THE NEW FIBER-OPTIC TEMPERATURE SENSOR FOR GREENHOUSE

摘要

In this paper, we introduced a new fiber-optic temperature sensor with white light interferometric principle based on Fabry-Perot, which is capable of providing measurement for the temperature of greenhouse. The signal processing of system is that the optical signal wavelength is modulated in the Fabry-Perot cavity and is demodulated during the optical-electricity transform. Compared with a common optical fiber strain sensor, it has more advantages, such as low cost, high stability, and high anti-interference. The resolution of the fiber optical temperature sensor is up to 0.01 °C within the test range being -40°C ～100°C.The fiber-optic temperature sensor system made up of this fiber-optic temperature sensor is put into use in agriculture fields for monitoring in real time and absolute temperature measurement.