Home Communication Fiber-optic Fabry-Perot sensors an introduction
Besides the above applications, FFP sensors have also been used in other areas. A diaphragm-based EFFPI acoustic sensor was developed to measure attenuation properties of acoustic waves in water and a ~30° detection range was observed with an acoustic wave attenuation coefficient of 0.0626/cm . An FP polymer film interferometer was constructed for ultrasound sensing that provides excellent detection sensitivities (<10 kPa) . The development of an EFFPI ultrasound sensor offers the potential to use it in fiber-optic “smart structures” applications . An inline FFPI fabricated from hollow- core PCF exhibits a wavelength pressure sensitivity twice as high as that of FBG, which is ~7.29 X 10-3 nm/MPa . MEMS-based EFFPI sensors were first demonstrated by Mendez et al. for electric field sensing [32,33]. A compact EFFPI sensor that uses a wire-based magnetostrictive transducer  was investigated for DC magnetic field (100-35,000 nT) sensing . Magnetic fluid is adopted to form an EFPI magnetic field sensor, which has a measurement sensitivity of 0.0431 nm/Gs  and 33 pm/Oe . A nano-magnetic fluid- based EFFPI has also shown good results in the measurement of magnetic fields . Others such as liquid-level sensors [36-38], flow velocity sensors , and humidity sensors [40,41], have also been used in their corresponding fields.
After many years of development, various FFPI sensors have been developed into commercial products. Typical FFPI sensors from different companies are listed in Table 6.1. Among them, the most successful FFPI sensor is one for pressure measurement in biomedicine, which is the best compromise offering, at affordable price, a great flexibility in terms of pressure ranges, high sensitivity, and miniature size suitable for most biomedicine applications, such as neuroscience, cardiovascular, intraocular pressure, urology, spine, bone, etc. Also, laser- micromachined FFPI sensors for measurement of physical parameters in harsh environments would have a very bright future .
Table 6.1 Typical FFPI Sensors from Different Companies
Table 6.1 (Continued)
a https://opsens.com/ b www.fiso.com c http://www.oxsensis.com/ d http://www.primephotonics.com/
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