A Compact Programmable Laser Doppler Velocimeter for Marine Applications

reportActive / Technical Report | Accession Number: ADA226266 | Open PDF

Abstract:

This second Progress Report covers the period of 30 June to 30 August 1990. During this period we have constructed the LDV breadboard and have commenced acquiring data. The breadboard, which is schematically shown on Figure 1, is capable of measuring two velocity components in a backscattering configuration. The primary components are a 40 mW diode laser which operates at 815 nm, three Bragg cells with respective frequencies of 75, 80, and 90 MHz, and an avalanche photodiode module developed at MetroLaser. In addition to the LDV breadboard, we also developed a test cell with a recirculating centrifugal pump which is capable of producing velocities of up to 8 ms. The test cell is filled with water and polystyrene particles of 8 microns in diameter. During the remaining two months of this program we expect to refine the performance of the breadboard, acquire data for a variety of flow conditions, and evaluate the performance of the system, especially as it relates to sensitivity and signal to noise ratio.

Author(s):
Hess, Cecil F.
Author Organization(s):
METROLASER IRVINE CA
Descriptive Note:
Technical progress rept. no. 2, 30 Jun-30 Aug 1990
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00014-90-C-0105
Monitor Series:
ONR
 Subject Terms
Modernization Areas:
Autonomy
Communities of Interest:
Autonomy
Descriptor(s):
*BACKSCATTERING, *AVALANCHE DIODES, *LASERS, POLYSTYRENE, SIGNAL TO NOISE RATIO, MODULAR CONSTRUCTION, TEST EQUIPMENT, PARTICLES, CONFIGURATIONS, BREADBOARD MODELS, FLOW, BRAGG ANGLE, CELLS, WATER, DIODES, MEASUREMENT
Field(s)/Group(s):
Lasers and Masers, Test Facilities, Equipment and Methods
Report Date:
1990 Aug 30