that the scattered light carrying the surface wave information of the liquid to be measured is used as signal light to interfere with the reference light to obtain interference light;
[0020] Step 3: Receive the light intensity signal of the interference light obtained in step 2 with a photoelectric receiver, obtain the AC photoelectric signal U from the time domain waveform output by the photoelectric receiver, and demodulate the AC photoelectric signal U to obtain the liquid to be tested the frequency of surface waves;
[0021] Step 4: Eliminate the trend item and smoo...
specific Embodiment approach 2
[0045] Specific implementation mode two: the following combination Figure 1-Figure 4 Describe this embodiment, this embodiment is by low-frequency signal generator 1, surface wave exciter 2, liquid pool 3 that liquid to be measured is housed, laser 4, quarter-wave plate 5, polarization beam splitter 6, attenuation plate 7 , a half-wave plate 8, a beam splitter 9, a filter 10, a photoelectric receiver 11, a data acquisition and processing system 12, a first mirror 13, a telescopic system 14 and a second mirror 15,
[0046] The frequency signal output end of the low-frequency signal generator 1 is connected to the frequency signal input end of the surface wave exciter 2, and the output of the surface wave exciter 2 makes the liquid surface of the liquid pool 3 containing the liquid to be measured generate surface waves;
[0047] The linearly polarized light output by the laser 4 passes through the quarter-wave plate 5 to obtain circularly polarized light, and the p-polarized li...
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Abstract
The invention relates to liquid surface wave detecting method and device based on a scattering laser Doppler effect, belonging to the field of detection of liquid surface waves. The invention solves the problems of main reflecting light receiving, strict matching of angles of a light path output part and a light path receiving part and large adjusting difficulty in a laser interference technology of the traditional liquid surface wave measurement. In the method, a coherent laser beam irradiates the surface of liquid; after receiving an interference light signal, a photoelectric receiver outputs a time domain oscillogram to obtain an alternating current photoelectric signal, and the alternating current photoelectric signal is demodulated to obtain the frequency of a surface wave; and an amplitude of the liquid surface wave is calculated and obtained by a Doppler frequency shift value on a frequency spectrum analysis chart converted by the time domain oscillogram. The device comprises a low-frequency signal generator, a surface wave excitation machine, a liquid pool, a laser, a quarter of wave sheet, a polarizing spectroscope, an attenuating sheet, a half of wave sheet, a spectroscope, a filter, a photoelectric receiver, a data acquiring and processing system, a first reflecting mirror, a telescopic system and a second reflecting mirror. The invention is used for the detection of the liquid surface wave.
Description
technical field [0001] The invention relates to a liquid surface wave detection method and device based on scattered laser Doppler effect, belonging to the field of liquid surface wave detection. Background technique [0002] Using optical methods to study wave properties is widely used in fluid mechanics, ocean optics, radar scattering, and liquid surface waves. Since the amplitude of the liquid surface wave is relatively small, it cannot be seen with the naked eye, which brings certain difficulties to the study of the properties of the liquid surface wave. There are different methods for measuring liquid surface waves in different frequency bands. For liquid surface waves with a frequency of several hundred Hz, Sakai has used the optical heterodyne method for research. Because this method requires high experimental equipment, it is generally difficult to achieve . Miao Runcai and others used the diffraction method to measure the physical properties of liquid surface wave...
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