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Other Applications

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 [6]. An FP polymer film interferometer was constructed for ultrasound sensing that provides excellent detection sensitivities (<10 kPa) [7]. The development of an EFFPI ultrasound sensor offers the potential to use it in fiber-optic “smart structures” applications [9]. 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 [31]. 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 [18] was investigated for DC magnetic field (100-35,000 nT) sensing [29]. Magnetic fluid is adopted to form an EFPI magnetic field sensor, which has a measurement sensitivity of 0.0431 nm/Gs [34] and 33 pm/Oe [35]. A nano-magnetic fluid- based EFFPI has also shown good results in the measurement of magnetic fields [24]. Others such as liquid-level sensors [36-38], flow velocity sensors [39], 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 [42].

Table 6.1 Typical FFPI Sensors from Different Companies

COMPANY

PRODUCT

TYPES OF SENSORS

SPECIFICATIONS

SAMPLES

APPLICATIONS

Opsens3

OPP-M

Pressure sensor

Pressure range: -50 mmHg to +300 mmHg Resolution: 0.2 mmHg

Medical

OSP-A

Strain sensor

Strain range: +5000 jue Resolution: 0.5 jue

Civil engineering and geotechnical applications

FISOb

FOP-MIV

Pressure sensor

Pressure range: -300 mmHg to 7500 mmHg Resolution: 2.6 mmHg

Medical

Nortech

TPT-62

Temperature sensor

Temperature Range: -40°C to 225°C Resolution: 0.1°C

Energy

Oxsensisc

PT1000™

Dynamic pressure sensor

Pressure range: 1-25 bar

Dynamic output resolution: 2 x 10~5 of full scale

Operating temperature range:

  • -40°C to 750°C (continuous use)
  • -40°C to 1000°C (R&D use)

Gas turbine acoustic instability monitoring applications

TT1000™

Temperature sensor

Temperature measurement:

Phase 1: From -55°C to 1090°C (-65°F to 2000°F) Phase 2: From -55°C to 1500°C (-65°F to 2750°F) Measurement update rate 1-10 Hz Resolution of 0.3°C (0.54°F)

Aircraft braking systems, gas turbine systems and furnaces.

(Continued)

Table 6.1 (Continued)

COMPANY

PRODUCT

TYPES OF SENSORS

SPECIFICATIONS

Prime photonics'1

MFPS™ SP

Pressure sensor

Pressure ranges: 5-30,000 psi Temperature range: 0-750°F Frequency response: >100 kHz

MFPS™ ST

Temperature sensor

Temperature range: 0—1500°F Frequency response: 250 Hz

a https://opsens.com/ b www.fiso.com c http://www.oxsensis.com/ d http://www.primephotonics.com/

SAMPLES

APPLICATIONS

Medical, oil/gas, equipment monitoring

 
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