Title:
LASER DOPPLER SPEED METER
Document Type and Number:
Japanese Patent JP3049849
Kind Code:
B2
Abstract:
PURPOSE: To enable a device to be miniaturized by simplifying a signal- processing circuit system and reducing a size of a substrate, and enable an unneeded signal which is generated halfway through the signal processing to be eliminated, and sensitivity for detecting speed to be improved.
CONSTITUTION: A light beam is emitted to an object to be measured for obtaining its reflection light and at the same time the light beam is input to phase modulators 23 and 24 where sinusoidal signals with different frequencies are applied, thus obtaining first and second reference lights. A laser Doppler speed meter 20 is constituted so that two synthesized lights which are obtained by allowing a reflection light to be synthesized to the first and second reference light are converted to a light-detection signal by light-detection means 29 and 30 and a speed of the object to be measured is measured based on a sum of these lightdetection signals.
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Inventors:
Minoru Hashimoto
Yoshio Ohashi
Yoshio Ohashi
Application Number:
JP17894291A
Publication Date:
June 05, 2000
Filing Date:
June 25, 1991
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G01S17/58; (IPC1-7): G01S17/58
Domestic Patent References:
| JP52075A | ||||
| JP610687B2 |
Other References:
【文献】特許2829966(JP,B2)
【文献】特許2779038(JP,B2)
【文献】特許2689503(JP,B2)
【文献】特許2779038(JP,B2)
【文献】特許2689503(JP,B2)
Attorney, Agent or Firm:
Atsuo Waki