Device and method for measuring height of micro-amplitude liquid surface wave in real time
A liquid surface, real-time measurement technology, used in measurement devices, liquid/fluid solid measurement, liquid level indicators, etc., can solve the problem of inability to accurately measure the amplitude of micro-amplitude liquid surface waves, and achieve simple structure, high precision, and precision. high effect
Active Publication Date: 2014-04-02
ZHEJIANG UNIV
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[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a real-time measuring device and method for measuring the height of the micro-amplitude liquid surface wave. The method is used for real-time measurement of the amplitude of the micro-amplitude liquid surface wave. The problem that the method cannot accurately measure the amplitude of the micro-amplitude liquid surface wave, and the present invention also has the same measurement effect for shallower transparent liquids
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[0016] figure 1 It is a schematic diagram of the measurement principle of the present invention. The laser 101 emits laser light vertically upward from the bottom of the transparent liquid tank 102. After the laser light emerges from the liquid surface, the light oscillates with the surface waves of the liquid, and the emitted light hits the photoelectric light placed horizontally at a distance L above the liquid surface. The photosensitive surface of the position sensor 103 .
[0017] The waveform of the micro-amplitude liquid surface wave is approximately a sine wave, and the trace of the wave surface undulation can be used A sin( kx-ωt+δ ) means, in the formula, A is the liquid surface wave amplitude, x is the position coordinate in the propagation direction of the liquid surface wave, k is the wave number, ω is the angular frequency of the liquid surface wave, t for time, δ is the initial phase of the liquid surface wave. Depend on figure 1 It can be known th...
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The invention discloses a device and a method for measuring the height of a micro-amplitude liquid surface wave in real time. The device comprises a laser, a transparent liquid tank, a photoelectric position sensor, a translation frame, a rocker, a screw, a slide rail, an oscilloscope and a fixed nut; the fixed nut is fixed on the slide rail; the screw is screwed with the fixed nut by screw threads; one end of the screw is sleeved with the translation frame arranged on the slide rail; the screw can rotate at the sleeving position and can drive the translation frame to translate; the other end of the screw is fixedly connected with the rocker; the top and the bottom of the translation frame are respectively provided with horizontally extended frame arms; the photoelectric position sensor and the laser are arranged on the inner lateral surfaces of the two frame arms in an up-and-down over-against manner; the signal output end of the photoelectric position sensor is connected with the oscilloscope. The device and the method are used for carrying out non-contact high-accuracy real-time measurement on the characteristics of the liquid surface wave, such as the wave amplitude and frequency of the micro-amplitude liquid surface wave, and solve the problem that in the prior art, a laser refraction method cannot accurately measure the wave amplitude of the micro-amplitude liquid surface wave.
Description
technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a measuring device and a measuring method based on a photoelectric position sensor and a semiconductor laser for measuring liquid surface wave height and vibration frequency. Background technique [0002] At present, there are mainly two types of contact measurement methods for liquid surface wave height: buoy type and probe type. The buoy-type measurement principle is that when the buoy body fluctuates with the waves, the built-in vertical acceleration sensor will output a signal reflecting the change of the acceleration of the wave surface, and the real-time measurement of the wave height can be realized by processing and calculating the signal; while the probe-type measurement is It is measured by the principle that the capacitance, resistance or pressure in the liquid changes linearly with the change of the liquid level. Whether it is a buoy or a ...
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IPC IPC(8): G01F23/292
Inventor 王振宇聂晓飞李富强
Owner ZHEJIANG UNIV
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