Spot welded fiber grating strain sensor and its installation method

Abstract

The invention discloses a spot welding fiber bragg grating strain sensor. The spot welding fiber bragg grating strain sensor comprises a fiber bragg grating strain sensor body and a base body made of high-elasticity alloy materials, wherein the base body comprises a substrate, a left regulating block and a right regulating block, the left regulating block and the right regulating block are connected with the left end and the right end of the base body respectively in an integrated mode, a base body groove is formed in the middle of the position, between the two regulating blocks, of the base body, the outer side of the fiber bragg grating strain sensor body is provided with a packaging layer made of low-melting-point glass powder, and the lower half portion of the packaging layer is connected with the base body groove; the right regulating block is transversely provided with a regulating hole, a regulating bolt penetrates through the regulating hole, and the left end of the regulating bolt abuts against the right side face of the left regulating block; the periphery of the substrate is provided with a rubber layer used for sealing. As the spot welding fiber bragg grating strain sensor is obviously superior to a traditional resistance strain gage, the purpose that the real-time state of strain of an iron tower electric transmission line is known comprehensively for a long time is achieved.

Description

technical field [0001] The invention relates to the field of sensors. Background technique [0002] With the continuous progress of human society, daily life relies more and more on electricity, and the smooth transmission of electricity is the guarantee of people's normal life. The damage of transmission lines due to natural and man-made causes has a huge impact on people's daily life. [0003] Due to the change of meteorological conditions, the external load of the transmission line in the external environment also changes. One of the external loads that plays a major role in damage is strong wind. The balance state of the transmission line tower installed in the field under the galloping condition is a dynamic process. These will directly affect the foundation, tower, and span of the high-voltage transmission line tower, and further cause deformation of other elements of the high-voltage transmission line, or even collapse the tower. Since this is a slow process, by mo...

AI Technical Summary

Problems solved by technology

The problem is that the resistance strain gauge is susceptible to electromagnetic interference and has a short life, so it is difficult to apply for long-term monitoring

The problem is that if the resistance strain gauge gets wet, the insulation resistance and bonding strength will be reduced, and in severe cases, the sensitive grid will be corroded; the intrusion of acid, alkali and oil will even change the physical properties of the substrate and adhesive

[0013] There are generally two problems in the existing spot-welded fiber grating strain sensors: one is that due to the large thickness gap of the fiber grating substrate, welding is difficult and the welding distance is very short; the other is that there is a large creep when using ordinary epoxy resin glue changes, reducing the stability of long-term measurements

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