Dry-wet method temperature and humidity sensing probe adopting fiber grating sensors

Abstract

The invention discloses a dry-wet method temperature and humidity sensing probe using an optical fiber grating sensor, which is widely used in the technical field of environmental parameter monitoring. The technical solution is: the probe is composed of a base plate, a water tank, an outer shield, a humidity drainage line, a fiber grating temperature sensor, a fiber grating humidity sensor, and a tail cable. The fiber grating temperature sensor uses fiber grating to sense the external temperature change, and the fiber grating humidity sensor uses the dry-wet comparison method to measure the relative humidity of the environment. The probe is used together with the fiber grating temperature and humidity sensor, which can realize the passive and all-optical sensor end, and has the function of wavelength division multiplexing and remote signal transmission.

Description

1. Technical field: [0001] Environmental parameter monitoring technology field 2. Technical background: [0002] At present, the temperature and humidity sensor probes produced by various companies at home and abroad mainly include general products such as dry and wet bulb temperature and humidity probes composed of mercury thermometers, humidity sensitive resistance temperature and humidity probes, and humidity sensitive capacitive temperature and humidity probes. Fiber grating has not yet been adopted. A temperature and humidity probe that combines the sensor and the wet and dry method. The wet and dry bulb temperature and humidity probe technology is relatively mature. It mainly uses dry and wet mercury thermometers to form a dry hygrometer. The relative humidity value in the air is measured by the look-up method. This type of thermometer and hygrometer has low cost and stable performance. However, the thermometer and hygrometer can only be used independently for each probe, ...

AI Technical Summary

Problems solved by technology

However, the temperature and humidity meter can only be used independently by each probe, and can only rely on manual data reading and recording. The convenience in use is poor, the labor cost is high, and it is impossible to use multi-sensing probes in a network and remotely monitor temperature and humidity data. Transmission and other functions do not meet the conditions for intelligent use

The resistive and capacitive temperature and humidity sensing probes sense temperature and humidity data through temperature-sensitive and humidity-sensitive electronic components. They need power supply during use, and data transmission also requires power supply and related cables to assist, so it cannot be sensed. The terminal is passive, and the electronic device is sensitive to the use environment, and it is easy to age after long-term use, resulting in a decrease in accuracy

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