Patent US4385835A successfully refreshed from Google Patents.
US4385835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating device
Assignee: Micronic AB
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Filing: 1981-03-27
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Granted: 1983-05-31
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Expires: 2001-03-27
Abstract
Abstract A compensating device in combination with a laser interferometer, which laser interferometer comprises a laser (1), a prism (6) rigidly connected to a movable object, a beam splitter prism (2) and a stationary prism (3). The wavelength of the laser light is subject to changes by external factors, for example meteorologic ones. The compensating device includes mechanism (4,5) capable to change the position of the stationary prism (3) in response to and by means of an electric signal, which represents the desired compensation for magnitudes affecting the accuracy of the laser interferometer.
Inventors
- 👤 Gerhard Westerberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:40
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/02055; G01B9/02062; G01B9/02067
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
A compensating device in a laser interferometer, used for example for range measurement, the laser interferometer comprising a laser (1), a prism (6) rigidly connected to a movable object, a beam splitter prism (2) and a stationary prism (3), characterized in that said compensating device is rigidly connected to the interferometer stationary prism (3) and comprises means (4,5) capable of and for changing the position of said stationary prism (3) in a direction towards and away from the beam splitter prism in response to and by means of an electric signal transmitted to said compensating device from a unit (19) designed to sense at least a condition which influences the wave length of the laser light and thereby affects the accuracy of the laser interferometer, whereby said electrical signal to said compensating device represents the desired control input to said compensating device to provide desired movement of said stationary prism to provide compensation within the interferometer for said condition.
Claim 2
Dependent Claim
159 words
A compensating device in a laser interferometer, used for example for range measurement, the laser interferometer comprising a laser (1), a prism (6) rigidly connected to a movable object, a beam splitter prism (2) and a stationary prism (3), characterized in that said compensating device is rigidly connected to the interferometer stationary prism (3) and comprises means (4,5) capable of and for changing the position of said stationary prism (3) in a direction towards and away from the beam splitter prism in response to and by means of an electric signal transmitted to said compensating device from a unit (19) designed to sense at least a condition which influences the wave length of the laser light and thereby affects the accuracy of the laser interferometer, whereby said electrical signal to said compensating device represents the desired control input to said compensating device to provide desired movement of said stationary prism to provide compensation within the interferometer for said condition.
Claim 3
Dependent Claim
84 words
A compensating device in a laser interferometer as defined in claim 1, characterized in that said means comprises a resilient elongate armature (4) means firmly clamp one end (4a) of said armature which is free at its other end (4b), an electromagnet (5) adjacent and mounted to impart electromagnetic force on said free end (4b), said stationary prism (3) is attached to said armature (4), and circuitry including said electromagnet (5) is adapted to be supplied with the electric signal from said unit (19).
Claim 4
Dependent Claim
65 words
A compensating device as defined in claim 1 or 2, intended to compensate for variations in the wavelength of the laser light due to changes in meteorologic conditions, characterized in that the unit (19) is capable of processing and generating said electric signal correlated to the effect of the atmospheric pressure, temperature and air humidity on the wavelength of the laser light in the interferometer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |