19 August 1997 Comparison of receiver channels for a fast TOF laser radar
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Abstract
In this paper two types of high-bandwidth receiver channels for a time-of-flight laser radar are presented. The purpose was to increase the bandwidth of the receivers compared to the previously used BW approximately 100 MHz receiver channels to improve the single-shot resolution of the laser radar. Both of the new receivers consist of a transimpedance preamplifier followed by two voltage amplifier stages, all commercial components. One of them is equipped with a prototype GaAs-MSM diode and the other utilizes a commercially available avalanche photodiode or a PIN diode as the photodetector. The performances of both amplifier channels were measured. The upper limit of the noise bandwidth fmax of receiver channel 1 was about 820 MHz and its calculated transimpedance was 150 k(Omega) . The measured noise current reduced to input was 7.4 pA/(root)Hz. Receiver channel 2 had a total fmax of 800 MHz and noise current of 7.5 pA/(root)Hz. Its calculated transimpedance was 130 k(Omega) . The performance of receiver channel 2 was measured using it as a receiver channel in a single channel laser radar. In the pulser an avalanche transistor and a SH laser operating in gain switching mode were used. The width of the optical pulse was 2.3 ns and rise time was 900 ps measured with receiver channel 2. The timing principle utilized both leading and trailing edges of the pulse. The single-shot measurement resolution was 28.5 ps with receiver channel 2 while the signal-to-noise-ratios of the start and stop pulses in the channel were 80 and 56.
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Ari Kilpelae, Ari Kilpelae, Juha Tapio Kostamovaara, Juha Tapio Kostamovaara, } "Comparison of receiver channels for a fast TOF laser radar", Proc. SPIE 3101, New Image Processing Techniques and Applications: Algorithms, Methods, and Components II, (19 August 1997); doi: 10.1117/12.281284; https://doi.org/10.1117/12.281284
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