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Ultrasonic Frequency Spectrum
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults and thus, 20 kHz serves as a useful lower limit in describing ultrasound. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy. The reflection signature can reveal details about the inner structure of the medium. The most well known application of this technique is its use in sonography to produce pictures of fetuses in the human womb. There are a vast number of other applications as well. - Wikipedia







Application 0 Hz 10 Hz 100 Hz 1 kHz 10 kHz 18 kHz 50 kHz 100 kHz 200 kHz 1 MHz 10 MHz 20 MHz 100 MHz
Oil Well Drilling                      
Brazing                        
Thickness Gauging                  
Chemical Processing              
Cleaning                
Degassing                  
Flaw Detection            
Degreasing                
Welding                      
Dispersing              
Flow Metering              
Electroplating                  
Sonar              
Impregnating              
Liquid Gauging                  
Pickling                  
Shake Table                      
Coagulating                    
Emulsifying                  
Medical                      
Remote Control                        
Precipitators                    
Plastic Welding                        
Therapy                      
Machining                          
Soldering                        
  Infra-
sonic		 Sonic Ultrasonic


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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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