| 摘要 |
PURPOSE: A sensor for detecting the stability of a carriage in an express train is provided by generating a frequency signal proportional to the absolute size of acceleration and transferring the frequency signal to the CPU of a controller. CONSTITUTION: A sensor for detecting the stability of a carriage in an express train comprises an acceleration detecting sensor(21), a signal detecting part, a signal transmission part, and a power supply part. The acceleration detecting sensor includes a MEMS sensor(31), an alternating amplifier(32), a demodulator(33), a output amplifier(34), and a capacitor(C1). The MEMS sensor can measure acceleration of -1.7G~+1.7G. The alternating amplifier amplifies the measurement acceleration value delivered from the MEMS sensor. The demodulator detects a frequency signal from the acceleration value amplified through the alternating amplifier. The output amplifier amplifies and outputs the frequency signal delivered from the demodulator. The capacitor connects to the output amplifier through a resistor(R1) to changes frequency.
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