To measure the illumination of premises, a special device is used, which includes a light sensor. Such measurements are made in production and in the office - wherever it is necessary to comply with certain lighting standards. Based on the measurements made, specific decisions are made to improve this parameter. Such measurements are very important, since the he alth of people who work in such premises for a long time directly depends on this.
Insufficient lighting can lead to injury or gradual loss of vision due to overwork.
The unit of measurement is Lumen. In addition to measuring instruments, the light sensor is used in automation circuits. An example of such use is the automatic switching on or off of street lighting depending on the time of day. In addition, such sensors are widely used in production, where they are involved in process control. Let's look at the principle of operation of these devices with simple examples.
The main element in such circuits is a photoresistor, whichchanges its internal resistance depending on the light level. This property has been observed in semiconductor devices. Pretty
a large number of photoresistors for a wide variety of applications. The main parameters of such devices are the maximum voltage, current and sensitivity of the device itself. The light sensor thus consists of a light-sensitive element, a control circuit and an output stage that controls the relay or goes to the indication.
You can assemble a simple device that will control street lighting, for example, a private house, on your own. This does not require scarce parts - everything you need can be bought in specialized stores. A simple scheme for the manufacture of the device itself can be found on the Internet. The light sensor in this case will be located on the street, and best of all on the roof of the house so that it
did not fall a shadow. The output part of the circuit, as a rule, is the relay contacts, which control the lighting. In addition, in the cold season, such a device can be used to control heating. As you can see, an outdoor light sensor can perform several useful functions at once. You will have a smart home that will turn on additional batteries at night.
Modern light sensors have good performance and are reliable in operation. Built-in adjustment allows you to set the most optimal mode of operationstreet lighting. Additional delay circuits prevent false triggering of the device. After receiving a signal to turn on or turn off the lighting, there will be a time delay for the execution of this command. The remote sensitive part of the device allows you to implement the remote control mode. Typically, sensors are equipped with a switch that allows you to easily return to manual control mode.
