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American scientists have developed a new type of optical fiber sensor

American scientists have developed a new type of optical pressure sensor that can be used under extreme conditions. At the same time, this optical fiber sensor can not only measure the pressure up to 1800mpa (2620 psi), but also put the sensor head into liquid nitrogen at -196 ° C or heat it to 538 ° C, and the performance will not change significantly

the concept of this kind of sensor comes from chujiwang and susanscherrer of the detection instrument and Analysis Laboratory (DIAL) of the University of Mississippi. They applied the well-known "cavityring downspectroscopy (CRDs) technology to optical fiber sensors to produce an instrument called" fiberringdownsensor ". The key to its operation is that the attenuation time of the optical pulse strongly depends on the attenuation caused by the optical fiber ring. Therefore, any phenomenon that causes the change of optical fiber transmission, such as external compression (pressure), can be measured by monitoring the attenuation time. Wang said that this new sensor has many advantages over Bragg fibers (FBGs) and fiber Fabry Perot interferometers (FPPI), and that the quality stability and other aspects of this new design are important parts of the overall cost; Brand to brand of testing instrument is a reflection of the product market and product quality to a certain extent, so as to drive a new generation of physical sensors. Display constant temperature time

this sensor consists of two identical 2 × 1 optical fiber coupler (99:1 shunt ratio) and a standard single-mode optical fiber (corningsmf-28) are connected to form a 65m long loop. The researcher injected a 1650nm pulse into the loop through a coupler; The intensity of the pulse will decrease slightly every time it goes around the ring, and its attenuation time and intensity will be continuously monitored by another coupler. In the experiment, a section of 8mm long optical fiber sensor is weighed. Cellene TPE particles are widely used in medical devices, packaging and other standardized markets. The results show that the sensor can measure the pressure up to 1800 MPa. If the jacket is removed, its sensing range will be reduced, but its sensitivity will be increased

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