US4643589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermometry employing gallium aluminum arsenide diode sensor
Assignee: Lake Shore Cryotronics Inc
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Filing: 1985-08-09
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Granted: 1987-02-17
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Expires: 2005-08-09
Abstract
Abstract A thermometer is described having a broad voltage-temperature characteristic rendering it useful in making temperature measurements from below 1 DEG K. to above 500 DEG K. The thermometer employs a gallium aluminum arsenide diode and displays improved sensitivity over more conventional diode devices. In addition to providing for improved polynomial fitting for calibration curve purposes, the diode also exhibits an advantageously low magnetic field dependence.
Inventors
- 👤 John K. Krause
- 👤 Bradley C. Dodrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:39
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/01
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
23 words
A thermometer temperature sensing element capable of sensing temperatures in the cryogenic range comprising a solid-state junction device formed of gallium aluminum arsenide.
Claim 2
Dependent Claim
23 words
A thermometer temperature sensing element capable of sensing temperatures in the cryogenic range comprising a solid-state junction device formed of gallium aluminum arsenide.
Claim 3
Dependent Claim
15 words
The sensing element of claim 1 wherein said solid-state junction device is a P-N diode.
Claim 4
Dependent Claim
22 words
The sensing element of claim 1 wherein said gallium aluminum arsenide exhibits a peak spectral emission wavelength of less than 920 nm.
Claim 5
Dependent Claim
19 words
The sensing element of claim 3 wherein said peak spectral emission wavelength is between about 600 and 900 nm.
Claim 6
Dependent Claim
19 words
The sensing element of claim 4 wherein said peak spectral emission wavelength is between about 800 and 900 nm.
Claim 7
Dependent Claim
53 words
A thermometer capable of measuring temperature in the cryogenic range comprising: a solid-state junction device formed of gallium aluminum arsenide; a source of select current; means for applying said source of current across said junction device; and means for determining the value of voltage drop across said device induced by said select current.
Claim 8
Dependent Claim
53 words
A thermometer capable of measuring temperature in the cryogenic range comprising: a solid-state junction device formed of gallium aluminum arsenide; a source of select current; means for applying said source of current across said junction device; and means for determining the value of voltage drop across said device induced by said select current.
Claim 9
Dependent Claim
14 words
The thermometer of claim 3 in which said junction device is a P-N diode.
Claim 10
Dependent Claim
22 words
The sensing element of claim 6 wherein said gallium aluminum arsenide exhibits a peak spectral emission wavelength of less than 920 nm.
Claim 11
Dependent Claim
19 words
The sensing element of claim 8 wherein said peak spectral emission wavelength is between about 600 and 900 nm.
Claim 12
Dependent Claim
19 words
The sensing element of claim 9 wherein said peak spectral emission wavelength is between about 800 and 900 nm.
Claim 13
Independent Claim
48 words
A method for determining the temperature of a given body comprising the steps of: providing a sensing element as a gallium aluminum arsenide diode; thermally associating said diode and said body in heat exchange relationship; applying constant current to said diode; and determining the resultant voltage drop thereacross.
Claim 14
Independent Claim
48 words
A method for determining the temperature of a given body comprising the steps of: providing a sensing element as a gallium aluminum arsenide diode; thermally associating said diode and said body in heat exchange relationship; applying constant current to said diode; and determining the resultant voltage drop thereacross.
Claim 15
Dependent Claim
12 words
The method of claim 11 wherein said diode is a P-N diode.
Claim 16
Dependent Claim
25 words
The method of claim 12 wherein said body is subject to a temperature of between about 500° K. and a temperature within the cryogenic range.
Claim 17
Dependent Claim
18 words
The method of claim 13 wherein said body is subject to a temperature of below about -110° C.
Claim 18
Dependent Claim
22 words
The sensing element of claim 11 wherein said gallium aluminum arsenide exhibits a peak spectral emission wavelength of less than 920 nm.
Claim 19
Dependent Claim
19 words
The sensing element of claim 15 wherein said peak spectral emission wavelength is between about 600 and 900 nm.
Claim 20
Dependent Claim
19 words
The sensing element of claim 16 wherein said peak spectral emission wavelength is between about 800 and 900 nm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |