Hi all,i just wondered if its possible to run equal amounts of ultrasonic transducers on the same tank but say have 3 transducers running at 40 khz and 3 running at 28 khz at the same time on the same cleaning tank,has this been done?
https://www.ctgclean.com/application-of-multiple-frequency-ultrasonics
"Multiple Frequency Technologies
There are two basic ways in which two or more ultrasonic frequencies are introduced into a single ultrasonic cleaning tank in modern day equipment. One is the relatively old method of supplying the different frequencies concurrently or in sequence from a number of transducers or transducer arrays each of which is designed to operate at a single frequency and has its own discreet generator. The second method is relatively new and utilizes a multiple frequency generator which drives universal transducers capable of operating at more than one frequency. The universal transducers produce ultrasound at each of the generator’s operating frequencies. The generator is programmed to supply different sweeping frequencies in succession to the single transducer array."
. . .
"The chronological history of concurrent multiple ultrasonic frequency equipment starts in 1959 with U.S. Pat. No. 2,891,176 in which Norman Branson teaches three transducer arrays driven by three generators where the operating periods of these generators overlap. In 1974 a tank was designed and built at Branson Cleaning Equipment Company that had an array of 25 kHz transducers on the bottom and a second array of 40 kHz transducers on one side; each of these arrays was simultaneously driven by the appropriate frequency generator. Similar systems were designed and built by others in the 1970's, e.g., Blackstone Ultrasonics, but no useful application was found for the technology. In 1981 U.K. Pat. No. 2,097,890A taught three transducer arrays driven by three generators on different phases of a three-phase line. In the mid 1990's Amerimade Technology sold a system consisting of a tank with angled walls and two arrays of transducers on different walls, each array was driven by a different frequency generator, one sweeping around 71.5 kHz and the other sweeping around 104 kHz. Also at that time, Zenith sold a two-array two-generator system operating at 80 kHz and 120 kHz called "crossfire" because the different frequencies intersected at 90 degrees."
. . .
"In U.S. Pat. No. 5,656,095 Honda, et al. teaches high frequency transducers and low frequency transducers on the tank where the high frequency transducers are normally driven and the low frequency transducers are driven for short periods of time to intermittently destroy the high frequency bubbles. In U.S. Pat. Nos. 5,865,199 and 6,019,852 Pedziwatr et al. teaches two arrays of transducers interspersed on the tank and driven by two different frequency generators. In U.S. Pat. No. 5,909,741 Ferrell teaches two arrays of transducers on different angled walls of a plastic container and driven by different frequency generators. In 2004 Crest Ultrasonics introduced a three-frequency product"
. . .
"In U.S. Pat. Nos. 5,865,199 and 6,019,852 Pedziwatr et al addressed the shortcoming of interference of different frequency sound waves with an interspersed spacing a distance “D” between adjacent different frequency transducers."
"Multiple Frequency Technologies
There are two basic ways in which two or more ultrasonic frequencies are introduced into a single ultrasonic cleaning tank in modern day equipment. One is the relatively old method of supplying the different frequencies concurrently or in sequence from a number of transducers or transducer arrays each of which is designed to operate at a single frequency and has its own discreet generator. The second method is relatively new and utilizes a multiple frequency generator which drives universal transducers capable of operating at more than one frequency. The universal transducers produce ultrasound at each of the generator’s operating frequencies. The generator is programmed to supply different sweeping frequencies in succession to the single transducer array."
. . .
"The chronological history of concurrent multiple ultrasonic frequency equipment starts in 1959 with U.S. Pat. No. 2,891,176 in which Norman Branson teaches three transducer arrays driven by three generators where the operating periods of these generators overlap. In 1974 a tank was designed and built at Branson Cleaning Equipment Company that had an array of 25 kHz transducers on the bottom and a second array of 40 kHz transducers on one side; each of these arrays was simultaneously driven by the appropriate frequency generator. Similar systems were designed and built by others in the 1970's, e.g., Blackstone Ultrasonics, but no useful application was found for the technology. In 1981 U.K. Pat. No. 2,097,890A taught three transducer arrays driven by three generators on different phases of a three-phase line. In the mid 1990's Amerimade Technology sold a system consisting of a tank with angled walls and two arrays of transducers on different walls, each array was driven by a different frequency generator, one sweeping around 71.5 kHz and the other sweeping around 104 kHz. Also at that time, Zenith sold a two-array two-generator system operating at 80 kHz and 120 kHz called "crossfire" because the different frequencies intersected at 90 degrees."
. . .
"In U.S. Pat. No. 5,656,095 Honda, et al. teaches high frequency transducers and low frequency transducers on the tank where the high frequency transducers are normally driven and the low frequency transducers are driven for short periods of time to intermittently destroy the high frequency bubbles. In U.S. Pat. Nos. 5,865,199 and 6,019,852 Pedziwatr et al. teaches two arrays of transducers interspersed on the tank and driven by two different frequency generators. In U.S. Pat. No. 5,909,741 Ferrell teaches two arrays of transducers on different angled walls of a plastic container and driven by different frequency generators. In 2004 Crest Ultrasonics introduced a three-frequency product"
. . .
"In U.S. Pat. Nos. 5,865,199 and 6,019,852 Pedziwatr et al addressed the shortcoming of interference of different frequency sound waves with an interspersed spacing a distance “D” between adjacent different frequency transducers."
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