Abstract
In this paper, an implementation method of high sensitivity thin film fiber optic pressure sensor based on air blowing method is proposed. The utility model is characterized in that a film ultra-thin microbubble structure is firstly formed on the surface of the AB epoxy glue solution by using high-pressure air, and then the film portion of the end portion of the microbubble is transferred to a single-mode fiber head with a hollow glass tube at the top. Finally, a thin film structure fiber Fabry-Perot fiber pressure sensor is formed. The experimental results show that the thickness of the thin film layer at the end of the FP sensor is only 16 μm. Correspondingly, the maximum pressure sensitivity can reach 263.15 pm/kPa. Meanwhile, due to the decrease of film thickness, the sensor's resistance to temperature interference is improved. The prepared fiber Fabry-Perot pressure sensor has the advantages of ultra-thin film thickness, high-pressure sensitivity, low cost and good repeatability. Therefore, it has good application value in high sensitivity pressure and sound wave detection.
Highlights
Optical fiber F-P cavity pressure sensor is widely used in physical and biochemical parameters measurement due to its advantages such as high sensitivity, small size, anti-electromagnetic field interference, etc [1]
By using a pressure pump to pressurize and blow bubbles, a very thin film microbubble structure is formed on the surface of liquid AB epoxy glue, and the film microbubbles are clicked on the end face of the glass tube to form a fiber optic F-P pressure sensor with a thin film structure
The novel fiber optic pressure sensor filled with AB epoxy film based on bubble blowing method is proposed
Summary
Optical fiber F-P cavity pressure sensor is widely used in physical and biochemical parameters measurement due to its advantages such as high sensitivity, small size, anti-electromagnetic field interference, etc [1]. The sensitivity of the sidewall type F-P pressure sensor is mainly determined by the wall thickness of the F-P cavity. Our research showed that an ultra-thin microbubble was generated on the surface of AB epoxy adhesive by high-pressure gas, and a fiber Fabry-Perot sensor could be fabricated based on the microbubble by the transfer method. An AB epoxy film-type fiber optic pressure sensor based on bubble blowing method is proposed. By using a pressure pump to pressurize and blow bubbles, a very thin film microbubble structure is formed on the surface of liquid AB epoxy glue, and the film microbubbles are clicked on the end face of the glass tube to form a fiber optic F-P pressure sensor with a thin film structure. Since the AB film layer is very thin, this sensor can achieve high-pressure sensitivity with a maximum pressure sensitivity of about 263.15 pm/kPa
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