First, the main technical requirements for the sensor
(1) The conversion range is consistent with the measured actual variation range (amplitude, frequency). (2) The conversion accuracy meets the entire test system to allocate the accuracy indicator of the sensor according to the total accuracy (generally better than the system accuracy), and the conversion speed should meet the requirements of the whole machine. (3) Special requirements that can meet the test media and the environment, such as high temperature resistance, high pressure resistance, anti-corrosion, explosion-proof, anti-electromagnetic interference, small size, light quality, small power consumption. (4) Can meet the requirements of users' reliability and maintainability.
Second, the type of sensor is available
(1) Large signal output sensor: Direct output 0-5V, 0-10V, etc. (2) Digital sensors have high measurement accuracy, strong anti-interference ability, facilitating long-distance transmission. In addition, if the output satisfies the TTL level standard, the I / O port or interrupt inlet can be directly accessed. If not, it is necessary to transform or zoom in. Generally, when entering the microcontroller I / O port or expansion port, it is also necessary to isolate by photoelectric coupling. (3) Integrated sensors will be integrated with strain, strain bridge, linearization, bridge amplification, etc. (4) The fiber optic sensor avoids electromagnetic interference of the circuit system. In addition, there is a BCD code output, the Gray code is output.
