Research on the Methods and Algorithms Improving the Measurements Precision and Market Competitive Advantages of Fiber Optic Current Sensors

Abstract

An electromagnetic instrument transformer is a common device used to measure large current values in high-voltage electrical networks; it has been in use for more than a century. However, the optical current transformer, a promising technology also known as a fiber optic current sensor (FOCS), offers increased safety and ease of operation, as well as the absence of errors caused by the magnetic circuit of legacy transformers. Although the FOCS scheme is well known and has been actively developed for over a quarter century, it has certain disadvantages that limit its use. This paper describes the authors’ efforts to solve these problems in order to make FOCS technology competitive and widely adopted. We upgraded the FOCS optical circuit, expanded the frequency band of the captured current signal, and reduced the solution’s cost. We designed new signal processing algorithms to compensate for errors caused by internal factors in the measurement circuit, as well as those caused by environmental influences. We developed an FOCS computer model based on the Jones matrix formalism to enhance the experimental debugging. It allowed us to define the requirements for elements of the optical circuit and its production accuracy.

Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

“…The temperature and electric current sensing system share the same data processing system. The optical power of the signal received by the photodetector is the sum of the harmonics of the modulation frequency of EOM if the light source is a continuous light source, as described in previous works [28]. The square wave signals can be expanded into the Fourier series, which is the sum of the harmonics of the modulation frequency of AOM.…”

Fiber Optic Sensors Based on the Faraday Effect

“…A high-frequency carrier signal can be generated in several ways [ 100 , 110 , 111 , 112 , 113 , 114 , 115 ]. Temkina et al [ 116 , 117 ] recognized the problem of economic competitiveness and proposed a solution for the temperature dependence of quarter wave plates based on signal processing. Additionally, the piezoelectric phase modulator was replaced by an electro-optical modulator, shifting the carrier frequency to gigahertz range and decreasing the required length of expensive polarization-maintaining OF.…”

Advances in Tapered Optical Fiber Sensor Structures: From Conventional to Novel and Emerging

“…Subsequently, fiber-optic sensing came into being. Compared with traditional electrical sensors, fiber-optic sensing uses optical signals as the modulation and transmission carrier, which allows it to have many unique advantages [ 1 , 2 , 3 , 4 ], such as strong resistance to electromagnetic interference in the transmission process, thus allowing it to play a very significant role in the power system [ 5 , 6 ], and strong corrosion resistance, which can be measured for highly corrosive analytes [ 7 ], as it has a compact structure that can be fabricated according to the needs of the size of very small fiber optic sensors [ 8 ]. Simultaneously, several studies have highlighted the advantages of simple fiber optic materials, cost-effectiveness, and broad scale utilization [ 9 , 10 ].…”