Distributed fibre-optic temperature sensor for cryogenic applications based on detection of boson components of Raman light scattering

Abstract

The possibility of designing a distributed fibre-optic sensor, allowing one to measure cryogenic temperatures (to liquid nitrogen boiling point), is experimentally demonstrated. The principle of operation of the sensor is based on measuring the intensity of boson peaks of Raman scattering in a fibre material, which are spaced by 1 to 3 THz from the probe frequency. The measurements are performed using a single-mode telecommunication fibre with a 15-μm-thick polyimide coating. The probe wavelength is 1.55 μm, the sensor spatial resolution is 4 m, and the averaging time is 60 s. Experiments are carried out in the temperature range of 75.6 – 79.6 K, with a temperature resolution of 0.5 K.

A Compact Source for a DAS without Trace Averaging based on a Low Phase Noise DDS and Mini-EYDFA

“…ISTIBUTED fiber optic sensors (DOFS) are becoming ubiquitous tools in many safety and integrity monitoring systems employed in various applications including the measurement of deformation [1], [2], [3], structural health monitoring (SHM) of concrete structures affected by internal swelling pathologies [4], and temperature monitoring [5]. Specifically, distributed vibrational frequency analysis is commonly used to detect spectral signatures of anomalies that necessitate pre-warning of infrastructure and device damages.…”

Scientific Applications of Distributed Acoustic Sensing: State-of-the-Art Review and Perspective

“…Distributed fiber sensors are used to measure the distribution of temperature [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], stress/deformations [ 22 , 23 , 24 ], or vibro-acoustic properties [ 25 , 26 , 27 , 28 , 29 , 30 ] of various objects. The last application allows more information about the investigated object to be obtained in contrast to the static measurement of temperature or stress.…”

Temperature and Magnetism Sensitivity of D-type Fiber Grating Filled with Magnetic Fluid in THz Band

“…Further optimize the sensor structure, the designed sensor performed the extreme relative sensitivity at 77.14 %, 78.06 % and 76.11 % at 1 THz for three chemicals [6]. In 2020, Gorshkov BG et al designed a distributed optical fiber sensor based on measuring the intensity of Raman scattering boson peak, which can measure the temperature in the range of 75.6 K∼79.6 K, with a sensitivity of 0.5 K [7]. It can be seen that optical fiber has excellent sensing characteristics in THz band.…”