An ultrasonic sensor is an electronic device that measures the distance of a target object by emitting ultrasonic sound waves, and converts the reflected sound into an electrical signal. Ultrasonic sensors are divided into split type and integrated type. The split type contains a transmitter and a receiver, which need to be used in pairs. The integrated sensor, as the name suggests, is the combination of transmitter and receiver. In terms of measurement accuracy, the accuracy of the split type is higher than that of the integrated sensor. However, there is no advantage in terms of volume. When the weight of the equipment and other external factors need to be considered, the integrated sensor is preferred (such as a small drone).
The measurement accuracy of ultrasonic sensors is greatly affected by temperature, humidity, and infrasound waves that exist in nature. If the measurement accuracy is very high, it is not recommended to use ultrasonic sensors, and other optical measuring instruments can be used instead. Ultrasonic transducers have obvious shortcomings, but they are still widely used in equipment and places such as drones and parking lots. Because of their very cheap price, it can be said that they are a very cost-effective product.