DTIC ADA228665: Meetopstelling van een Gepulste CO2 Laser Afstandsmeter met Heterodyne Detectie (Experimental Set-Up for a Pulsed CO2 Laser Range-Finder with Heterodyne Detection)

by: Defense Technical Information Center

Publication date: 1990-08-01

Topics: DTIC Archive, Bloem, J, FYSISCH EN ELEKTRONISCH LAB TNO THE HAGUE (NETHERLANDS), *RANGE FINDING, *SIGNAL PROCESSING, *PULSED LASERS, REFLECTION, TARGETS, LASERS, LASER APPLICATIONS, PULSES, RADIOFREQUENCY, LOCAL OSCILLATORS, FREQUENCY SHIFT, HETERODYNING, DETECTION, DIFFUSE REFLECTION, FREQUENCY,

Collection: dticarchive; additional_collections

Language: English

The realization is described of a pulse CO2 laser rangefinder with heterodyne detection. The realized system can be used to measure the range to (and in the future also the speed of) diffuse reflecting targets. The rangefinder uses a hybrid CW-TEA laser as emitter and an RF laser as local oscillator. The stabilization of these lasers is described in detail. The frequency offset between the transmitted laser pulse and the local oscillator laser is locked at 20 MHz. The long term (20 to 30 minutes) variation in this offset frequency is limited to 50 kHz. The effects of pulsing on this stabilization are eliminated. A start has been made with the signal processing. A rough model of the laser pulse and its frequency characteristics has been developed. An AM-demodulator is realized to determine the envelope of the reflected pulses. Keywords: Range finding; Laser applications.