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121. 实用新型

JPS647347Y2 失效
公开(公告)号：JPS647347Y2
公开(公告)日：1989-02-27
申请号：JP16079683
申请日：1983-10-18
IPC分类号： G01P5/00 , G01P3/36 , G01S7/48 , G01S17/58

122. 发明专利

JPS643584A LASER DOPPLER TYPE SPEED MEASURING INSTRUMENT 失效
公开(公告)号：JPS643584A
公开(公告)日：1989-01-09
申请号：JP15995987
申请日：1987-06-26
申请人： BROTHER IND LTD
发明人： HINO MOTOHITO
IPC分类号： G01S17/58 , G01P5/00
摘要： PURPOSE:To improve measurement sensitivity by providing interactive projecting means which project 1st laser light >=2 times to an object to be measure so as to subject said light to >=2 times of Doppler shifts. CONSTITUTION:Of the laser light (Lz+Lx) outputted fro a laser apparatus 10, the laser light Lx advancing rectilinearly in a polarizing beam splitter 16 is circularly polarized by a quarter-wave plate 22 and is reflected in a Z direction by a plane mirror 24 so as to be imaged by a condenser lens 26 to one point on the object 28 to be measured. The reflected light Lx* reflected by the surface of the object 28 to be measured is again entered to the condenser lens 26 by passing the reflection optical pat symmetrical with the incident optical pat around the optical axis P of the lens 26. This light is reflected by the mirror 30 to return backward in the previously passed optical path, is reflected by the object 28, is further passed through the lens 26, is reflected by the mirror 24 toward the X direction, is converted to the linearly polarized light of the Z direction by the plate 22 and is entered to the splitter 16. Since the laser light is reflected twice by the object 28, the laser light is subjected to 2 times of the Doppler shifts and the frequency deviation is detected by a photodetecting element 32.

123. 发明专利

JPS63200084A LASER DOPPLER SPEEDOMETER 失效
公开(公告)号：JPS63200084A
公开(公告)日：1988-08-18
申请号：JP3269487
申请日：1987-02-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： TASHIRO HIDEO
IPC分类号： G01S17/58
摘要： PURPOSE:To reduce the speed measuring error accompanied by the variation in a measured distance, by providing a collimator lens behind a single mode type transmitting optical fiber cable. CONSTITUTION:The laser beam emitted from a laser 2 is transmitted to a single mode optical fiber cable 11 having a core diameter of about 6mum and the laser beam emitted from the terminal 12 of said cable 11 is made parallel by an collimator lens 13 having a focal distance (f). The output beam of the lens 13 is split into two by a half mirror 14 and the reflected beam of the mirror 14 is reflected by a mirror 15. The transmitted beam of the mirror 14 and the reflected beam of the mirror 15 cross on a moving body 1 each other at a crossing angle phi. By matching the distance from the end surface of the terminal 12 to the lens 13 with the focal distance (f) of the lens 13, the beam expanse angle of the output laser beam of the lens 13 can be set to about 0.3mrad or less and the speed measuring error accompanied by the variation in a measured distance generated in dependence on said expanse angle can be reduced.

124. 发明专利

JPS63191989A LASER DOPPLER SPEEDOMETER 失效
公开(公告)号：JPS63191989A
公开(公告)日：1988-08-09
申请号：JP2432587
申请日：1987-02-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： TASHIRO HIDEO
IPC分类号： G01S17/58
摘要： PURPOSE:To suppress a deviation in wavelength with temperature and to reduce errors in speed measurement by controlling a semiconductor laser to constant temperature. CONSTITUTION:A heat-sensitive element 12 detects the temperature of the semiconductor laser 2 and inputs it to an error amplifier 13. The amplifier 13 compares it with reference temperature T0 and the power amplification of the difference signal is performed to drive an electrothermal converter 15. The converter 15 is composed of a Peltier element; and one side of the element is joined with the laser 2 and heat is radiated from the other. When the temperature of the laser 2 is higher than a reference temperature T0, a positive current flows to the converter 15 to cool the laser, but when the temperature is lower, on the other hand, a negative current flows to heat the laser 2, which is controlled to the constant temperature T0 at all times. Thus, speed measurement errors due to a wavelength deviation are reduced.

125. 发明专利

JPS63191988A LASER DOPPLER SPEEDOMETER 失效
公开(公告)号：JPS63191988A
公开(公告)日：1988-08-09
申请号：JP2432487
申请日：1987-02-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： TASHIRO HIDEO
IPC分类号： G01S17/58
摘要： PURPOSE:To reduce errors in speed measurement due to a deviation in wavelength caused by temperature variation by detecting the temperature of a semiconductor laser and multiplying a speed measured value by a compensating coefficient corresponding to the temperature. CONSTITUTION:A laser beam from a semiconductor laser 2 is passed through a collimator lens 4 and split by a beam splitter 5 into two, and a moving body 1 is irradiated with those beams in the mutually opposite directions in crossing relation through mirrors 6a and 6c; and scattered light is inputted to a frequency tracking device 10 through a condenser lens 7, a photodetector 8, and an amplifier 9. The tracking device 10 detects a Doppler frequency and a speed computing element 11 computes the speed of the body 1. A heat-sensitive element 12, on the other hand, detects the temperature of the laser 2 and multiplies the speed measured value by a prescribed correcting coefficient corresponding to the temperature of a temperature correcting circuit 13. Consequently, the errors in speed measurement due to temperature variation are reducible.

