To measure the illumination of the premises using a special device, which includes a light sensor. Such measurements are made at the factory and in the office - wherever it is necessary to comply with certain lighting standards. Based on the measurements taken, specific decisions are made to improve this parameter. Such measurements are very important, since the health of people who work in such rooms for a long time directly depends on this.
Inadequate lighting can lead to injuries or gradual loss of vision due to overwork.
The unit of measure is Lumen. In addition to
measuring instruments, a 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 schemes is a photoresistor, which changes its internal resistance depending on the level of illumination. This property has been observed in semiconductor devices. Currently produced quite
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 in this way consists of a light-sensitive element, a control circuit and an output stage that controls the relay or goes to the display.
To assemble a simple device that will control street lighting, for example, a private house, you can do it yourself. For this, scarce parts are not needed - everything you need can be bought in specialized stores. A simple scheme for manufacturing 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
the shadow did not fall. 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, a street 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 characteristics and are reliable in operation. Built-in adjustment allows you to configure the most optimal mode of street lighting. Additional delay circuits prevent false alarms. After receiving a signal to turn on or off the lighting, there will be a time delay for the execution of this command. The remote sensitive part of the device allows for remote control. Typically, the sensors are equipped with a switch, with which you can easily return to manual control.