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The design of a Raman lidar system for methane gas concentration measurements is described. The system measures concentrations in the 2–20% range in air at ranges from 100 m to 1 km with an accuracy of ±10%. Design criteria for the transmitter, receiver, scanner, and data acquisition subsystems are discussed. The primary components are an excimer laser source, a two-channel 0.5-m diam telescope, and a high-speed signal averaging circuit. Results of calibration measurements are presented.
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Houston et al. (1986) studied this question.
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