There is a certain error in the measurement of irregular plane area. Divide it into several small blocks, and then sum up to get the approximate area of ​​the object. The smaller the rectangle, the higher the precision. The working principle of the area measuring instrument is that the light source and the light sensor are divided into two rows and fixed on the support in parallel, and the measured object passes through the motor drag device horizontally and uniformly through the light source and the light sensor. When the measured object passes through the light source and the light sensor, the local light source of the object is blocked, and the corresponding light sensor output level is /10, otherwise the output level is /00. The information of the light sensor is read by the computer, and then the number of ten is counted and then summed. Scan the QR code below to follow the Top WeChat official WeChat (Also can WeChat search: Top Instrument): 1ton -10ton Endless Round Sling
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The measuring sensor is one of the key parts of the area measuring instrument. Its performance is directly related to the measuring accuracy. The optical sensor in Fig. 2 can be divided into two kinds: First, the photoelectric sensor, it has the characteristics of small size, high speed, high cost, high installation conditions, suitable for relatively clean environment; the second is a photosensitive sensor, which uses fluorescent lamps as a common The light source, its cost and the installation conditions, the use of the 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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Area sensor related sensor analysis