The working principle of the area measuring instrument has been understood by everyone, and its use reduces the error of irregular plane area measurement. Because there is some error in the measurement of irregular plane area before there is no area measuring instrument, it is divided into several small pieces, and then the approximate area of ​​the object is obtained by summing, and the smaller the rectangle is, the higher the accuracy is. The error of such a measurement method still exists, and the measurement work is complicated.
The measuring sensor is one of the key parts of the area measuring instrument. Its performance is directly related to the measuring accuracy. Optical sensors can be divided into two types: First, photoelectric sensors, which have the characteristics of small size, high speed, high cost, high installation requirements, suitable for relatively clean environment, and secondly, photosensitive sensors, which use fluorescent lamps as common light sources. The cost and the installation conditions and the use environment are relatively low. The interface circuit between the area measuring instrument and the measuring sensor can be selected according to the specific circumstances.
Area measuring instruments are available for simultaneous measurement or asynchronous measurement. The so-called synchronous measurement method (rotational speed detection) refers to the on-line detection of the speed of the motor, and based on the speed of the motor, the linear velocity of the measured object is calculated. The asynchronous measurement method is based on the rated speed of the motor to calculate the linear velocity of the measured object, but the fluctuation of the grid voltage will affect the measurement accuracy.
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