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由我院参加研制,重庆煤矿安全仪器厂定型生产的AYJ—1型瓦斯遥测警报仪是一种脉冲频率制的遥测装置。本文着重分析遥测仪设计中的若干特殊问题,现将这些问题分述如下: 一、最低脉冲频率Fmin与最高脉冲频率Fmax的确定 在脉冲频率制瓦斯遥测系统中,瓦斯传感器将瓦斯浓度转换为与之成正比的电压值,然后经过差分放大器放大,又经过电压—频率转换器(V—F转换器)将电压转换为与瓦斯浓度成正比的脉冲频率,此脉冲频率调制在载波频率上发送出去,接收机将被调制的载波讯号
AYJ-1-type gas telemetry alarm instrument, which is produced by our institute and developed by Chongqing Coal Mine Safety Instrument Factory, is a telemetering device with pulse frequency. This paper focuses on the analysis of a number of special problems in the design of telemetry, these issues are now described as follows: First, the minimum pulse frequency Fmin and the maximum pulse frequency Fmax determination In the pulse frequency gas measurement telemetry system, gas sensors to gas concentration conversion and Is proportional to the voltage value, and then amplified by a differential amplifier, but also through the voltage - frequency converter (V-F converter) to convert the voltage proportional to the gas concentration and pulse frequency, the pulse frequency modulation sent on the carrier frequency , The receiver will be modulated carrier signal