There are several reasons for the formation of zero drift of high-frequency pressure sensors:
1. There are bubbles or impurities in the adhesive layer of the strain gauge
2. The function of the strain gauge itself is unstable
3. There are virtual solder joints in the circuit
4. The stress release of elastomers is incomplete; In addition, it is related to magnetic field, frequency, temperature, etc. Drift or some drift will exist, but it can be scaled down or corrected in some way.
Zero-point thermal drift is an important target that affects the function of high-frequency pressure sensors, and has been widely emphasized. Internationally, it is believed that the zero thermal drift only depends on the inequality of the force sensitive resistor and its temperature nonlinearity, but in fact, the zero thermal drift is also related to the reverse leakage of the force resistor. In this regard, polysilicon can absorb heavy metal impurities from the substrate, thereby reducing the reverse leakage of the force resistor, improving the zero point thermal drift, and improving the function of the sensor.
What are the other ways to reduce and correct the electrical drift, and what are the important effects of zero drift that affect the measurement accuracy and sensitivity of high-frequency pressure sensors?
The use of zero drift can eliminate the thermal zero drift of high-frequency pressure sensors, which refers to the phenomenon that when the input of the amplifier is short-circuited, there is an irregular, slowly changing voltage at the input. The primary cause of zero drift is the effect of temperature change on transistor parameters and fluctuations in supply voltage, etc., and in most amplifiers, the zero drift of the pre-stage has the greatest impact, and the more stages and the larger the amplification, the more severe the zero drift.
The magnitude of the drift depends primarily on the selection of the strain material, and the structure or composition of the material determines its stability or heat sensitivity.
It is also very important to process the material after selection, the process is different, and the strain value of different effects will be produced, and the key is also to stabilize the bridge value or change the process law after some aging and other conditioning.
There are many adjustment methods for drift, most of which are determined according to the conditions or production needs of the manufacturer, and most manufacturers control the zero drift very well. Temperature conditioning can be compensated by internal temperature resistance and heating zero sensitivity resistance, aging, etc.
For transformers with selected circuit conversion, the drift of the circuit part can be compensated by the selected components and a more appropriately designed circuit.
Strain materials should be selected with high sensitivity coefficient and small temperature change.
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