High-speed flying body laser speed-measuring method and instrument
A laser velocimeter and laser velocimetry technology are applied to devices using optical methods, radio wave measurement systems, and devices for measuring the time required to move a certain distance, which can solve the problems of inconvenient operation, complicated technology, and poor practicability problems, to achieve the effect of easy maintenance, convenient use and light weight
Inactive Publication Date: 2005-11-23
BEIJING UNIV OF TECH
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Problems solved by technology
[0004] (1) The target is not easy to catch: the Doppler velocimeter requires a beam of light to shine on the object to be measured, and then accepts that the scattered light interferes with the reference light, and measures the moving speed of the object by measuring the change of the interference fringe
When the object is small and moving at a high speed (for example: a bullet flying at high speed), the target is not easy to catch, so the speed measurement cannot be realized
[0005] (2) When the flying speed of the object is very high, the response speed of the Doppler speedometer is very high, which will undoubtedly increase the cost of the speedometer
For example: in order to measure flying objects with a speed of several kilometers per second and a size of only a few millimeters, the price of a Doppler speedometer is as high as more than one million yuan, and the technology is complex, inconvenient to operate, and very poor in practicability
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[0015] See attached figure 1 . A high-speed flying object laser velocimeter is assembled using conventional technology, wherein the semiconductor laser 1 is composed of laser power supply, cooling system, and laser diode. The wavelength of the output light can be 650nm red light or 808nm infrared light. The beam shaper 2 includes two parts: a horizontal beam section compressor and a vertical beam section expander, which respectively perform compression in the horizontal direction and expand in the vertical direction, so that the beam forms a thin layer of optical screen. After being split by the beam splitter 3 and reflected by the reflector 4, the beam forms two parallel optical screens. The focusing lens 5 is two groups of vertically placed lenses, which respectively converge the light beams on two groups of vertically placed photoelectric receivers 6 . The photoelectric receiver converts the optical signal into an electrical signal and transmits it to the low noise ampli...
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A laser speedometer for high-speed flying object is composed of laser device, beam shaper, splitter, reflectors, focusing lenses, photoelectric converters, low-noise amplifiers, level converters, logic analyzer, digital processor and digital display. Its measuring method is characterized by that the laser beams are reflected to form two laser curtains, when an object flys through them, the electric pulses are generated, and its flying speed can be calculated from the distance between two laser curtains and the time needed by flying through the distance. Its advantages are small size, light weight and low cost.
Description
technical field [0001] The laser speed measurement method and speedometer for high-speed flying objects are used to measure the flight speed of bullets and shells at the moment of launch, and to measure the speed of small high-speed flying objects such as baseballs and softballs that are thrown hard; table tennis balls and badmintons that are smashed vigorously. Background technique [0002] Velocimeters currently in use mostly measure velocity based on the Doppler effect. see the principle figure 2 As shown: the high-power laser 1 emits laser light, which is divided into two beams by the beam splitter 12, and one beam is expanded by the beam expander 13, and irradiated on the moving object 14, after being reflected by the surface of the moving object, it is focused by the objective lens 5, and then The light is irradiated onto the photoelectric converter 6 through the half mirror 15 . Another beam of laser light passes through the half-mirror 15 and is reflected to the ph...
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IPC IPC(8): G01P3/40
Inventor 李港白晓东陈檬
Owner BEIJING UNIV OF TECH