Ultrasonic sensor is the choice for short distance application

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【概要描述】Ultrasound refers to signals that are beyond the range of human hearing, usually in the range of 40 to 70 kHz. These signals are used like radar. They will radiate to the target and reflect back to the source. They are cheap, flexible, and especially suitable for short-range applications, especially the design of automobiles, home and industrial robots. Ultrasonic sensors are sometimes used in combination with microwave/millimeter wave radars and cameras to provide different but complementary views of the surrounding environment in automotive and industrial applications. If you are looking for a sensor that can not only detect the presence of the target, but also tell you how far the target is, then ultrasound may be your ideal choice. Ultrasonic signal refers to the signal above the human hearing range, about 30 to 480 kHz. For ultrasonic sensing, the most widely used range is 40 to 70 kHz. Frequency determines the range and resolution; Lower frequencies produce the maximum sensing range. The common frequency is 58 kHz, the measurement resolution is 1 cm, and the maximum range is 11 meters. At 300 kHz, the resolution may be as low as 1 mm, but the maximum distance of this frequency range is about 30 cm. The ultrasonic transceiver radiates the signal through the piezoelectric transducer. When the signal hits the target, it will generate a reflection signal. The signal is received at the transceiver. The transceiver measures the time of transmission and return, and then calculates the distance using the sound velocity in the air. The sound speed in free space is 1120, which varies with temperature and other surrounding factors, but it is a good average value for range calculation. Ultrasonic technology has entered a wide range of applications. The largest areas may be proximity detection and distance measurement. Other include liquid level detection in tanks, flow measurement systems and imaging products. Most of the newer applications are for consumer electronics, Automotive and industrial/robotics.

Ultrasound refers to signals that are beyond the range of human hearing, usually in the range of 40 to 70 kHz. These signals are used like radar. They will radiate to the target and reflect back to the source. They are cheap, flexible, and especially suitable for short-range applications, especially the design of automobiles, home and industrial robots. Ultrasonic sensors are sometimes used in combination with microwave/millimeter wave radars and cameras to provide different but complementary views of the surrounding environment in automotive and industrial applications.
If you are looking for a sensor that can not only detect the presence of the target, but also tell you how far the target is, then ultrasound may be your ideal choice. Ultrasonic signal refers to the signal above the human hearing range, about 30 to 480 kHz. For ultrasonic sensing, the most widely used range is 40 to 70 kHz. Frequency determines the range and resolution; Lower frequencies produce the maximum sensing range.
The common frequency is 58 kHz, the measurement resolution is 1 cm, and the maximum range is 11 meters. At 300 kHz, the resolution may be as low as 1 mm, but the maximum distance of this frequency range is about 30 cm. The ultrasonic transceiver radiates the signal through the piezoelectric transducer. When the signal hits the target, it will generate a reflection signal. The signal is received at the transceiver. The transceiver measures the time of transmission and return, and then calculates the distance using the sound velocity in the air.
The sound speed in free space is 1120, which varies with temperature and other surrounding factors, but it is a good average value for range calculation. Ultrasonic technology has entered a wide range of applications. The largest areas may be proximity detection and distance measurement. Other include liquid level detection in tanks, flow measurement systems and imaging products. Most of the newer applications are for consumer electronics, Automotive and industrial/robotics.

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