Determining the state of the surface of a moving body using eddy

Details Determining the state of the surface of a moving body using eddy Determining the state of the surface of a moving body using eddy

1982-02-23

1984-07-17

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

324226, 324227, 324233, 374176, G01R 3312, G01N 2772, G01K 736

Patent

active

044608691

ABSTRACT:
A method and apparatus for monitoring the state of the surface of a moving body wherein a four-terminal eddy-current coil circuit is connected in a feedback loop of an RC resonator. The eddy-current coil circuit is placed in proximity to the monitored surface of the moving body and connected in the feedback loop of an RC resonator such that a change in the state of the surface of the moving body results in a change in the conductivity thereof, which conductivity change produces a phase displacement changing the output frequency of the RC resonator. During operation, a first data set is obtained from the coil circuit and RC resonator presenting a first runout profile of the body when the monitored state is in an initial state. The first data set is stored in a memory, and a subsequent profile is derived to obtain a second data set indicative of the operational state of the surface of the moving body. The second data set is also stored in the memory and then the first data set is subtracted from the second data set to obtain an effective or true profile of the surface of the body at the subsequent operational time.

REFERENCES:
patent: 3681970 (1972-08-01), Wells
patent: 3699429 (1972-10-01), Ratz
patent: 3810002 (1974-05-01), Sata
patent: 3833850 (1974-09-01), Weber
patent: 3841149 (1974-10-01), Edwin et al.
patent: 3882305 (1975-05-01), Johnstone
patent: 3936734 (1976-02-01), Brandli et al.
patent: 3939404 (1976-02-01), Tait
patent: 4078201 (1978-03-01), Buser
patent: 4086527 (1978-04-01), Cadot
patent: 4112353 (1978-09-01), Thompson
patent: 4125943 (1978-11-01), Ando
patent: 4191921 (1980-03-01), Yoshino

Affiliated with

Also associated with

Rating

Determining the state of the surface of a moving body using eddy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Determining the state of the surface of a moving body using eddy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determining the state of the surface of a moving body using eddy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1493404