Optical fiber ultrasonic sensor used for improving directivity and packaging method
A technology of ultrasonic sensor and packaging method, which is applied in the direction of measuring ultrasonic/sonic/infrasonic waves, instruments, measuring devices, etc. It can solve problems such as difficulty in controlling the directivity of sensors, inability to obtain directivity results, and sound pressure measurement errors, etc., to improve Measurement accuracy, good sound field effect, and improved directivity effect
Active Publication Date: 2017-12-01
TONGJI UNIV
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Problems solved by technology
In addition, through simple packaging, it is difficult to control the directivity of the sensor, and there is no way to obtain regular directivity results, especially the angle at which the maximum value appears is likely to be inconsistent, which affects the placement of the angle of the optical fiber hydrophone sound field measurement Larger, the measurement of sound pressure will also have a larger error
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[0027] Such as figure 1 As shown, a fiber optic ultrasonic sensor for improving directivity includes a fiber optic body 1, and the fiber optic ultrasonic sensor also includes a shielding needle tube, the shielding needle tube is sleeved outside the fiber optic body 1 and part of the sensing area of the fiber optic body 1 extends out of the front end of the shielding needle tube , the fiber body 1 exposed at the front end of the shielding needle tube is wrapped by a hemispherical glass 3, and the hemispherical glass 3 is sealed and connected to the front end of the shielding needle tube. The shielding needle tube is a steel shielding needle tube 2 . A damping filler is filled between the fiber body 1 in the shielding needle tube and the wall of the shielding needle tube. The damping filler consists of silicone rubber4. The optical fiber body 1 is packaged with a steel shielding needle tube 2 to shield the influence of the surrounding sound field, and the exposed part of the...
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The invention relates to an optical fiber ultrasonic sensor used for improving the directivity and a packaging method. The optical fiber ultrasonic sensor comprises an optical fiber body (1), the optical fiber ultrasonic sensor also comprises a shielding needle, the optical fiber body (1) is sleeved by the shielding needle, a part of a sensing region of the optical fiber body (1) extends out of the front end of the shielding needle, the optical fiber body (1), exposed out of the front end of the shielding needle, is wrapped by semispherical glass (3), and the semispherical glass (3) is connected with the front end of the shielding needle in a sealing manner. Compared with the prior art, according to the packaged optical fiber ultrasonic sensor, measurement of single-point sound signals in the space can be realized, and the effect of improving the directivity is achieved.
Description
technical field [0001] The invention relates to an optical fiber ultrasonic sensor and a packaging method, in particular to an optical fiber ultrasonic sensor and a packaging method for improving directivity. Background technique [0002] The traditional acoustic-electric transducer has technical specifications, mature technology, and is easy to use. However, it is difficult to work normally in some harsh environments, such as detecting chemical or electromagnetic environments or high-intensity sound fields. The optical fiber acoustic sensor, due to the insulation of the material, can resist electromagnetic interference, and the material has the characteristics of strong pressure resistance, high sensitivity, corrosion resistance, etc., has attracted more and more attention. In addition, with the advancement of manufacturing technology, its cost is also decreasing, easy to reuse, and has a high cost performance. It is an ideal substitute for traditional acoustic-electric tra...
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Login to View More IPC IPC(8): G01H9/00
CPCG01H9/002G01H9/004G01H9/008
Inventor 程茜钱梦騄徐峥陈皓潘晶陈盈娜覃宇严旭赵文丞
Owner TONGJI UNIV