scholarly journals High temperature electronics for geothermal well-logging applications. Proceedings of a workshop held at the University of Arizona, April 28, 1978

1978 ◽  
Author(s):  
L.S. Raymond
Keyword(s):  
High Temperature ◽  
Well Logging ◽  
Geothermal Well ◽  
High Temperature Electronics ◽  
University Of Arizona ◽  
The University

A 225C Geothermal Logging Tool

2016 ◽  
Vol 2016 (HiTEC) ◽  
pp. 000028-000034
Author(s):  
Marshall Soares ◽  
Randy Normann ◽  
Bruce Ohme
Keyword(s):  
Fluid Flow ◽  
High Temperature ◽  
Data Transmission ◽  
Flow Measurement ◽  
High Speed ◽  
Well Logging ◽  
Geothermal Well ◽  
High Temperature Operation ◽  
Logging Tool ◽  
Fluid Flow Measurement

Abstract Geothermal logging tools are difficult to develop due to sustained high temperature operation. Recent commercial component offerings are significantly altering the high temperature geothermal tool problem. This paper implements a new baseline geothermal tool circuit working with five 225C, SOI components. An example tool including up to four spinners (fluid flow measurement), four analog inputs (for pressure, temperature or other sensors), EEPROM storage (program and data), FSK logic (wireline data transmission), and a high-speed UART (tool communication). Field updates of code and calibration constants are supported. Further, this paper demonstrates how the tool electronics can be expanded for more complex applications such as a geothermal well logging camera.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

High-Temperature Electronics in Europe

2000 ◽  
Author(s):  
Vladimir Dmitriev ◽  
T. P. Chow ◽  
Steven P. DenBaars ◽  
Michael S. Shur ◽  
Michael G. Spencer
Keyword(s):  
High Temperature ◽  
High Temperature Electronics
Sign in / Sign up

Export Citation Format

Share Document