Patent US3707868A successfully refreshed from Google Patents.
US3707868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision pressure manometer
Assignee: MENSOR CORP
•
Filing: 1971-04-16
•
Granted: 1973-01-02
•
Expires: 1991-04-16
Abstract
Abstract A design Bourdon tube manometer, wherein tube deflection is detected by sensing the arc subtended by a light beam reflected from a mirror on the Bourdon tube, has a fixed light source and a null reading reflected beam detector. The Bourdon tube itself is mounted on a mounting member which is selectively movable with respect to a frame member on which is mounted the null reading detector. This permits linearizing the response of the instrument. Initially, the range of the instrument is adjusted by moving the mirror parallel to the source light beam to produce a read-out corresponding to the upper limit of the pressure range desired to be measured. Then the mirror is moved perpendicular to the source light beam to produce a linear response at a point at approximately the mid-point of such range.
Inventors
- 👤 J Fruit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0026; G01L9/0032
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
238 words
In a Bourdon tube manometer having a reflector means mounted on a Bourdon tube pressure gauge, a mirror deflection sensing means including a light source for directing a source beam of light spaced from said reflector means at said reflector means and a light sensor for detecting the arc subtended by the reflected beam from such reflecting means, and a readout means for producing a digital readout of pressure related to the arc subtended between said source beam and said reflected beam, the method of calibrating such a manometer for a substantially linear response over a preselected range which comprises: applying to such Bourdon tube pressure gauge a first reference pressure corresponding to the upper limit of such preselected range; detecting the arc subtended by the reflected beam from such reflector means as a result of application of such first reference pressure; moving said reflector means parallel to said source beam to change the size of the arc subtended by said reflected beam on said light sensor to produce an accurate readout of said first reference pressure; applying to said Bourdon tube pressure gauge a second reference pressure within said range wherein said readout differs substantially from said second reference pressure; and moving said reflector means transversely to the direction of said source beam while preserving the size of the arc subtended at said first readout pressure to produce an accurate readout corresponding to said second reference pressure.
Claim 2
Dependent Claim
238 words
In a Bourdon tube manometer having a reflector means mounted on a Bourdon tube pressure gauge, a mirror deflection sensing means including a light source for directing a source beam of light spaced from said reflector means at said reflector means and a light sensor for detecting the arc subtended by the reflected beam from such reflecting means, and a readout means for producing a digital readout of pressure related to the arc subtended between said source beam and said reflected beam, the method of calibrating such a manometer for a substantially linear response over a preselected range which comprises: applying to such Bourdon tube pressure gauge a first reference pressure corresponding to the upper limit of such preselected range; detecting the arc subtended by the reflected beam from such reflector means as a result of application of such first reference pressure; moving said reflector means parallel to said source beam to change the size of the arc subtended by said reflected beam on said light sensor to produce an accurate readout of said first reference pressure; applying to said Bourdon tube pressure gauge a second reference pressure within said range wherein said readout differs substantially from said second reference pressure; and moving said reflector means transversely to the direction of said source beam while preserving the size of the arc subtended at said first readout pressure to produce an accurate readout corresponding to said second reference pressure.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said second reference pressure is selected at a point within said preselected range wherein such reference pressure and the readout differ by the greatest amount.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said reference pressure is from 40-60 percent of said first reference pressure.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein said reflector means is moved in the direction parallel and transverse to said source beam by moving said Bourdon tube relative to the detecting portion of said mirror deflection sensing means.
Claim 6
Dependent Claim
20 words
The method of claim 1 including moving said light source with said reflector means to preserve the spaced relationship therebetween.
Claim 7
Dependent Claim
47 words
The method of claim 1 including the additional step of determining the region of greatest error of said readout within said range by applying a number successive incremental reference pressures within said range to said pressure gauge and recording the readout of each such incremental reference pressure.
Claim 8
Dependent Claim
264 words
In a measuring instrument having a transducer capable of producing a physical response functionally related in magnitude to the magnitude of the condition to be measured to produce a rotary deflection of a reflector means, and having sensing means including a light source spaced from said reflector means for directing a source beam of light at said reflector means, and a light sensor for detecting the arc subtended by the reflected beam from such reflector means, and a readout means for producing a digital readout of the condition to be measured related to the arc subtended between said source beam and said reflected beam, the method of calibrating such an instrument for a substantially linear response over a preselected range of values measuring said condition which comprises: applying to the transducer a first reference condition having a predetermined magnitude corresponding to the upper limit of such preselected range; detecting the arc subtended by the reflected beam from such reflector means as a result of application of such first reference condition; movIng said reflector means parallel to said source beam to change the size of the arc subtended by said reflected beam on said light sensor to produce an accurate readout corresponding to said first reference condition; applying to said transducer a second reference condition within said range wherein said readout differs substantially from said second reference condition; and moving said reflector means transversely to the direction of said source beam while preserving the size of the arc subtended at said first reference condition to produce an accurate readout corresponding to said second reference condition.
Claim 9
Dependent Claim
264 words
In a measuring instrument having a transducer capable of producing a physical response functionally related in magnitude to the magnitude of the condition to be measured to produce a rotary deflection of a reflector means, and having sensing means including a light source spaced from said reflector means for directing a source beam of light at said reflector means, and a light sensor for detecting the arc subtended by the reflected beam from such reflector means, and a readout means for producing a digital readout of the condition to be measured related to the arc subtended between said source beam and said reflected beam, the method of calibrating such an instrument for a substantially linear response over a preselected range of values measuring said condition which comprises: applying to the transducer a first reference condition having a predetermined magnitude corresponding to the upper limit of such preselected range; detecting the arc subtended by the reflected beam from such reflector means as a result of application of such first reference condition; movIng said reflector means parallel to said source beam to change the size of the arc subtended by said reflected beam on said light sensor to produce an accurate readout corresponding to said first reference condition; applying to said transducer a second reference condition within said range wherein said readout differs substantially from said second reference condition; and moving said reflector means transversely to the direction of said source beam while preserving the size of the arc subtended at said first reference condition to produce an accurate readout corresponding to said second reference condition.
Claim 10
Dependent Claim
31 words
The method of claim 7 wherein said second reference condition is selected at a point within said preselected range wherein such reference condition and the readout differ by the greatest amount.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein said reference condition is from 40-60 percent of said first reference condition.
References Cited (Backward Citations)
US3067617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |