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The difference between sensor resolution, sensitivity and accuracy

by:Rika Sensors     2021-10-17
The difference between sensor resolution, sensitivity and accuracy
In order to obtain information from the outside world, people must resort to sensory organs. However, people's own sensory organs are far from enough in the study of natural phenomena and laws and production activities. To adapt to this situation, sensors are needed. Therefore, it can be said that the sensor is an extension of the human five sense organs, also known as the electrical five sense senses.

Sensors have already penetrated into a wide range of fields such as industrial production, agriculture, space development, ocean exploration, environmental protection, resource investigation, medical diagnosis, biological engineering, and even cultural relic protection. It is no exaggeration to say that from the vast space, to the vast ocean, to various complex engineering systems, almost every modern project is inseparable from a variety of sensors.

In modern industrial production, especially in automated production processes, various sensors are used to monitor and control various parameters in the production process to make the equipment work in a normal or optimal state, and to make the product reach the best quality . Parameter indicators include sensitivity, resolution, accuracy, etc., but many people are not very clear about the difference between these three parameters, which leads to large and small problems in use. Below, we will discuss the sensitivity, resolution and accuracy of the sensor. Let me briefly introduce the difference.


concept: refers to the ratio of the sensor's output change △y to the input change △x under steady-state working conditions, that is, the ratio of the dimensions of the output and the input.

Sensor sensitivity is the slope of the output-input characteristic curve. If the sensor's output and input show a linear relationship, the sensitivity S is a constant. Otherwise, it will change with the change of input. When the dimensions of the sensor's output and input are the same, the sensitivity can be understood as the magnification. Improve the sensitivity and obtain higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the worse the stability.


concept: refers to the ability of the sensor to detect the smallest change in the measurement. That is, if the input volume changes slowly from a certain non-zero value. When the input change value does not exceed a certain value, the output of the sensor will not change, that is, the sensor cannot distinguish the change of this input. Only when the input change exceeds the resolution, the output will change.

Resolution is usually understood as the A/D conversion accuracy or the smallest change that can be sensed and accuracy usually refers to: A/D, sensor circuit other factors and other factors, the error is divided by the displayed percentage. Digital instruments are usually determined by the accuracy of the number of digits of the A/D converter, which is the maximum percentage error of the sensor repeatedly measuring the same standard value. It is the index resolution that measures the accuracy after calibration is several times better than the accuracy. The resolution has a negative correlation with the stability of the sensor.


concept: refers to the ratio of the value of plus or minus three standard deviations near the true value to the range, refers to the maximum difference between the measured value and the true value; resolution-refers to the value that causes the display The minimum measured value to change; should be separated from the sensitivity coefficient (sensitivity coefficient-refers to the ratio of output to input).

The accuracy of the general domestic temperature sensor is divided into two levels, A and B. The national standard stipulates as follows: According to the difference between the output value of the sensor and the true value of the measured temperature, A level: no more than ±(0.15℃ +0.002*sensor range); Class B: not greater than ±(0.30℃+0.005*sensor range). Therefore, if higher measurement accuracy is required, a sensor with a smaller range should be used. Resolution, 'usually determined by the number of bits of the A/D converter

At the same time, as the recent research of Rika Sensors shows, the benefits of improved productivity and firm performance can make implementing basic management practices worth it.
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