Temperature and pressure integrated sensing device based on high birefringence photonic crystal fiber surface plasmon resonance and measuring method thereof

Abstract

The invention provides a temperature and pressure integrated sensing device based on high birefringence photonic crystal fiber surface plasmon resonance and a measuring method thereof. The sensor includes a wide spectrum light source, a fiber connector, a common single-mode fiber, a high birefringence plated film photonic crystal fiber and a spectrometer. The external temperature and the pressureof the high birefringence plated film photonic crystal fiber are judged through surface plasmon resonance wave spectrums detected by the spectrometer. In a condition of a certain pressure, when the external temperature of the sensor increases, the resonance wavelength is reduced; when the external temperature drops, the resonance wavelength is increased. In a condition of a certain temperature, when externally applied pressure of the sensor increases, the resonance wavelength is increased; when the externally applied pressure is reduced, the resonance wavelength is reduced. A light source is replaced by the light source the wavelength of which is close to a surface plasmon resonance wavelength, and a loss spectrum analysis method is utilized to determine a position where surface plasmon resonance occurs. According to the invention, the external temperature and the pressure can be analyzed and detected once at the same time.

Description

technical field [0001] The invention relates to a temperature and pressure integrated sensing device, and the invention also relates to a temperature and pressure measurement method. In particular, a temperature and pressure integrated sensing device based on surface plasmon resonance of a high birefringence photonic crystal fiber and a measurement method thereof. Background technique [0002] Surface Plasmon Resonance (SPR) is a very popular new optical sensing technology in recent years. Because of its advantages of no need for marking, high sensitivity, anti-electromagnetic interference, and real-time monitoring, it is widely used in biomedicine, environmental pollution, food, and so on. It has broad application prospects in many fields such as safety and petrochemical industry. In recent years, with the continuous maturity of optical fiber drawing technology, the optical fiber surface plasmon resonance sensor is extremely sensitive to small changes in the refractive ind...

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Problems solved by technology

However, the above photonic crystal fiber SPR sensors only complete the detection of a single SPR, and can only detect one property at a time, which limits its application to a certain extent.

[0004] In the prior art, the patent document with the publication number CN202267563U provides a sensor for measuring temperature and pressure using electrical principles, which not only measures temperature and pressure simultaneously, but also realizes the isolation of the pressure sensing chip through a stainless steel diaphragm, which expands the However, due to the long heat conduction process and large heat loss, there is a temperature difference between the measured medium temperature and the actual temperature, and the measurement result is not accurate

Although the technical solution disclosed in the patent document with the publication number CN201795879U has high precision, potting must be carried out to ensure the airtightness of the product, and the potting process is complicated, resulting in low production efficiency

The technical solution disclosed in the patent document with the publication number CN105466483A needs to set the sensitive devices of the thermistor, PCB board and pressure chip adjacent to it at the same time in a small space. Although this type of sensor has high precision, it cannot resist electromagnetic interference in real time and online detection, which limits its application

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