Ultra-Practical Guide! Step-by-Step Instructions for Accurately Calculating Ultrasonic Transmission Distance [Dayu Electronics]
The calculation of ultrasonic transmission distance primarily depends on two key factors: the frequency of the ultrasonic wave and its propagation speed in a specific medium. Below, I will explain in detail how to calculate the ultrasonic transmission distance based on these two parameters.
1. Frequency of the Ultrasonic Wave
Ultrasonic waves typically have a frequency greater than 20 kHz, which distinguishes them from ordinary sound waves (the human audible range is between 20 Hz and 20 kHz). However, the frequency has a relatively small effect on the propagation speed in a medium, especially in gases (such as air). In solids and liquids, high-frequency ultrasonic waves may lose some energy due to scattering, but this does not directly affect their propagation speed.
2. Propagation Speed of Ultrasonic Waves in a Medium
Ultrasonic waves propagation speed depends on the medium in which they travel. Different media (such as air, water, and solids) have different sound speeds. For example, under standard atmospheric pressure and temperature, the speed of sound in air is approximately 343 meters per second (or about 1235 kilometers per hour, but note the unit conversion error here; it should be 343 meters per second or 1234.8 kilometers per hour, though meters per second is typically used as the unit for sound speed), while the speed in water is higher, at approximately 1484 meters per second (or about 5342.4 kilometers per hour, again noting the unit conversion).
3. Calculating the Ultrasonic Transmission Distance
The ultrasonic transmission distance (d) can be calculated using the following formula:
d = v × t
Where v is the propagation speed of the ultrasonic wave in the medium (in meters per second), and t is the time taken for the ultrasonic wave to travel from transmission to reception (or after reflection) (in seconds).
Example
Assuming the propagation speed of ultrasonic waves in air is 343 meters per second, and the time taken from transmission to reception (after reflection from an object) is 0.01 seconds, the ultrasonic transmission distance would be:
d = 343 m/s × 0.01 s = 3.43 meters
Important Considerations
The propagation speed of ultrasonic waves can be affected by physical properties of the medium such as temperature, humidity, and density, so these factors need to be considered in precise measurements.
In practical applications, ultrasonic sensors typically measure the time difference between transmission and reception of ultrasonic waves and use the known sound speed to calculate distance.
Ultrasonic waves travel faster in solids than in liquids and gases, with less scattering, making them widely used in industrial inspection and other fields.
I hope the above explanation helps you understand how to calculate ultrasonic transmission distance.