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2023-12-07
Shanghai Dingzun Cable has always been dedicating to developing new products to better meet different needs of customers all over the world. Through the efforts of our company’s engineers,we have managed to develop latest fiber optic cables to replace traditional thermocouple cables for temperature measuring.
1.Traditional thermocouple cables:
The working principle of thermocouple cables are that two conductors of different compositions are connected to form a loop. When the joining temperatures are different, a phenomenon called thermoelectric effect will occur in the loop. Based on the different temperatures, Thermocouple cables use this principle to measure them.
By Contrast,there are several common shortcomings when using thermocouple cables,including slow temperature response,errors aroused from nonlinear temperature characteristics ,and unreliable cable joints.
2. Newly developed Fiber optic cables:
Newly developed Fiber optic cable by Shanghai Dingzun contains optical fibers precisely measuring temperatures while each fiber optic assembly is typically coated with protective stainless steel tubes,and silicone material is used as jacket.
Fiber optic temperature measurement technology we used is to measure the characteristics of the transmitted signals inside the optical fibers for temperature information.
The principle mainly includes two aspects: thermal optical effect and optical properties of optical fibers.
2.1. Thermal optical effect
When the fiber optic is subjected to temperature changes, the fiber medium will expand, thereby changing the diffracted index of the fiber optic. Due to the presence of multiple total reflection layers inside the optical fiber, light signals will reflect from these layers during transmission. When the fiber optic is subjected to temperature changes, the intensity of reflected light will change, thereby affecting the transmission of optical signals.
2.2 Optical properties
Diffracted index of optical fibers is related to temperature, which can be determined by comparing the transmission signals of external lasers and optical fibers. When the refractive index of the fiber changes, the signal emitted by the laser will have significant changes,so we can get the temperature change By analyzing the transmission signal.
3 Product advantages
1. Not affected by electromagnetic interference, capable of temperature measurement under strong electromagnetic fields.
2. real-time monitoring with good explosion-proof performance.
3. Small in size, light in weight, and capable of bending.
4. High sensitivity and long service life.
5. Long transmission distance and convenient maintenance.
The application scenarios include: strong electromagnetic fields, high-pressure environments, explosive environments, ultra-high temperature environments, buildings, bridges, and so on.
The advantage of this fiber optic cable is that it can accurately monitor temperature changes, adjust and control them in a timely manner. The silicone jacket has the characteristics of elasticity, heat resistance, and softness, and is protected by stainless steel tubes for optical fiber protection, and does not contain halogens.
Shanghai Dingzun Special Wire and Cable Co., Ltd. has 18 years of production，research and development experience with independent invention patents and can design,produce cables in 6 categories，over 800 specifications. The main products include high-temperature resistant cables, high-voltage resistant cables, coaxial cables, fiber optic cables and other special cables. The product is widely used in industries such as aerospace, electronics, instrumentation, metallurgy, and chemical engineering.
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