Abstract
An ultrasensitive refractive index sensor for measuring the refraction index of gas inside the battery is proposed and demonstrated. The theoretical model of ultrasensitive parallel Fabry-Pérot interferometer (PFPI) is established, and the sensitivity amplification mechanism of the PFPI is analyzed in details. According to the matching conditions of optical path, a prefect matching scheme for measuring the refractive index of gas inside the battery is designed, and an ultra-high sensitivity gas refractive index sensor is fabricated. The sensitivity of the sensor is calibrated accordingly, and a preliminary test carried out inside the battery. The experimental results obtained show that the matching method realizes an ultra-high gas refractive index sensitivity of −120506.046 nm/RIU, and the amplification sensitivity is up to 78 times, and it has good response in detecting the gas state inside the cell, and can effectively detect the gas precipitation inside the cell, which can effectively, directly and in real time reflect the internal state of the battery. This technique of direct detection without the aid of other media has potential theoretical significance and practical application value in the field of gas precipitation detection in batteries.
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