Patent US4375033A successfully refreshed from Google Patents.
US4375033A
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Universal detector for atomic and molecular beams
Assignee: AT&T Inc
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Filing: 1981-03-09
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Granted: 1983-02-22
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Expires: 2001-03-09
Abstract
Abstract An atomic or molecular beam detector is disclosed wherein the beam to be detected is coupled through a chopper to form a spatially modulated beam which is then directed at the pressure sensitive surface of a small sensitive microphone. The electrical output signal of this microphone is coupled to a phase-sensitive detector in order to detect the energy that is present in the signal at the frequency corresponding to the chopping rate. In the specific embodiment disclosed, a light beam is also coupled through the chopper in order to develop a second electrical signal which is mixed with the electrical output of the microphone and then coupled through a low pass filter to provide a DC signal when the atomic or molecular beam is present.
Inventors
- 👤 John E. Bjorkholm
- 👤 Jonathan C. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:48
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
Apparatus for detecting the presence of an atomic or molecular beam comprising chopper means for interrupting said atomic or molecular beam at a predetermined rate in order to produce a spatially modulated beam, microphone means having an electrical output and a pressure-sensitive surface that is oriented to receive said spatially modulated beam, means for detecting the presence of energy in said electrical output at a frequency corresponding to said predetermined rate.
Claim 2
Dependent Claim
71 words
Apparatus for detecting the presence of an atomic or molecular beam comprising chopper means for interrupting said atomic or molecular beam at a predetermined rate in order to produce a spatially modulated beam, microphone means having an electrical output and a pressure-sensitive surface that is oriented to receive said spatially modulated beam, means for detecting the presence of energy in said electrical output at a frequency corresponding to said predetermined rate.
Claim 3
Dependent Claim
25 words
Apparatus for detecting the presence of an atomic or molecular beam as defined in claim 1 wherein said microphone means includes an electret-condenser type microphone.
Claim 4
Dependent Claim
101 words
Apparatus as defined in claim 1 wherein said means for detecting includes mixer means having two inputs and an output, one of said two input of said mixer means being connected to receive said electrical output, a light source oriented so as to couple its output light beam to said chopper means, thereby creating a chopped light beam, a light-sensitive detector means oriented to receive said chopped light beam for developing a signal corresponding to said predetermined rate, and means for connecting the signal from said light-sensitive detector means to a second one of said two inputs of said mixer means.
Claim 5
Dependent Claim
83 words
A particle beam detector comprising means for chopping said particle beam at a predetermined rate to produce a spatially modulated particle beam, microphone means having a pressure-sensitive surface that is oriented to intercept said spatially modulated particle beam to produce an electrical output signal at a frequency corresponding to said predetermined rate when a particle beam is present, means for detecting energy present in said electrical output signal at said frequency to provide a visual indication of the presence of said particle beam.
Claim 6
Dependent Claim
83 words
A particle beam detector comprising means for chopping said particle beam at a predetermined rate to produce a spatially modulated particle beam, microphone means having a pressure-sensitive surface that is oriented to intercept said spatially modulated particle beam to produce an electrical output signal at a frequency corresponding to said predetermined rate when a particle beam is present, means for detecting energy present in said electrical output signal at said frequency to provide a visual indication of the presence of said particle beam.
Claim 7
Dependent Claim
18 words
A particle beam detector as defined in claim 4 wherein said microphone means includes an electret-condenser type microphone.
Claim 8
Dependent Claim
106 words
A particle beam detector as defined in claim 4 wherein said means for detecting includes a mixer means having two inputs and an output, one of said two inputs of said mixer means being connected to receive said electrical output signal, a light source oriented so as to couple its output light beam to said means for chopping thereby creating a chopped light beam, a light-sensitive detector means oriented to receive said chopped light beam for developing a signal corresponding to said predetermined rate, and means for connecting the signal from said light-sensitive detector to a second one of said two inputs of said mixer means.
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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |