调频型传感器有一系列突出的优点,又便于实现数字化。如果传感器没有实现线性化,其终端的数字仪表就不能直接给出被测物理量的数值,这显然是一个缺陷。在目前国内研制的一些海洋仪器中,这种情况还是常见的。要解决这个问题,就必须使传感器输出的频率和被测物理量之间具有线性的关系。本文讨论了调频用相移振荡器的原理,线性化的途径,介绍了一个线性化的调频型温度传感器。传感器用铂电阻作为敏感元件,输出频率讯号的非线性偏差≤0.04%,给测温带来的非线性偏差≤0.015℃。 FM sensor has a series of outstanding advantages, but also facilitate the realization of digital. If the sensor is not linearized, its terminal digital instrumentation can not directly give the measured value of the physical quantity, which is clearly a flaw. In the current domestic research and development of some marine instruments, this situation is still common. To solve this problem, we must make the sensor output frequency and the measured physical quantity has a linear relationship between. This article discusses the principle of FM phase-shifted oscillator, linear approach, introduces a linear frequency modulation temperature sensor. The sensor uses the platinum resistance as the sensitive element, the nonlinear deviation of the output frequency signal is less than or equal to 0.04%, and the non-linear deviation to the temperature measurement is less than or equal to 0.015 ° C.