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Double light path laser Doppler velocimeter capable of measuring speed for moving object of different distances

A moving object and distance technology, applied in the field of dual optical path laser Doppler velocimeter, can solve the problems of measurement system application limitations and achieve the effect of flexible application

Inactive Publication Date: 2007-03-07
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The main problem of this instrument is that the distance between the laser Doppler measurement system and the moving object to be measured is fixed, that is, the focus position of the dual optical path laser falls on the moving object, and the laser Doppler measurement system can only Measuring moving objects with a fixed distance to them, the application of the measuring system is limited

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  • Double light path laser Doppler velocimeter capable of measuring speed for moving object of different distances

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Embodiment Construction

[0012] The present invention is implemented according to the structural schematic block diagram shown in Fig. 2, the laser light source 5 adopts the He-Ne laser produced by Shanghai Asia-Pacific Technology Glass Co., Ltd., and the beam splitter and the photoelectric receiving and electronic processing display system 6 adopt the 1917C type produced by the U.S. TSI Company , the material of the movable mirror base 7 adopts LY12 aluminum, the movable lens 8 adopts K9 glass, biconvex lens, caliber φ=50mm, focal length f=188mm, fixed lens 9 adopts K9 glass, plano-concave lens, caliber φ=50mm, focal length f= -60mm, the material of the housing 10 is aluminum alloy, the moving object 11 to be measured can be a car, a train, a person riding a bicycle, etc., and the material of the ball screw 12 is 45 # Steel, Laser Rangefinder 14 with Leica Disto TM PRO4, the stepper motor 15 adopts a stepper motor with a step angle of 0.9°, and the stepper motor controller adopts the SC101 stepper mo...

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Abstract

A double-optical path laser Doppler velocimeter includes a laser source, a light source beam splitter, a photoelectric receive and electronic process system and a focusing system, among which, the laser source, the beam splitter, the photoelectric receive and electronic process display system, a mobile lens and a fixed lens in the focusing system are set on the optical axis of the propagating direction of the laser source beam orderly from left to right to compose a measurement system. The moving direction of the object and the axis of the test system are vertical to the optical axis of the laser ranger, a step motor controller drives the step motor to drive the ballscrew based on the distance of the tested moving object to regulate the distance between the mobile and the fixed lenses to let the laser beam focus drop on the tested moving object accurately.

Description

1. Technical field: [0001] The invention belongs to the technical field of laser measurement and relates to a dual-light-path laser Doppler velocimeter capable of measuring the speed of moving objects at different distances. 2. Technical background: [0002] The Doppler effect has long been known in the field of acoustics, and it was first discovered by the German physicist Doppler in the nineteenth century. An observer moving toward or away from a sound source encounters a change in the frequency of sound waves that is higher or lower than that encountered when standing still, producing a frequency difference. [0003] Einstein pointed out in his theory of relativity that a similar Doppler effect also exists in the field of light waves, and this effect can be used to measure the speed and displacement of moving objects. The laser Doppler effect is a concrete manifestation of the Doppler effect in the field of light waves. Laser Doppler measurement technology, especially v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58G01P3/36
Inventor 朱万彬
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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