Abstract
Describes a hand-held, lithium battery operated, 30 mW laser diode, backscatter LDA constructed in a tube of 30 mm diameter and 250 mm length. The tube also contains micro-optical beam collimation, a miniature Galilean telescope, miniature beamsplitter and prism, spatial filtering, solid state detector, electronic amplifier, bandpass filter, discriminator and either (1) telemetry to transmit Doppler signals to a remote signal processor or (2) integral frequency analysis and LCD display of single-component velocity. All components are mounted on micro-optical benching. The velocity range is up to a few metres per second; the system operates for a few hours before battery replacement is necessary.
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