Acceleration Sensor Using Optical Fibers and Film Gratings

Intensity modulation‐based fibre optic vibration sensor using an aperture within a proof mass

“…Various intensity modulation‐based fibre optic vibration sensors (FOVSs) were previously discussed and compared; extrinsic reflective intensity modulation types, cantilever beam types, and the other types [16–24]. The extrinsic reflective intensity modulation types usually employed the bundle optical fibre to illuminate the target and collect the back‐reflected light, which express the amplitude of target vibration.…”

“…In addition, the other structures, such as grating‐based FOS, film grating types, and shutter types based on micro‐electromechanical systems (MEMS) and so on, were introduced. These types have advantages of simple mechanical structure, good reliability, but they are usually used in detecting the vibration with low frequency [20–23]. Our previous work presented a FOVS with an aperture within a mass‐spring structure, which showed some basic experimental results and had a bulk and heavy structure [24].…”

Parametric Study of the Reflective Periodic Grating for In-Plane Displacement Measurement Using Optical Fibers

“…However, most reflective FOSs have been limited to applications in very small measurement ranges of a few millimeters to microns [ 11 ]. Accordingly, in order to develop economical and widely applicable optical fiber sensors for extended measurement ranges, studies have been conducted on hydrophone [ 12 ] and accelerometers [ 13 – 15 ] that use the transmitted light of FOSs through two grating panels [ 12 – 15 ] or a grating film [ 16 ] to directly measure the dynamic displacement of a seismic mass. Essentially, these techniques function using the sinusoidal signal of transmitted light that is patterned based on the shutter or moiré fringe effect of two grating panels, and they have satisfied the basic requirement of low cost in developing a sensor system.…”

“…The proposed sensor is designed as follows: the emitted light from one optical fiber arrives on the grating panel and then the partially reflected light from the grating enters the optical fiber that is used as a light emitter. As a result, the main distinctions between the proposed design and other accelerometers [ 12 – 16 ] that are also based on the grating panel are the use of a single reflective grating panel (RGP) to vary the intensity of the reflected light and the use of only two transceiver optical fibers on one side of the sensor case. However, in order to operate as a conventional grating based sensor, it is critical that a stable and periodic sine wave signal be obtained from the reflected light that is induced by the movement of the grating panel.…”

Measurement Method and System of Optical Fiber-Based Beam Width Using a Reflective Grating Panel

“…In these sensors, the optical beam width emitted from the end of the optical fiber is a critical parameter for determining the condition of the sinusoidal signal (Feng and Kim, 2006;Kim, 2009;Lee et al, 2008Lee et al, , 2009). Therefore, a simple system is required to measure the emitted beam width at the end of an optical fiber.…”