| 摘要 |
A temperature sensor includes a permanent magnet placed on an object whose temperature is to be measured, a magnetically soft member located within the magnetic field of the magnet and an electrical coil placed around the magnetically soft member. The electrical coil is supplied with voltage pulses at one end while the other end is connected to a resistor in series to detect a voltage drop. The time lag of the voltage drop with respect to the voltage pulse is represented by an analog voltage or a digital code. A change in temperature changes the field strength of the magnet and hence the flux in the magnetically soft member. The coil senses the change in flux as a change in the time lag and thus measures the temperature.
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