An optical fiber sensor humidity measurement calibration device and method

Abstract

The invention discloses an optical fiber sensor humidity measurement calibration device and an optical fiber sensor humidity measurement calibration method. The device comprises a calibrated optical fiber sensor humidity measurement mainframe, a constant-temperature constant-humidity chamber and an optical coupler chamber. The optical fiber sensor humidity measurement mainframe is connected with an analysis computer which is used for calibrating humidity compensating parameters of the optical fiber sensor humidity measurement mainframe. The optical coupler chamber is provided with an optical fiber collimator and a PIN photodiode, the optical fiber collimator and the PIN photodiode are arranged on a horizontal guide rail to guarantee coaxiality of the collimator and the photodiode, the optical fiber collimator emits light, and the PIN photodiode receives the light and converts the light into electrical signals. A controller controls the PIN photodiode to horizontally move on the horizontal guide rail so as to adjust a distance between the PIN photodiode and the collimator. The optical coupler chamber is arranged in the constant-temperature constant-humidity chamber, and an optical fiber cable is connected with the measurement mainframe and the collimator. By means of changing of air chamber distance, equivalent humidity changing is realized, and quick and stable calibration of TDLAS (tunable diode laser absorption spectroscopy) humidity sensors is realized.

Description

technical field [0001] The invention belongs to sensor detection and calibration, in particular to an optical fiber sensor humidity measurement calibration device and method, which is a sensor measurement humidity calibration device and method using TDLAS technology. Background technique [0002] Humidity calibration generally provides a stable humidity environment through a humidity generator, and then changes different temperatures and different humidity points to change the humidity environment in the generator to provide humidity sensor humidity calibration and calibration. This method is only suitable for normal temperature and humidity calibration at 10°C~20°C, and when used in low temperature environment or high temperature environment, the instability of the humidity environment will increase, and even the environment cannot be stabilized. In addition, even if it is calibrated in the range of normal temperature and humidity, it takes 1 hour for the temperature to sta...

AI Technical Summary

Problems solved by technology

This method is only suitable for normal temperature and humidity calibration at 10°C~20°C, and when used in low temperature environment or high temperature environment, the instability of the humidity environment will increase, and even the environment cannot be stabilized.

In addition, even if it is calibrated in the range of normal temperature and humidity, it takes 1 hour for the temperature to stabilize, and at least 30 minutes for the humidity to stabilize. If it is 5-point calibration, it takes at least 3 hours. The time is long and the calibration efficiency is low.

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