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    SPIE Digital Library
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    Fiber Bragg grating pressure sensors: a review - SPIE Digital Library

    Can a dual fiber Bragg grating measure ambient temperature?
    Abstract: A high-sensitivity and small-size pressure sensor based on dual fiber Bragg grating (FBG), a diaphragm and hinge-lever structure is proposed. Its measurement principle is described and simulation analysis is conducted. We compensate for temperature cross-sensitivity by using an additional FBG to accurately measure the ambient temperature.
    ieeexplore.ieee.org
    A highly sensitive diaphragm pressure sensor based …

    The demand for accurate low-pressure sensing has become indispensable across diverse industries and research domains, where meticulous pressure monitoring holds paramount significance. This research work presents the development of a multiprobe extrinsically sensitive low pressure fiber Bragg grating (FBG) sensor. Three distinct diaphragm-based FBG sensing probes, equipped with silicone diaphragms of 0.5 mm, 1 mm, and 2 mm thick…

    The demand for accurate low-pressure sensing has become indispensable across diverse industries and research domains, where meticulous pressure monitoring holds paramount significance. This research work presents the development of a multiprobe extrinsically sensitive low pressure fiber Bragg grating (FBG) sensor. Three distinct diaphragm-based FBG sensing probes, equipped with silicone diaphragms of 0.5 mm, 1 mm, and 2 mm thickness, are developed within a unified assembly. This design offers the flexibility to select a probe based on the pressure magnitude and desired sensitivity and resolution. The displacement of diaphragm centers within the probes, caused by pressure variations in gas pipe channels, is actuated through an FBG-cantilever system. The sensor exhibits a dynamic range spanning 0 to 10 psi, featuring a peak sensitivity of 1.635 nm/psi. With a negligible hysteresis of 0.2 % observed in a complete operational cycle, the sensor demonstrates consistent stability across various constant pressure conditions, characterized by an average transient of <1 %. Furthermore, cyclic testing reveals an average deviation of 1.58 % in sensor response. This innovative sensor offers promising avenues for industrial applications and research and development endeavors that necessitate precise and reliable pressure measurements in the low pressure domains.

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    ScienceDirect

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    Demand for accurate low-pressure sensing is vital in diverse industries and research.

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    Introducing a multiprobe extrinsically sensitive low-pressure FBG sensor.

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    Three FBG sensing probes are designed holding 0.5–2 mm thick silicone diaphragms.

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    Diaphragm displacement is measured by cantilever-FBG system.

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    Sensor spans 0 to 10 psi, with a peak sensitivity of 1.635 nm/psi.

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    Fiber Bragg grating

    Diaphragm pressure sensor

    Low pressure sensing

    Multiprobe configuration

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    In recent years, there has been a substantial increase in the demand for highly sensitive pressure sensors due to their pivotal role in diverse applications, including industrial monitoring, biomedical devices and environmental sensing [1], [2]. Common sensor types include piezoelectric pressure sensor, capacitive pressure sensor, microelectromechanical systems (MEMS) pressure transducer, free space interferometer based pressure sensor and Bourdon tube pressure gauge [3], [4], [5], [6]. However, fiber optic-based pressure sensors offer distinct advantages over traditional counterparts, such as inherent immunity to electromagnetic interference, lightweight and small size, higher sensitivity and resolution, long-distance transmission, chemical and corrosion resistance and inherent safety in hazardous and flammable environments [7], [8]. Various optical fiber-based pressure sensors reported in the literature are based on fiber Bragg grating (FBG) [9], [10], [11], [12], Fabry-Perot interferometer [13], [14], [15], Mach-Zehnder interferometer [16], [17], [18] and microbend fiber optics [19], [20]. Among these, FBG sensors have gained substantial recognition as a promising option, attributed to their high sensitivity and multiplexing capabilities for distributed sensing [21]. FBGs function as fiber optic reflectors, exhibiting wavelength shifts in response to mechanical strain and temperature variations, enabling the direct measurement of pressure-induced deformations.

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    2.1. Design of the sensing probes

    A tri-sensing probes type FBG pressure sensor is designed and developed with intention to cover the lower pressure sensing range, typically less than 10 psi, with enhanced sensitivity and resolution. The sensor architecture involves the fabrication of three distinct pressure sensing probes, each featuring a silicone diaphragm with specific thicknesses: 0.5 mm, 1 mm, and 2 mm. These diaphragms are positioned between two specially engineered C-type aluminum flanges, firmly held together using O-rings. In each sensing probe, the bottom flange is designed with a total diameter of 50 mm, a wall thickness of 10 mm and a central step measuring 4 mm in depth and 20 mm in diameter. Additionally, the flange is terminated with a threaded head, 12 mm in width, allowing for easy connection to the gas flow pipe. The threaded head incorporates a 2 mm hole, providing a pathway for gas to enter the probe and displace the diaphragm from its center. On the other hand the top CF flange is blank from the upper side with a wall thickness of 15 mm, diameter of 50 mm and includes a central step, 10 mm deep and 20 mm in diameter to enable free movement of the diaphragm's center. In each probe, pressure variation in the pipe channel results in the displacement of the center of the diaphragm. Due to displacement of the diaphragm, a deflection occurred in a stainless (SS) canti…

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