Research Projects

• In the recent era, cryogenic liquids are used in the research related to the field of frozen storage and experimentation, chemical processing and fuel management. So, cryogenic liquid level sensing is an important aspects both on the ground and in space. To measure the amount and level of liquid fuel in space, many electrical sensors and connections are required. Till now, various fiber optic liquid level sensors have been proposed by using cladding less fiber , long period grating , Fiber Bragg grating , tilted fiber Bragg grating etc. But the sensitivities of all these sensors are limited due to the smaller modal overlap between the guided modes and the cladding material which is to be sensed. • In this project, an ultra-high sensitive multimode interference based, scalable fiber optic cryogenic liquid level sensor is proposed, where Gaussian and Non-Gaussian beam is used as the input source in a higher order mode-no core-higher order mode (HNH) fiber configuration. The key advantage of the proposal is that the sensitivity of the sensor can be improved to a great extent by only changing the input beam from Gaussian and Non-Gaussian Beam instead of any change in waveguide dimension like tapering or U-bent. • With the proposed approach irradiating non Gaussian beam, the discerned sensitivity is 4.517 dB/°K, 18458.8 dB/RIU, 9.759 dB/cm, and 0.176 dB/nm, with a resolution of 5.5×10-7 RIU. This is 3.8 times more sensitive than the published ray theory-based publications till date that are based on the Gaussian beam. • This idea expedites significantly the advancement in the sensor technology for critical applications in various industrial sectors including various petroleum and chemical industries, biological purposes, aerospace applications, steam and feed water systems, or any water treatment systems.