Measuring and testing – Gas analysis – By vibration
Patent
1993-04-05
1994-11-22
Williams, Hezron E.
Measuring and testing
Gas analysis
By vibration
73 6453, 73517AV, 73505, 2503384, 25037014, 310313R, 310313D, 324244, 324260, G01P 1508, H03H 930
Patent
active
053657705
ABSTRACT:
An acoustic or ultrasonic device includes two ultrasonic energy transmission paths having substantially identical transmission characteristics for a neutral condition of the device. One or both of the transmission paths include path altering structure(s) or coating(s) for changing the transmission characteristics of one or both of the paths in response to a physical phenomenon to be sensed or monitored. The paths have input transducers coupled thereto for transmitting ultrasonic energy into the paths. The input transducers are driven by a single oscillator such that the ultrasonic energy waves generated in the two paths are substantially identical to one another. A drive adjusting circuit compensates for any differences between the two paths and/or the ultrasonic waves in the two paths. An output transducer is coupled to the two paths for receiving ultrasonic waves from the paths and generating an output signal which is the result of combining the acoustic or ultrasonic waves from the two paths. By combining the waves from the two paths, the output signal is effectively the interference pattern generated by the waves in the two paths and hence the device operates as an acoustic or ultrasonic energy interferometer to sense or monitor physical phenomena to which the path altering structure(s) or coating(s) respond.
REFERENCES:
patent: 3680008 (1972-07-01), Yamamoto
patent: 3810257 (1974-05-01), Jones et al.
patent: 3878477 (1975-04-01), Dias et al.
patent: 3967221 (1976-06-01), Cooper et al.
patent: 4055072 (1977-10-01), Fletcher et al.
patent: 4130813 (1978-12-01), Sandy et al.
patent: 4209759 (1980-06-01), Volluet
patent: 4268808 (1981-05-01), Meengailis
patent: 4306456 (1981-12-01), Maerfeld
patent: 4341998 (1982-07-01), Castera et al.
patent: 4349794 (1982-09-01), Kagiuada et al.
patent: 4361026 (1982-11-01), Muller et al.
patent: 4447754 (1984-05-01), Wagers
patent: 4467235 (1984-08-01), De Wames et al.
patent: 4594889 (1986-06-01), McCarthy
patent: 4598224 (1986-07-01), Ballato
patent: 4598587 (1986-07-01), Dwyer et al.
patent: 4932255 (1990-06-01), Brace et al.
patent: 5011818 (1991-04-01), Katoka et al.
patent: 5173667 (1992-12-01), Meitzler
Martin et al, "Sensing in Liquids with SH Plate Mold Devices", 1988 Ultrasonics Symposium Proceedings, vol. 1, pp. 607-611.
-LIGA-, "Movable Microstructures", Institut fur Mikro-otuktuitechnik, Karesruhe, Germany, pp. 1-12.
Nieuwenhuizen et al, "Surface Acoustic Wave Chemical Sensors", Sensors and Materials, 5 (1989), pp. 261-300.
Meitzler Allen H.
Sickafus Edward N.
Abolins Peter
Finley Rose M.
Ford Motor Company
May Roger L.
Williams Hezron E.
LandOfFree
Ultrasonic wave interferometers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ultrasonic wave interferometers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrasonic wave interferometers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1983409