Contents
How the ultrasonic can measure the distance?
As the name indicates, ultrasonic sensors measure distance by using ultrasonic waves. The sensor head emits an ultrasonic wave and receives the wave reflected back from the target. Ultrasonic Sensors measure the distance to the target by measuring the time between the emission and reception.
How much distance can ultrasonic waves travel?
They DO NOT locate objects moving about in a 3-dimensional space. They DO NOT measure farther than about 70 feet (21 meters). They DO NOT measure at very high repetition rates. Due to speed of sound limitations the fastest rate is 200 Hz at a max distance of about 24 inches.
Can ultrasonic sensors detect distance?
Ultrasonic sensors can measure the distance to a wide range of objects regardless of shape, color or surface texture. They are also able to measure an approaching or receding object. By using “non-contact” ultrasonic sensors, distances can be measured without damage to the object.
How is the motion of an ultrasonic sensor measured?
Motion in the measuring direction of each ultrasonic sensor is measured using the change of measured distance data, and motion in the vertical direction is measured using the change of measuring range. Figure 3. Measurement of motion by proposed sensor system
What is the purpose of an ultrasonic range finder?
The ultrasonic range finder is used to measure the distance between the sensor and its object. When it works, it first emits a sound wave at a specific ultrasonic frequency. After a certain period of time, it receives the sound wave reflected by objects in the detection area.
How is the distance from an ultrasonic source calculated?
The distance from the measured object can be calculated by recording the time between sending and receiving and combining the real-time sound velocity under the current conditions (such as local temperature). The coverage shape of an ultrasonic range finder is usually a cone with the ultrasonic generator as its apex.
How are sound waves used to measure distance?
When the sound wave hits an object, it is reflected in various directions. So some of that energy returns to the sensor and triggers it, therefore measuring the distance.