US3828251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable microwave radiation sensing and measuring device
Assignee: General Electric Co
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Filing: 1973-10-23
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Granted: 1974-08-06
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Expires: 1993-10-23
Abstract
Abstract A portable device for sensing and measuring microwave energy includes an RF diode to sense the electric field of the microwaves and to convert it into direct current which is readily measured and indicated by a current meter. The device also includes a metal radiation shield interposed between the detector diode and the meter to insure that the current measured is due only to that microwave energy incident upon the diode. The diode is mounted within a radiation permeable protective casing which is shaped so as to locate the detector diode at a uniformly fixed distance and orientation with respect to the surface being measured for radiation leakage. The case may also be adapted to accept an elongated handle so that measurements may be made without placing the operator in the field of any possible leakage of radiation.
Inventors
- 👤 R Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:11
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6432; G; G01; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
A self-contained, portable, passive device for sensing and measuring the electric field strength of microwave radiation emanating from a surface under test, comprising: a semi-conductor diode serving both as a microwave sensing antenna and as a detector such that the diode is arranged to be inserted into the field of the radiation; circuit means operatively coupled to the diode for conducting an induced current proportional to the strength of the field into which the diode is inserted, the circuit means including indicator means responsive to the direct current for providing an indication of the strength of the field; a microwave-reflective radiation shield interposed between the diode and the circuit means for isolating the circuit means from the microwave field encountered by the diode; and a protective enclosure in which the diode, circuit means and shield are mounted, to form a unitary package, the enclosure having a radiation permeable extension encompassing the diode and being so formed as to provide a predetermined spacing and orientation of the diode from the test surface.
Claim 2
Dependent Claim
171 words
A self-contained, portable, passive device for sensing and measuring the electric field strength of microwave radiation emanating from a surface under test, comprising: a semi-conductor diode serving both as a microwave sensing antenna and as a detector such that the diode is arranged to be inserted into the field of the radiation; circuit means operatively coupled to the diode for conducting an induced current proportional to the strength of the field into which the diode is inserted, the circuit means including indicator means responsive to the direct current for providing an indication of the strength of the field; a microwave-reflective radiation shield interposed between the diode and the circuit means for isolating the circuit means from the microwave field encountered by the diode; and a protective enclosure in which the diode, circuit means and shield are mounted, to form a unitary package, the enclosure having a radiation permeable extension encompassing the diode and being so formed as to provide a predetermined spacing and orientation of the diode from the test surface.
Claim 3
Dependent Claim
48 words
The device of claim 1 in which the surface under test is the door seal junction of a microwave oven and the form of the enclosure extension provides a predetermined orientation of the diode relative to the door seal as the device is moved along the door seal.
Claim 4
Dependent Claim
267 words
A self-contained, portable, passive device for sensing and measuring the electric field strength of microwave radiation emanating from the door seal junction of a microwave oven, comprising: a semi-conductor RF diode serving both as a microwave sensing antenna and a detector such that the diode is arranged to be inserted into the field of the radiation; circuit means operatively coupled to the diode for conducting an induced direct current proportional to the strength of the field into which the RF diode is inserted, the circuit means including a current meter responsive to the induced current for providing an iNdication of the strength of the field, the circuit means further including a variable resistor to effect calibration of the device; a microwave-reflective radiation shield in the form of an electrically-conductive cup interposed between the diode and the circuit means to isolate the circuit means from the microwave field encountered by the diode; a protective enclosure in which the diode, circuit means and shield are mounted to form a unitary package, the enclosure having a radiation permeable extension encompassing the diode and being so formed as to have a length adapted to place the diode at a predetermined spacing from the microwave oven surface being measured for radiation leakage, the enclosure further having an elongated rib attached to the end thereof for maintaining a fixed orientation of the diode relative to the microwave oven door seal junction, and the enclosure being further adapted to accept an elongated handle for remotely holding the device so as not to expose the operator thereof to the field of any possible radiation leakage.
Claim 5
Dependent Claim
267 words
A self-contained, portable, passive device for sensing and measuring the electric field strength of microwave radiation emanating from the door seal junction of a microwave oven, comprising: a semi-conductor RF diode serving both as a microwave sensing antenna and a detector such that the diode is arranged to be inserted into the field of the radiation; circuit means operatively coupled to the diode for conducting an induced direct current proportional to the strength of the field into which the RF diode is inserted, the circuit means including a current meter responsive to the induced current for providing an iNdication of the strength of the field, the circuit means further including a variable resistor to effect calibration of the device; a microwave-reflective radiation shield in the form of an electrically-conductive cup interposed between the diode and the circuit means to isolate the circuit means from the microwave field encountered by the diode; a protective enclosure in which the diode, circuit means and shield are mounted to form a unitary package, the enclosure having a radiation permeable extension encompassing the diode and being so formed as to have a length adapted to place the diode at a predetermined spacing from the microwave oven surface being measured for radiation leakage, the enclosure further having an elongated rib attached to the end thereof for maintaining a fixed orientation of the diode relative to the microwave oven door seal junction, and the enclosure being further adapted to accept an elongated handle for remotely holding the device so as not to expose the operator thereof to the field of any possible radiation leakage.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |