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本文介绍了超小型电涡流测速装置。该装置应用通以高频电流的线圈在接近导体时产生涡流损耗而引起线圈电感量的改变这一原理。将转速信号变成了电感量的变化。将线圈作为振荡器的一个原件和其它原件组成电容反馈式LC振荡器。线圈电感量的改变引起振荡器振荡频率的变化。振荡器输出的信号为调频信号。这一调频信号经过放大整形、鉴频、转速信号放大与整形等环节得到转速脉冲信号。本装置具有无摩擦、无损耗、抗干扰能力强、使用方便、测量精确等特点。其最突出的特点是使传感头超小型化(只有ф2.5),填补了国内空白。
This article describes the ultra-small eddy current velocity measurement device. The principle of this device is that the coil with high frequency current generates eddy current loss when the coil approaches the conductor, causing the inductance of the coil to change. Turn the speed signal into a change in inductance. The coil as an oscillator and other components of the original capacitance feedback LC oscillator. The change in the inductance of the coil causes the oscillation frequency of the oscillator to change. Oscillator output signal for the FM signal. This FM signal undergoes amplification and shaping, frequency discrimination, speed signal amplification and shaping and other aspects of the speed pulse signal. The device has no friction, no loss, anti-interference ability, easy to use, accurate measurement and so on. Its most prominent feature is the miniaturization of the sensor head (only ф2.5), to fill the gaps in the country.