Accession Number:

AD0266448

Title:

VELOCITY MEASURING SYSTEM EMPLOYING MODULATED LIGHT DOPPLER TECHNIQUES

Descriptive Note:

Corporate Author:

ELECTRO-OPTICAL SYSTEMS INC PASADENA CALIF

Personal Author(s):

Report Date:

1961-06-01

Pagination or Media Count:

127.0

Abstract:

A high accuracy, wide band velocity measuring system is described employing modulated light Doppler techniques. The system measures the sled velocity at the Holloman Track. A Kerr cell operating on the 4th harmonic of a 7.5 mc modulating voltage is employed as a light modulator. The Doppler information is carried on the 30 mc modulation a process of frequency multiplication of the received signal allows the velocity averaging distance to be reduced from one-half wavelength 5 meters to 5 cm. After data reduction the system is capable of measuring the velocity of the sled to 1 part in 100,000 with a 50 c bandwidth. This accuracy is maintained for all sled velocities from 10 meters per second to above 5000 feet per second. A reduction in bandwidth to 25 c allows this range of measurements to be xt nded down to 2.5 meters per second. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE