Patent US3757126A successfully refreshed from Google Patents.
US3757126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input stage amplifier gain and balance method of setting moire fringe transducer reading head skew angle and
Assignee: Warner and Swasey Co
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Filing: 1972-08-28
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Granted: 1973-09-04
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Expires: 1992-08-28
Abstract
Abstract A method of setting the reading head skew angle and the associated input stage amplifier gain and balance of a Moire fringe transducer system is disclosed which can be carried out with a voltmeter. The procedure involves setting the signal d-c level at zero by means of an amplifier balance potentiometer, measuring the a-c output of the input stage amplifier associated with each channel while adjusting the reading head skew angle to obtain a maximum signal, resetting the d-c level at zero, setting the a-c amplitude at the prescribed level by adjusting the amplifier gain and then measuring and setting the phase angle between square waves produced from the 0* and 90* channel sine waves by measuring the effective a-c value produced by the combined 0* and 90* square waves and adjusting the reading head skew angle to obtain a predetermined a-c reading corresponding to the correct phase angle, and then repeating the procedures involved in the last three steps until all of the conditions are met.
Inventors
- 👤 G Tumbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:49
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
252 words
A method of setting the skew angle of a Moire fringe transducer system reading head which reading head includes a series of photocells, each adapted to produce a cyclically varying electrical signal in response to movement of a fringe pattern relative thereto, and which transducer system includes amplifier means receiving each of said signals, and including adjustable balance means for setting the d-c level of amplifier means output signals generated from said varying electrical signals received from the transducer at zero and also including adjustable gain means for setting the amplitude of said signals at a predetermined level, the method including the steps of: adjusting the balance of the amplifier means to obtain a zero dc level of the amplifier means output signal generated from one of said varying electrical signals; adjusting the reading head skew angle to obtain a maximum a-c signal value from said amplifier means output; adjusting the balance of the amplifier means To obtain a zero dc level of the amplifier means output signals generated from each of said varying electrical signals; adjusting the amplifier means gain to obtain a predetermined amplitude of each of said amplifier means output signals; again adjusting the reading head skew angle and measuring the ac value produced by combining two of the amplifier means output signals until an a-c value is produced corresponding to the correct phase angle between said two amplifier means output signals; repeating the last three steps as required until all of the signal conditions met therein are attained.
Claim 2
Independent Claim
252 words
A method of setting the skew angle of a Moire fringe transducer system reading head which reading head includes a series of photocells, each adapted to produce a cyclically varying electrical signal in response to movement of a fringe pattern relative thereto, and which transducer system includes amplifier means receiving each of said signals, and including adjustable balance means for setting the d-c level of amplifier means output signals generated from said varying electrical signals received from the transducer at zero and also including adjustable gain means for setting the amplitude of said signals at a predetermined level, the method including the steps of: adjusting the balance of the amplifier means to obtain a zero dc level of the amplifier means output signal generated from one of said varying electrical signals; adjusting the reading head skew angle to obtain a maximum a-c signal value from said amplifier means output; adjusting the balance of the amplifier means To obtain a zero dc level of the amplifier means output signals generated from each of said varying electrical signals; adjusting the amplifier means gain to obtain a predetermined amplitude of each of said amplifier means output signals; again adjusting the reading head skew angle and measuring the ac value produced by combining two of the amplifier means output signals until an a-c value is produced corresponding to the correct phase angle between said two amplifier means output signals; repeating the last three steps as required until all of the signal conditions met therein are attained.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein in again adjusting said reading head skew angle step, said amplifier means output signals are first squared before measuring the a-c value produced by combining said two of said amplifier means output signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |