Bragg interrogator

Strainmeter to detect earth tide and seismic waves from earthquakes

Strainmeter based on laser wavelength monitoring

We have seen in a previous article that a set-up based on a laser and Optical Fiber Bragg grating (FBG) sensors can be used for strain and temperature monitoring. This technique is based on the monitoring of reflected laser wavelength. FBG sensors find one application in seismology. Strain monitoring is well known in the field of seismology for earth science observation purposes. Strainmeters measure deformation over periods of days, months, and years. This allows them to measure signals at lower…

Monitoring a laser wavelength for strain and temperature

How a laser enables you to monitor temperature and strain variations?

Lasers are also used in set-ups aimed for monitoring strain and temperature. In those set-ups strain and temperature variations are directly proportional to the shift of a reflected laser wavelength. Optical Fiber Bragg Gratings (FBG) are known for many years and allow using an optical fiber as a Temperature + Strain + Pressure sensor. An optical fiber Bragg grating acts as a mirror at a specific wavelength depending on the distance between its lines, and transmits all others, or acts…