Analog drive for ultrasonic probe with tunable phase angle

Details Analog drive for ultrasonic probe with tunable phase angle Analog drive for ultrasonic probe with tunable phase angle

1989-10-20

1990-11-13

Black, Thomas G.

Boots, shoes, and leggings

364484, 323208, 323211, 310316, 318116, 331 36R, 73589, 73648, H03L 700

Patent

active

049706560

ABSTRACT:
The system uses a tunable inductor in series with the piezoelectric crystal excitation transducer in the probe which has a flux modulation coil. The bias current through this flux modulation coil is controlled by the system. It is controlled such that the inductance of the tunable inductor cancels out the capacitive reactance of the load impedance presented by the probe when the probe is being driven by a driving signal which matches the mechanical resonance frequency of the probe. The resulting overall load impedance is substantially purely resistive. The system measures the phase angle and monitors the power level. The system uses this information to adjust the bias current flowing through the flux modulation coil to maintain the substantially purely resistive load impedance for changing power levels. This information is also used to adjust the frequency of the driving signal to track changing mechanical resonance conditions for the probe at different power levels. This method of operation insures substantially maximum power transfer efficiency and substantially linear power control over a range of power dissipation levels. There is also disclosed an analog circuit to measure the phase angle for the load driving signal and to adjust the frequency of the driving signal for best performance. This system includes an integrator to eliminate the effect of offset errors caused by operational amplifiers. There is also disclosed a system to determine the mechanical resonance frequency by sweeping the drive frequency and monitoring the drive current for the frequency at which the drive current is a maximum.

REFERENCES:
patent: 2752512 (1956-06-01), Sarratt
patent: 2799787 (1957-07-01), Guttner
patent: 2872578 (1959-02-01), Kaplan et al.
patent: 2917691 (1959-12-01), De Prisco et al.
patent: 3139577 (1960-08-01), Krezek
patent: 3152295 (1964-10-01), Schebler
patent: 3223907 (1965-12-01), Blok et al.
patent: 3263124 (1966-07-01), French et al.
patent: 3296511 (1967-01-01), Van Der Burgt et al.
patent: 3365657 (1968-01-01), Webb
patent: 3379972 (1968-04-01), Foster et al.
patent: 3422343 (1968-11-01), Specht
patent: 3432691 (1969-03-01), Shoh
patent: 3443130 (1969-05-01), Shoh
patent: 3524085 (1970-08-01), Shoh
patent: 3936727 (1976-02-01), Kelley, Jr. et al.
patent: 3946280 (1976-03-01), Quist
patent: 3955134 (1976-05-01), Woodford
patent: 3963798 (1976-06-01), Kelley, Jr. et al.
patent: 3963978 (1976-06-01), Kelly, Jr. et al.
patent: 3968432 (1976-07-01), Kelley, Jr.
patent: 3992661 (1976-11-01), Kelley, Jr.
patent: 4013937 (1977-03-01), Pelly
patent: 4028614 (1977-06-01), Kelly, Jr.
patent: 4127805 (1978-11-01), Lukoshov
patent: 4134302 (1979-01-01), Matay
patent: 4227110 (1980-10-01), Douglas et al.
patent: 4271371 (1981-06-01), Furuichi et al.
patent: 4271705 (1981-06-01), Crostack
patent: 4277758 (1981-07-01), Mishiro
patent: 4310891 (1982-01-01), Niki
patent: 4312044 (1982-01-01), Baba
patent: 4344328 (1982-08-01), Hawkins
patent: 4365301 (1982-12-01), Arnold et al.
patent: 4371816 (1983-02-01), Wieser
patent: 4385208 (1983-05-01), Tow
patent: 4395762 (1983-07-01), Wondergem
patent: 4409659 (1983-10-01), Devine
patent: 4445063 (1984-04-01), Smith
patent: 4445082 (1984-04-01), Roberge
patent: 4450082 (1984-04-01), Bolduc
patent: 4503380 (1985-03-01), Thanawala
patent: 4525790 (1985-06-01), Nakamura
patent: 4551690 (1985-11-01), Quist
patent: 4583529 (1986-04-01), Briggs
patent: 4590416 (1986-05-01), Porche
patent: 4597388 (1986-07-01), Koziol et al.
patent: 4599553 (1986-07-01), Brennan
patent: 4605890 (1986-08-01), Ogle
patent: 4623838 (1986-11-01), Nakamura
patent: 4626728 (1986-12-01), Flachenecker et al.
Chmielnik et al., Klin. Oczna (1981) 83:307-309.
Clayman, Australian J. Ophthalmol. (1984) 12:71-77.
Chinese J. Ophthalmol. (1979) 15(3):135-137.
Chinese J. Ophthalmol. (1981) 17(1):29-31.
Heslin et al., J. Amer. Intraoccul. Implant Soc., (Fall, 1983) 9(4):445-449.
Coopervision Ultrasonic Decoupling Sleeve Brochure Article (pub. available May 1986) per article.

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