Temperature- and strain- insensitive transverse load sensing based on optical fiber reflective Lyot filter

Abstract

For the first time to our knowledge, we propose and experimentally demonstrate a transverse load sensor using an optical fiber reflective Lyot filter. Such an optical fiber reflective Lyot filter consist of a fiber polarizer, a segment of polarization-maintaining fiber and a single mode fiber based fiber reflector. By demodulating the wavelength of the interference dip, the proposed device exhibits a desirable high transverse load sensitivity of 64.72 nm/(N/mm) without temperature and strain confusion, which provides a new option for the transverse load measurement and further expands the application of the fiber Lyot filter.

Cascaded polarizer-PMF-Fabry–Pérot structure with a tunable initial state for ultra-highly sensitive temperature measurement

“…At the end, the two polarized light beams reversely travel back and meet at the polarizer, then the polarization interference occurs, which is similar to the reflective Lyot filter. 29) Since the two beams pass through the PMF again, which is equivalent to doubling the length of the PMF, the total phase difference between the two polarized beams can be expressed as:…”

Highly Sensitive Temperature Sensor Based on All-Fiber Polarization Interference Filter With Vernier Effect

“…Among the numerous kinds of sensors, optical fiber sensor has attracted a lot of research interest due to its unique advantages such as simple structure, light weight, immunity to electromagnetic interference, etc. So far, a variety of optical fiber sensors with different techniques have been developed by researchers and successfully achieved the measurement of different parameters such as torsion [1,2], transverse load [3], temperature [4], gas pressure [5] and so on. Among the various parameters, temperature is an important physical parameter in all fields of natural science, industrial manufacture as well as most aspects of daily life.…”

Highly Precise Birefringence Demodulation to Overcome the Sensing Limitation From the Free Spectral Range on the Fiber Lyot Filter

“…In addition, it is noted that the above-mentioned sensors are mostly demodulated by the dip wavelength tracking method, which makes the measurement range of the interference type sensor limited to the free spectral range (FSR) and the observation window. The Lyot filter, with polarization interference, consisting of a birefringent cavity and two polarizers, has been extensively studied [11]. At present, a variety of Lyot filters have been developed for spectral imaging [12,13], optical communication [14], laser tuning [15,16] and fiber sensing [17][18][19][20].…”