How does an infrared light curtain work, and what is the principle of infrared light generation?

A plurality of infrared emitting tubes are installed at equal intervals on one side of the light curtain, and the same number of equally arranged infrared receiving tubes are correspondingly on the other side, and each infrared emitting tube corresponds to a corresponding infrared receiving tube, and is installed on the same straight line. When there is no obstacle between the infrared emitting tube and the infrared receiving tube in the same straight line, the modulation signal (optical signal) emitted by the infrared emitting tube can reach the infrared receiving tube smoothly. After the infrared receiving tube receives the modulation signal, the corresponding internal circuit outputs a low level, and in the case of an obstacle, the modulated signal (optical signal) emitted by the infrared transmitter cannot reach the infrared receiving tube smoothly, and the infrared receiving tube cannot receive the modulation signal at this time, and the corresponding internal circuit output is high.

When no object passes through the light curtain, the modulation signal (optical signal) from all the infrared emitting tubes can reach the corresponding infrared receiving tube on the other side, so that the internal circuitry is all output low. In this way, information about the presence or absence of an object can be detected by analyzing the state of the internal circuit.

The number of infrared transmitting and receiving paths for safety light curtains can theoretically be infrequent, and considering the height of the actual light curtain and the spacing between the upper and lower paths, it will generally not exceed 48.

The safety light curtain is divided into straight line scanning mode and cross scanning mode, in the straight line scanning mode, single-chip microcomputer.

Each time, the same path selection signal is sent to the sender and receiver, that is, the first channel sends the first channel to the first channel, and the second channel sends the second channel to receive 、...The fifteenth road is sent to the fifteenth road, and the sixteenth road is sent to the sixteenth road. In cross-scan mode, the microcontroller sends a different path selection signal to the sender and receiver each time. That is, the first road sends the second road to receive, and the second road sends the first way to receive 、......The fifteenth road is sent to the sixteenth road, and the sixteenth road is sent to the fifteenth road.

In contrast, the cross-scan mode is more accurate in measuring the height of the object and has the highest detection accuracy at the center of the detection area1 3. The minimum detection height can be reduced to 2 to 3 in straight line scan mode. However, in consideration of practical needs, safety light curtains are now commonly used in the form of straight line scanning.

One launches, one receives. If the receiver can't receive it, it is considered blocked. Tell the elevator to reopen the door.

The principle of infrared spectroscopy is that when a beam of infrared light with a continuous wavelength passes through the substance, and the vibration frequency or rotation frequency of a group in the molecule of the substance is the same as the frequency of infrared light, the molecule will absorb the energy from the original ground state vibration level) kinetic energy level to the higher energy vibration energy level, and the molecule absorbs infrared radiation after the vibration and rotation level transition, and the wavelength of light is absorbed by the substance. Therefore, infrared spectroscopy is essentially a method based on the internal origin of the molecule.

Well, infrared rays are mainly irradiated locally, which promotes blood circulation and improves metabolism. However, different wavelengths work differently. It can relieve local inflammation.

The application principle of infrared measurement light curtain is that the light curtain sensor emitting invisible infrared light, which is received by the receiver to form a protective light curtain. When the detected object passes, the infrared light will be blocked, causing the light intensity of the receiver to change the fiber, and its change value triggers the switch signal output to realize the detection function.

Measuring light curtain is a reliable detection and measurement method, for the external size of the object can achieve non-contact automatic measurement, this technology can be applied to logistics sorting, will achieve more ideal results. The application of light curtain measurement technology in logistics sorting can eliminate the occurrence of mechanical grading and injury, and can achieve highly dynamic and accurate detection, measurement and selection.

At present, the infrared measurement light curtain can be widely used in logistics sorting, spraying, detection holes, object dimensions, measurement of long jump, industrial object positioning, unilateral deviation correction, bilateral deviation correction, vehicle separation, object volume measurement and other fields, with minimum accuracy, high precision, and stable simulation of the shed chain.

The working principle of infrared optical fiber: infrared remote control has two components: sending and receiving. The transmitter uses a single-chip microcomputer to code and modulate the binary signal to be sent into a series of pulse burst signals, and emits infrared signals through the infrared emitting tube.

Infrared reception completes the reception, amplification, detection, and shaping of infrared signals, and demodulates the remote control coding pulse.

In order to reduce interference, the most cheap and reliable integrated infrared receiving head (HS0038, which receives infrared signal frequency of 38kHz, period of about 26 S) receives infrared signals, and it amplifies, detects, and shapes the signal at the same time to obtain the encoded signal of TTL level, and then sends it to the single-chip microcomputer, which is decoded and executed by the single-chip microcomputer infiltration wheel to control the relevant objects.

The infrared transmitting part is composed of 51 single-chip microcomputer, keyboard, infrared light-emitting diode and 7-segment digital tube. The keyboard is used for inputting instructions, and the 51 single-chip microcomputer detects the state of the keys on the keyboard, and modulates the infrared signal, and the light-emitting diode produces infrared rays, and the digital tube is used to display the key value sent.

The infrared receiving part is composed of Cong Xinxin 51 single-chip microcomputer, integrated infrared receiving head HS0038 and 7-segment digital tube. 51 single-chip microcomputer detects HS0038, decodes the data received by HS0038, and displays the received key value through the digital tube.

The measuring light curtain is mainly used to detect the measurement object, such as size, size, whether it meets the specified requirements, etc. It is a special photoelectric sensor, the main components of which are a light emitter and a light receiver and a controller.

The control principle is: the luminaire emits infrared light signals, which are directly received by the light receiver to form a protective light curtain, and realize the function of detecting and measuring the external dimensions of the object in a scanning way, with the controller and software.

iStetech's measurement light curtain is widely used, covering almost all detection and measurement fields, such as precision correction, deviation correction, alignment correction, vehicle separation, object detection, shape measurement, small parts detection, object size detection, volume measurement of logistics sorting, component counting, toll station vehicle detection, vehicle overrun inspection (length, width and height), channel passenger flow detection, object movement trajectory detection, human body detection, safety alarm, assembly line detection, automatic spraying, product counting detection, Blanking count detection and so on.

A plurality of infrared emitting tubes are installed in the luminaire of the light curtain, and the receiver of the light curtain is also equipped with the same number of infrared receiving tubes in the same arrangement.

Each infrared emitting tube and infrared receiving tube are mounted on the same straight line, so that a series of infrared rays are formed between the light curtain emitter and the receiver, forming a light curtain.

When an obstacle passes through and blocks the infrared rays, the infrared receiver receives a modulated signal and outputs a high level in the internal circuit, and vice versa, a low level in the internal circuit.

Based on the state of the internal circuit, it is possible to determine whether there is an object in the light curtain.

Safety light curtains are used for area protection, such as dangerous areas to prevent people or human fingers from entering, at which time safety light curtains can be installed. There is a self-test function inside the safety light grid, and when the safety light barrier fails, the normally closed output of the safety light grid becomes normally open. When a safety light barrier obscures any one or more light spots, only one switching signal is output.

Mott intelligent safety light barrier.

Mott intelligent measurement grating is used for measurement, there is no self-test function, each optical point corresponds to 1 output, and the output of the measurement grating is a 10-base data packet after signal integration.

Infrared light was discovered in the laboratory by British scientist Herschel in 1800. It is an electromagnetic wave with a wavelength longer than red light, and has a pronounced thermal effect that can be felt but not seen. Collapse scientists have discovered that when a certain wavelength of light (visible or invisible) hits the surface of certain metals and other materials, the metals and other materials will be cautious and emit a stream of electrons, which is called the photoelectric effect.