The aluminum foil sensor is composed of elastomer, strain gauge, adhesive, maintenance layer, compensation circuit, etc. The strain transmission path is: elastomer - + adhesive → strain gauge sensitive grid - + overlay - maintenance coating, which constitutes a complex system that is more different from the strain gauge itself. For example, if a strain gauge is attached to an elastomer, it is tentatively called a strain gauge device.
Principle:
Taking a strain sensor as an example, the principle of a force sensor is analyzed.
The strain gauge load cell is an advanced quaenic gauge variable that is pasted on a tensile elastomer using the principle of resistance strain to form the entire bridge circuit. When loaded, the elastomer deforms and the strain gauge senses the strain accordingly, causing the bridge to lose equilibrium, and the output is proportional to the stress. In order to reduce the influence of temperature on the function of the sensor, the temperature zero drift compensation resistor T, the temperature sensitivity compensation resistor E, and the balance resistor D are added. The application and maintenance of strain gauge load cells should be the operation and maintenance of attention sensors. Take, for example, tension and pressure sensors.
1. Static calibration: The tensile and compression sensor has high accuracy, and the standard force source needs to be calibrated regularly, generally once every 6 months.
2. When calibrating the sensor, it must be powered on and preheated for 15 minutes, and then pre-installed 3 times. The stability of the bridge DC regulated power supply shall not be less than 0.01%.
3. The force sensor is measured and recorded with digital voltmeter, potentiometer, dynamometer, various strain gauges and recorders. When measuring long distances, the above links should be grounded, and the connecting cables should be fixed as short as possible and away from noise sources.
4. The sensor is connected to the bridge power supply and the secondary meter through the plug socket. It is advisable to select the size of the force transducer based on 80% of the rated load. The lower limit of the operating scale should be greater than 20% of the rated load as much as possible. If multiple sensors (e.g. large-tonnage scales) are used in parallel, G=P/N can be selected depending on the type.
5.P-The rated total load of the electronic scale. N- Number of parallel sensors. If you choose a single sensor size based on the above types, you can choose a standard that is close to that scale, rather than within the series standard scale. The tension pressure sensor can only be overloaded to 50%, but it should not be exceeded.
6. When the tension and compression sensor is not used, it should be stored at 10-35°C, the relative humidity is not more than 85%, and there is no acid, alkali or corrosive gas.
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