What is the working principle of tcrt5000 infrared photoelectric sensor and how to use it to track and avoid obstacles?

Target to be measured

According to the infrared radiation characteristics of the measured target, an infrared system can be set up.

atmospheric attenuation

When the infrared radiation of the measured object passes through the earth's atmosphere, the infrared radiation emitted by infrared source will be attenuated due to the scattering and absorption of gas molecules, various gases and various sol particles.

optical receiver

It receives part of the infrared radiation of the target and transmits it to the infrared sensor. Equivalent to a radar antenna, usually an objective lens.

Radiation modulator

Modulate the radiation from the target to be measured, provide target azimuth information, and filter out large-area interference signals. Also known as modulation panel and chopper, it has many structures.

infrared detector

This is the core of the infrared system. It is a sensor that uses the physical effect of the interaction between infrared radiation and matter to detect infrared radiation. In most cases, it uses the electrical effect of this interaction. This kind of detector can be divided into photon detector and thermal detector.

Detector cooler

Because some detectors must work at high temperature, the corresponding system must have refrigeration equipment. After cold storage, the equipment can shorten the response time and improve the detection sensitivity.

Signal processing equipment

The detected signals are amplified and filtered, and information is extracted from these signals. Then this kind of information is converted into the required format, and finally transmitted to the control device or display.

Display device

This is the terminal equipment of infrared equipment. Commonly used displays include oscilloscopes, picture tubes, infrared sensitive materials, indicating instruments and recorders.

According to the above process, the infrared system can complete the measurement of corresponding physical quantities. The core of infrared system is infrared detector, which can be divided into thermal detector and photon detector according to different detection mechanisms. Let's take the thermal detector as an example to analyze its principle.

The thermal detector uses the thermal effect of radiation to increase the temperature of the detection element after receiving the radiant energy, thus changing the temperature dependence performance in the detector. Radiation can be detected by detecting a change in one of the properties. In most cases, radiation is detected by thermoelectric changes. When elements are irradiated and cause non-electric physical changes, the corresponding electric changes can be measured through appropriate transformation.

Infrared sensor has played a great role in modern production practice. With the improvement of detection equipment and other technologies, infrared sensors can have more performance and better sensitivity.

Tracking means that the infrared system can be set according to the infrared radiation characteristics of the measured target.

Obstacle avoidance is that the radiation modulator modulates the radiation from the object to be measured, provides the target orientation information, and can filter out large-area interference signals. Also known as mask chopper, it has many structures.

The infrared emitting diode of the extended data TCRT5000 sensor continuously emits infrared rays. When the emitted infrared ray is not reflected back or reflected back, but the intensity is not strong enough, the phototransistor is always in the off state, the negative terminal of the comparator is equivalent to grounding, and the output terminal of the comparator is at a high level, indicating that the diode is lit;

When the detected object appears in the detection range, the infrared ray is reflected back with sufficient intensity, the phototransistor is saturated, the negative terminal of the comparator is at a high level, and the output terminal of the comparator is at a low level, indicating that the diode is always in the off state.

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