Table 2.
Advantages of FPI explored in the literature are presented over given time range.
| Time Slots | Ref. No. | Advantages Reported in Literature | Disadvantages Reported in Literature |
|---|---|---|---|
| 1981–1990 | [53] (1982) | FPI can have high finesse; Very long distance FPI can be achieved, thus so a high spectral resolution; Walk-off loss problem has been addressed by the fabricated FPI, that involves less accuracy for the tilt angle of reflection surface than the usual form of FPI; such sensor is compatible for a scanning FPI because the optical path length in fiber can be readily modulated by appropriate external perturbations for example, temperature and mechanical forces. | The walk-off loss of light power is a severe difficulty of FPI fabrication technique that causes by the presence of tilt of the reflection surfaces. It merely decreases the effectiveness and eflectance of the conventional FPI. An increase in interferometer length is the proportion of walk-off loss increase, so construction of long-distance FPI is hardly possible. |
| [4] (1988) | Crosstalk drawback is conquered. Requires no separate fiber reference arm. | Crosstalk is another serious drawback of FPI fiber-optic sensor with coherence multiplexing. A coherent signal is generated in the image plane due to highly scattering objects and shows similarity with that of sample depth within the length of coherence refers to “crosstalk”. This problem affects the lengths for several sensors and limits the number of sensors used. | |
| 1991–2000 | [81] (1992) | FPI sensors have High spatial resolution (∼20 μm2), High temperature resolution (sub mK), Intrinsic calibration, High measurement bandwidth (>100 kHz), Multiplexed arrays possible, Immunity to electro-magnetic interference. | |
| [56] (1994) | LED is used due to gain advantages form the proposed fabrication technique. | The limitations of utilizing LED is that, it has much larger spectral bandwidth and its length of coherence is much shorter than that of laser. | |
| [70] (1996) | The c technique. | Almost all the signal processing techniques suffer from phase measurement inaccuracy problem due to the multiple reflections at the two reflective surfaces of FPI. | |
| 1991–2000 | [59] (1996) | Using a slim polymer film as one of the reflective surfaces of FPI has many advantages such as, it itself is an interferometer, shorter path length, low sensitivity to pressure and thermal differences. As a result, phase-bias-control and complicated polarization systems are not essential. Using a cavity that filled with water other than air has merits too such as, (i) giving a best possible fringe visibility of unity the coefficients of Fresnel reflection on both sides of the film will be the same, and (ii) a possibility of degrading the sensor's consistency of frequency response. | Phase-bias-control and polarization systems are essential for FPI fabrication techniques which makes the entire system more complicated. |
| 2001–2010 | [155] (2009) | Reasonably easy fabrication, high resolution, possibly inexpensive, and low sluggishness on temperature differences. | |
| [72] (2009) | A miniature monolithic FPI with a cavity of microbubbleexhibites low-temperature sensitivity (less than 1 pm/°C) which indicates that measuring an extreme low temperature can be possible by a microcavity based FPI sensor. | ||
| 2011–2014 | [40] (2011) | Easy fabrication even a small size of sensor heads as well as low thermal indolence, and support dielectric construction. | |
| [28] (2012) | FPI can be constructed as ultra-compact in size, cost effective, and easy to fabricate. | ||
| [66] (2012) | It can be exceptionally tiny size, high sensitivity, all fiber connection, and particularly exclusive structure presents huge potentials for fast-response high temperature sensing mostly in miniature and harsh area with high temperature gradient. Fragility problem has not been addressed. | The fragility of tapper fiber tip is a serious shortcoming in the implementation of such sensors to sensing applications. The sensor can be broken easily due to simple handling or to vibrations that are frequently met in actual industrial applications. | |
| [75] (2012) | Using chitosan as reflective surfaces of FPI proposes excellent diaphragm forming capability, high-quality mechanical stiffness as well as enhanced steadiness with respect to the differences in comparative humidity. | ||
| [77] (2012) | A c is consistent in the measurement of exceptionally low temperature cross sensitivity. |