The force transducer is introduced

1 strain sensors principle:

consists of one or more to produce deformation of the elastomer after stress, and can detect the shape of the variable resistance strain gauge bridge circuit consisting of ( Such as the wheatstone bridge) Can, and the resistance strain gauge fixed paste the adhesive of elastomer and conduction on the dependent variable and the protection of electronic circuit of the sealant of three most force transducer, etc.

2 force transducer working process:

after by external force, resulting in the elastomer strain gages deformation resistance, resistance change overbalance the wheatstone bridge consisting of output with a linearly proportional changes of the external force electricity electrical signal

3 force transducer materials:

3 - 1 elastomer material:

force transducer elastomer material, generally choose metal material, can choose the material of most of aluminum alloy material, alloy steel materials and stainless steel material. Alloy material has both stiffness to ensure consistent deformation and deformation recovery, good weather resistance and anti-corrosion performance. Elastomer main requirement is to accurately transfer force information and keep in force at the time of the same deformation consistency and completely reset

3 - 2 strain gauge and resistance element materials:

the composition of resistance strain gauge complex, is a complex products, the combination of the copper base material and the strain of the strain gauge is protean, according to the requirements of the strain, at present, there are about one thousand kinds of products. General, base material with polymer thin film materials, strain material for high purity constantan. Different substrate constantan through optical processing after etching induced deformation resistance wire grid. As a result, the quality of the resistance strain gauge is not only related to substrate material and composite metal purity, and composite process, etching, etching chemical materials and post-processing technique of process and material and so on factors related.

　　3- 3 strips of adhesive material:

the resistance strain gauge patch with adhesive mainly adopts bicomponent polymer epoxy adhesive series, the performance of high polymer chemical products and the components that is closely related to the physical and chemical indexes, such as purity, molecular chain structure and size, storage time, ratio of components, molecular modification, mixing method, hybrid curing time, curing time, curing temperature, additives and percentage.

　　3- 4 sealant material:

in welding technology and equipment in the initial stage of inadequate force transducer, adopt special silicone sealant series. Silicone rubber with long-term chemical stability, therefore, anti-corrosion, moisture-proof, ageing resistance, insulation performance is excellent, all sealant has long been the preferred products.

　　3- Five force transducer wire material:

wire is still is an integral part of the force transducer and load cell wires of metal, because the wire use of household appliances, quality differences have experience. After all wires are bridge circuit of power supply and signal output voltage, long-term incentive compensation pathway, silver plated than copper wire transmission effect is good, copper wire than aluminium wire transmission effect is good, its effect is self-evident.

as, all kinds of high frequency interference, such as radio waves, more and more, good shielding of force transducer is also important way to protect the signal stability. Pest erosion, in addition, the environment infringement, fire retardant and so on also need sensor material corrosion protective layer the insects for fire and explosion prevention, even need to use armor protection, such as casing protection method.

　　3- 6 wire sealing materials and methods:

each component of the force transducer will affect the technical characteristics of the sensor in the end, some only a simple way to avoid the movement of the wire and damage electronic circuit of sensor is fixed, some very short transmission distance even just rely on glue sealing fixed force transducer. But a larger volume, weight, larger force transducer, if there is no proper wire way of fixed or seal, the bottleneck of force transducer is most prone to failure. Especially with sealing head fixed conductor, the material of fasteners and fastening strength will also affect the final technical performance force transducer. Observers found that there are few use fastener installation use sealing glue, so that you can avoid relying on fixed clamp force of residual stress, also won't because of a shortage of fastening force and leakage problems.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor