Fiber Temperature Sensor The temperature measurement is used in harsh environments that exist in electromagnetic, chemical and mechanical interference.

Why use Fiber Temperature Sensor ?
Sensors such as hot electric puppets and resistance temperature detectors (RTD) do not always produce satisfactory performance. For example, the existence of electromagnetic, chemistry and chemistry and chemistry and chemistry, chemistry and When measuring fluid temperature in a harsh environment for mechanical interference.

Under the circumstances that the extreme marine environment and underground geological sites need to be measured accurately and long -distance measurement. For such applications, optical fiber sensors provide better choices, because optical signals will not be disturbed by electromagnetic fields, and can be transmitted within a long distance without any major losses.

Use the fiber displacement sensor to measure:

This sensor is essentially a FODS with a 3 DB multimodal fiber coupling as a probe. 594 NM HE-Ne Light beams are transmitted to the port 1 of the coupler. Light spreads to Port 3 and dispersed when leaving the end of the fiber. Then reflect on the upper surface with a diameter of 0.5 cm and 7 cm in length.

port 3 probe is fixed on the position of about 1 mm vertically on the surface of the aluminum rod, so that reflex light can easily re -introduce the same end. The collected light is sent to Port 2 via 3DB coupler and measured with a silicone optoelectronics detector. The detector converts the light to a electrical signal, and then process it from the blocking amplifier. Finally, it can be visualized and stored in the computer.

Optical fiber temperature sensor based on life measurement:

A fluorescent sensors are widely used to measure various parameters because they are relatively independent of environmental conditions.

980nm laser pump beams are transmitted into a 90 cm long optical fiber (EDF) through the waves (WDM) coupler. EDF is placed in a vacuum oven, which allows us to change the fiber temperature within the interval between 25 and 200OC.

The fluorescence signal from the front pump EDF is detected by the GE optoelectronics detector and is treated with a digital oscilloscope. The 980 NM pump beam was cut waves to generate a square wave modulation signal with a pulse width of 2.2MS.

The temperature sensing mechanism in this work is based on the temperature dependence of the fluorescent life attenuation. The fluorescent life is measured by a modulation pump laser with a power of about 2 mW. The temperature measurement results are 85 ° C and 130 ° C