126. 发明专利

JPS63131092A LASER LIGHT IRRADIATOR FOR SPEED MEASURING DEVICE USING LASER LIGHT 失效
公开(公告)号：JPS63131092A
公开(公告)日：1988-06-03
申请号：JP27753886
申请日：1986-11-20
申请人： NAKANO VINEGAR CO LTD
发明人： MORIMOTO HIROSHI , HATTORI SHUZO , MATSUDA FUMIO
IPC分类号： G01S17/58 , G01S7/48
摘要： PURPOSE:To enable the measuring of a moving speed at a high accuracy, by making a parallel diffraction light irradiate the surface of an object to be measured with the action of a first convex lens, a light shielding plate and a second convex lens. CONSTITUTION:When a parallel laser light is generated from a laser light source 22, a direct light (0-order light) passing intact through a slit of a diffraction grating 23 and primary, secondary lights... diffracted with the slit are emitted to a first convex lens 24. As these 0-order, primary lights and the like are parallel laser lights, they are diffracted with the lens 24 to be focusing at a position equivalent to a focal length of the lens 24. A light shielding plate 25 is arranged at the position and provided with a pair of transmitting holes to let the primary light alone pass. So, a pair of primary lights alone are made incident into a secondary convex lens 26 and diffracted to be emitted as a pair of parallel laser lights LB1 and LB2. The laser lights LB1 and LB2 interfere with each other to form a interference fringe on the surface of an object M to be measured. The scattered light with the interference fringe is processed 50 through a light receiver 40 to be detected as moving speed of the object M.

127. 发明专利

JPS6395372A MEASURING APPARATUS FOR UNEVEN ROTATION 失效
公开(公告)号：JPS6395372A
公开(公告)日：1988-04-26
申请号：JP24044486
申请日：1986-10-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： TASHIRO HIDEO
IPC分类号： G01S17/88 , G01P3/44 , G01S17/50 , G01S17/58
摘要： PURPOSE:To enable the removal of a nose synchronizing with a rotation frequency contained in an uneven rotation signal, by providing a limit amplifier behind an AC amplifier to suppress the amplitude of a Doppler signal to a constant level. CONSTITUTION:A laser light from a laser unit 2 is divided in two with a beam splitter 3 and one part thereof is changed in the direction with mirrors 4b and 4c while the other part thereof being done so with a mirror 4a to irradiate on a rotor 1, which causes positive and negative Doppler shifts. Then, the scattered light subjected to the Doppler shifts is introduced to a photo detector 6 through a lens 5 and converted into an electrical signal to be amplified 7. A Doppler signal as the output of the AC amplifier 7 is such that is modulated in the amplitude at a rotation frequency fm of the rotor 1 and has side wave components fd+ or -fm, fd+ or -2fm,..., fd+ or -nfm,... centered on the Doppler frequency fd. A limit amplifier 14 is disposed behind the amplifier 7 to suppress the amplitude of the Doppler signal to a constant level to eliminate amplitude modulation of the Doppler signal thereby enabling the removal of a noise contained in an uneven rotation signal.

128. 发明专利

JPS6390773A OPTICAL DOPPLER SPEED INDICATOR 失效
公开(公告)号：JPS6390773A
公开(公告)日：1988-04-21
申请号：JP23672786
申请日：1986-10-03
申请人： JAPAN AVIATION ELECTRON
发明人： ITO KAZUHIKO , AKAZAWA MASARU
IPC分类号： G01P5/00 , G01S17/58
摘要： PURPOSE:To accurately measure even the local speed distribution of a body to be measured by using a low coherence light source as a light source and providing an optical path length adjusting means which makes a difference in optical path length between two irradiating light beams. CONSTITUTION:The low coherence light source which has a coherence length of several to tens of micrometers is used. If there is a plane where two irradiating light beams are equal in optical path length in the crossing area, the measurable area 22 is a very limited area which is near by the plane of equal optical path length in the crossing area and corresponds to the coherence length. When there is no measurable area 22 in the crossing area 7, or when the area is large even if it is present, the optical path length difference adjusting means 21 adjusts the optical path length difference between the two irradiating light beams to set a small localized area as the measurable area 22. The optical path length difference adjusting means 21 stores a mirror 3 and a lens 5 on a mobile table and varies the distance between a beam splitter 2 and the mirror 3.

129. 实用新型

JPS62119681U 失效
公开(公告)号：JPS62119681U
公开(公告)日：1987-07-29
申请号：JP730986
申请日：1986-01-22
IPC分类号： G01S17/58

130. 发明专利

JPS62123379A DOPPLER RADAR 失效
公开(公告)号：JPS62123379A
公开(公告)日：1987-06-04
申请号：JP26352085
申请日：1985-11-22
申请人： HONDA MOTOR CO LTD
发明人： MURAO EIJI
IPC分类号： G01S13/60 , G01S17/58 , G01S17/93
摘要： PURPOSE:To certainly detect only a moving matter such as a forward running vehicle, by preliminarily adding beam, of which the fundamental frequency is shifted by Doppler frequency, correspondingly to the running speed of the own vehicle to remove the reflected beam component from a stationary object. CONSTITUTION:The laser beam Bo emitted from a laser apparatus 1 is distributed to two directions by a distributor 2 and the beam Bo distributed to one direction is incident to a matter 4 through a beam transmitting optical system 3 while the reflected beam Br from the matter 4 is incident to a beam synthesizer 7 through a beam receiving optical system 5. The other beam Bo distributed by the distributor 2 turns to laser beam Bt through a Doppler shifter 6 to be incident to the beam synthesizer 7. Both beams Br, Bt are synthesized by the synthesizer 7 and the synthesized beam Bm is converted to an electric signal Sm by a photoelectric converter 8 and the frequency of the signal conversion Sm is processed by a filter and amplifier 9 to obtain a signal S'm and frequency is measured on the basis of the signal S'm to output the signal Sv corresponding to the relative speed of the own vehicle and the matter 4 from frequency measuring device 10. By this method, only a moving matter such as a forward running vehicle can be certainly detected.

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