Cryostat for borehole sonde employing semiconductor detector

Patent · Tue Dec 30 04:00:00 EST 1980

OSTI ID:6530354

Tapphorn, R M

In the specific embodiments of the invention disclosed, a semiconductor radiation detector located in a logging tool sized for passage through a borehole is maintained at cryogenic temperatures by a cryostat housed in the tool. The cryostat includes a cryogen chamber containing a melting-solid type cryogen. Thermal insulation in the form of radiation heat shields and a vacuum chamber surround the cryogen chamber. The integrity of the vacuum insulation is maintained by an active vacuum pump. The pump may be mounted either externally of the cryostat, such that its operation is independent of temperature conditions within the cryostat, or internally thereof, so as to be cooled by the cryogen. Alternatively, a second cryostat may be provided to cool the pump.

• Assignee: Schlumberger Technology Corp
• Patent Number(s): US 4241592
• OSTI ID: 6530354
• Country of Publication: United States
• Language: English

Related Subjects

420201 -- Engineering-- Cryogenic Equipment & Devices
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOREHOLES
CAVITIES
CONTROL
CONTROL EQUIPMENT
CRYOSTATS
DESIGN
EQUIPMENT
LABORATORY EQUIPMENT
MEASURING INSTRUMENTS
PUMPS
RADIATION DETECTORS
SEMICONDUCTOR DETECTORS
TEMPERATURE CONTROL
THERMAL INSULATION
THERMOSTATS
VACUUM PUMPS
WELL LOGGING EQUIPMENT