How to improve the overall performance of sensors
Release time:
2020-07-30
There are many technical specifications that determine sensor performance. Requiring a sensor to meet all these specifications not only poses difficulties in design and manufacturing but is also often unnecessary in practice. Therefore, based on actual needs and feasibility, we should relax the requirements for secondary specifications while ensuring that the primary specifications are met, thereby achieving a high performance-to-price ratio. In the design and manufacture of sensors, rationally selecting their structure, materials, and parameters is a prerequisite for guaranteeing a favorable performance-to-price ratio.
The performance of a sensor is the standard for evaluating whether it can be applied to measurement. Therefore, manufacturers are constantly seeking effective ways to enhance sensor performance. Regarding improving the overall performance and output of sensors, you can refer to the following three methods:
1. Reasonably select the structure, materials, and parameters.
There are many technical specifications that determine sensor performance. Requiring a sensor to meet all these specifications not only poses difficulties in design and manufacturing but is also often unnecessary in practice. Therefore, based on actual needs and feasibility, we should relax the requirements for secondary specifications while ensuring that the primary specifications are met, thereby achieving a high performance-to-price ratio. In the design and manufacture of sensors, rationally selecting their structure, materials, and parameters is a prerequisite for guaranteeing a favorable performance-to-price ratio.
2. Employ linearization technology
The advantage of requiring sensors to have linear outputs lies in the following: 1) It simplifies theoretical analysis and practical calculations; 2) It facilitates calibration and data processing; 3) It makes scaling, fabrication, installation, and debugging easier, and helps improve measurement accuracy; 4) It eliminates the need for nonlinear compensation circuits. As described above, only when the sensor’s output has a linear relationship with its input can distortion-free reproduction be guaranteed. However, in practice, it is extremely difficult to achieve perfect linearity in sensors; therefore, various methods must be employed to linearize the output/input characteristics and thereby enhance the sensor’s overall performance.
3. Adopt differential technology
In many cases, the nonlinear terms in the system’s characteristic curve consist only of second-order terms, which are symmetric about the origin and exhibit an approximately linear segment within a certain range near the origin. By employing differential techniques, the total output can be made to eliminate both the zero-point output and even-order nonlinear terms, thereby achieving a relatively wide, symmetrically centered, approximately linear operating range around the origin. As a result, not only is nonlinearity reduced, but sensitivity is also doubled, effectively canceling out common-mode errors. Differential techniques have found widespread application in sensors such as resistive strain gauges, inductive sensors, and capacitive sensors.
Therefore, by selecting sensitive materials for sensors and employing advanced technological approaches, the performance of sensors can be enhanced, enabling products to exhibit long-term stability, high linearity, and strong anti-interference capabilities.
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