How to choose frequency of ultrasonic transducer

views：108 author：admin source：Hiwave time：2025-02-13 catogory：Frequently Asked Questions
What is an Ultrasonic Probe? An ultrasonic probe, also known as an ultrasonic transducer, is a sensor device that conve……
What is an Ultrasonic Probe?
An ultrasonic probe, also known as an ultrasonic transducer, is a sensor device that converts electrical energy into sound energy and vice versa within the ultrasonic frequency range. It is one of the core components in an ultrasonic scanning microscope.
In water immersion ultrasonic scanning microscopes, various types of ultrasonic probes with different frequencies and focal lengths are commonly used. Examples include:
 Long Focal Length 5 MHz
 Long Focal Length 15 MHz
 Long Focal Length 25 MHz
 Short Focal Length 50 MHz
 Short Focal Length 75 MHz
These probes are designed to meet specific requirements for resolution and penetration depth, making them suitable for different applications in nondestructive testing and material analysis.
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Hiwave Ultrasonic Transducer
How to Choose the Frequency of an Ultrasonic Probe?
The frequency of an ultrasonic probe can be understood as the number of times per unit time that sound energy and electrical energy are converted. Higher ultrasonic frequencies provide higher detection precision. The focal length of an ultrasonic probe, on the other hand, is related to the detectable depth of the ultrasonic transducer. Additionally, the transmission of ultrasonic waves is also influenced by the material being tested. 
Generally, low frequency probes have relatively longer focal lengths, while high frequency probes have relatively shorter focal lengths.
frequency resolution and penetration
frequency resolution and penetration
Factors to Consider When Choosing Ultrasonic Probe Frequency Detection Precision
Higher frequencies (e.g., 50 MHz, 75 MHz) offer greater resolution and are suitable for detecting very fine defects or features in materials. These are often used in applications such as semiconductor inspection and microelectronics.
 
Penetration Depth:
Lower frequencies (e.g., 5 MHz, 15 MHz) penetrate deeper into materials but with lower resolution. They are ideal for thicker materials or when inspecting components with significant thickness variations.
 
Material Characteristics:
The transmission of ultrasonic waves is affected by the material’s properties, such as density and acoustic impedance. For example, softer materials may require lower frequency probes to achieve sufficient penetration, while harder materials might benefit from higher frequency probes for better resolution.
 
Focal Length:
The focal length of the probe determines the depth at which the ultrasound beam is focused. Longer focal lengths are generally associated with lower frequency probes and are used for deeper inspections, whereas shorter focal lengths are used with higher frequency probes for more superficial inspections.
Common Frequency Selection Ranges
Low Frequency Probes:
5 MHz: Suitable for thick materials or deep inspections where high penetration is needed.
15 MHz: Offers a balance between penetration depth and resolution, suitable for generalpurpose inspections.
 
Medium Frequency Probes:
25 MHz: Provides higher resolution than lower frequencies while still maintaining reasonable penetration depth. Ideal for detailed inspections of moderately thick materials.

 

High Frequency Probes:
50 MHz: Used for very fine detail detection in thinner materials or surface layers.
75 MHz: Offers extremely high resolution, suitable for detecting minute defects in highly precise applications such as semiconductor wafers and microelectronics.

 

By considering these factors, you can select the appropriate ultrasonic probe frequency for your specific application needs.
If you need more information,please contact Ivy
Email:service@ihiwave.com
Website:www.ehiwave.com
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How to choose frequency of ultrasonic transducer
               

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