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A fiber grating pressure sensor with a diaphragm-type cascade structure and a manufacturing method thereof

A pressure sensor and fiber grating technology, which is applied in the direction of fluid pressure measurement, measurement of fluid pressure, instruments, etc. using optical methods, can solve the problems of large volume, high cost, unfavorable for single-point disposable measurement, etc., and achieve high precision. , the effect of eliminating the effect of temperature

Active Publication Date: 2022-07-08
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN205958169U discloses a serial fiber grating pressure sensor, multiple pressure sensors can be connected in series through output at both ends to form a quasi-distributed network measurement system. This method is large in size and high in cost, which is not conducive to single-point disposal measurement

Method used

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  • A fiber grating pressure sensor with a diaphragm-type cascade structure and a manufacturing method thereof
  • A fiber grating pressure sensor with a diaphragm-type cascade structure and a manufacturing method thereof
  • A fiber grating pressure sensor with a diaphragm-type cascade structure and a manufacturing method thereof

Examples

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Embodiment 1

[0038] like figure 1 As shown, a diaphragm-type two-stage cascade structure fiber grating pressure sensor includes two pressure sensors connected through a sleeve, and a water-permeable hole 18 is provided on the side wall of the sleeve.

[0039] The first-stage pressure sensor includes a first-stage pressure shell 1 and a first-stage pressure diaphragm 2 located at the bottom of the first-stage pressure shell 1. The first-stage pressure diaphragm 2 is welded with a fixed pier 3, and the upper end of the fixed pier 3 is provided with a micro-diaphragm. The micro-hole is filled with colloid, and one end of the optical fiber is inserted into the micro-hole of the fixing pier 3 to be fixed.

[0040] The second-stage pressure sensor includes a second-stage pressure casing 4 and a second-stage pressure diaphragm 5 located at the bottom of the second-stage pressure casing 4. The second-stage pressure diaphragm 5 is provided with a central hole 21, and the central hole 21 is sealed a...

Embodiment 2

[0053] like Image 6 As shown, a diaphragm-type three-stage cascade structure fiber grating pressure sensor includes three pressure sensors connected through a sleeve, and a water-permeable hole 18 is provided on the side wall of the sleeve.

[0054] The first-stage pressure sensor includes a first-stage pressure shell 1 and a first-stage pressure diaphragm 2 located at the bottom of the first-stage pressure shell 1. The first-stage pressure diaphragm 2 is welded with a fixed pier 3, and the upper end of the fixed pier 3 is provided with a micro-diaphragm. The micro-hole is filled with colloid, and one end of the optical fiber is inserted into the micro-hole of the fixing pier 3 to be fixed.

[0055] The second-stage pressure sensor includes a second-stage pressure casing 4 and a second-stage pressure diaphragm 5 located at the bottom of the second-stage pressure casing 4. The second-stage pressure diaphragm 5 is provided with a central hole 21, and the central hole 21 is seal...

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Abstract

The invention discloses a fiber grating pressure sensor with a diaphragm type cascade structure and a manufacturing method thereof. The pressure sensor comprises a plurality of pressure sensors connected in sequence through a sleeve, and a water-permeable hole is provided on the side wall of the sleeve; Both include a pressure casing and a pressure diaphragm at the bottom of the pressure casing. One end of the optical fiber is fixed on the pressure diaphragm at the bottom, and the other end passes through the pressure casings and pressure diaphragms at all levels, and is pierced by the pigtail protective sleeve; the optical fiber is located in the pressure diaphragm. The part inside the casing is provided with a pressure measuring fiber grating, the part located in the sleeve is provided with a temperature measuring fiber grating, the pressure measuring fiber grating is in a pre-stretched state, and the temperature measuring fiber grating is in a free state; the pressure sensor disclosed in the present invention is sealed The laser welding process is adopted for the connection and the manufacturing method is simple and reliable.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a fiber grating pressure sensor with a diaphragm type cascade structure and a manufacturing method thereof. Background technique [0002] In a dynamic marine environment, various parameters need to be detected and calculated in real time to ensure the normal use of scientific equipment and the safety of personnel. Temperature, pressure, and salinity are the three most basic parameters for detection in the ocean. They are the basis for the calculation of parameters such as sound speed and density. [0003] If the existing fiber grating pressure sensor wants to achieve a large range, the thickness of the diaphragm needs to be increased. However, the greater the thickness of the diaphragm, the less sensitive it is to external pressure changes, that is, the lower the measurement accuracy. Therefore, it is impossible to take into account the requirements of large range ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/70G01L11/02G01L19/04F16B11/00
CPCB23K26/21B23K26/702G01L11/025G01L19/04F16B11/006Y02E30/30
Inventor 赵强于璐瑶万晓正丁宝艳李磊曲轶
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI