Cooled, temperature controlled electrometer (USH0001095)
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Del.icio.us| IP.com Number | IPCOM000001090D |
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| Dated | Aug 4, 1992 UTC | ||
| Size | 7 page(s) (0.81 MB) | ||
| Disclosed by |
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Publication Summary
A cooled, temperature controlled electrometer for the measurement of small currents. The device employs a thermal transfer system to remove heat from the electrometer circuit and its environment and dissipate it to the external environment by means of a heat sink. The operation of the thermal transfer system is governed by a temperature regulation circuit which activates the thermal transfer system when the temperature of the electrometer circuit and its environment exceeds a level previously inputted to the external variable temperature control circuit. The variable temperature control circuit functions as subpart of the temperature control circuit. To provide temperature stability and uniformity, the electrometer circuit is enclosed by an insulated housing.| Country | United States |
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| Language | English (United States) |
| Related Person(s) |
(ATTORNEY) Albrecht, John M. (ATTORNEY) Smith, Bradley W. (ATTORNEY) Moser, William R. (INVENTOR) Morgan, John P. (OWNER) The United States of America as represented by the United States |
| Related Document(s) |
(PATENT) USH001095
(PATENT) US02709753 (PATENT) US04370615 (PATENT) US04883957 (PATAPP) US697044 |
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United States Patent |
USH0001095 |
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Morgan |
August 4, 1992 |
Cooled, temperature controlled electrometer
Abstract
A cooled, temperature controlled electrometer for the measurement of small currents. The device employs a thermal transfer system to remove heat from the electrometer circuit and its environment and dissipate it to the external environment by means of a heat sink. The operation of the thermal transfer system is governed by a temperature regulation circuit which activates the thermal transfer system when the temperature of the electrometer circuit and its environment exceeds a level previously inputted to the external variable temperature control circuit. The variable temperature control circuit functions as subpart of the temperature control circuit. To provide temperature stability and uniformity, the electrometer circuit is enclosed by an insulated housing.
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Inventors: |
Morgan; John P. (Idaho Falls, ID) |
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Assignee: |
The United States of America as represented by the United States (Washington, DC) |
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Appl. No.: |
697044 |
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Filed: |
May 8, 1991 |
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Current U.S. Class: |
324/452; 250/283; 324/72; 324/458 |
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Intern'l Class: |
G01N 027/60; G01R 031/02 |
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Field of Search: |
324/452,454-458,72,72.5,105 250/281-283 |
References Cited
U.S. Patent Documents
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2709753 |
May., 1955 |
Krasnow et al. |
324/105. |
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4370615 |
Jan., 1983 |
Whistler et al. |
324/457. |
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4883957 |
Nov., 1989 |
Kinge et al. |
250/281. |
Primary Examiner: Gregory; Bernarr E.
Attorney, Agent or Firm: Albrecht; John M., Smith; Bradley W., Moser;
William R.
Goverment Interests
CONTRACTUAL ORIGIN OF THE INVENTION
The United States Government has rights in this invention pursuant to Contract
No. DE-AC07-84-ID-12435 between the U.S. Department of Energy and Westinghouse
Electric Corporation.
Claims
The embodiments of the invention in which an exclusive property or privilege is
claimed are defined as follows:
1. An electrometer system for the purpose of measuring small currents at
temperatures less than ambient room temperature including an electrometer
amplifier coupled to a high impedance to form an electrometer circuit, said
system further comprising:
a thermal transfer system coupled to said electrometer circuit;
means for receiving a signal from an external source;
means for transmitting a signal from the electrometer circuit;
means for thermally coupling said electrometer circuit to said thermal transfer
system where said thermal transfer system acts to cool said circuit by
transferring heat from the electrometer circuit and its environment to an
external environment;
means for regulating said thermal transfer system where said regulating means
controls the temperature of said electrometer circuit by controlling the
operation of said thermal transfer system; and
means for thermally insulating said electrometer circuit where said insulating
means inhibits the transfer of heat to the electrometer circuit while
increasing the stability of the temperature variation to which the electromete...