Thermoelectric cooled, purge-and-trap device for enhancing the utility of fiber optic VOC sensors

Conference · Sun Aug 01 04:00:00 EDT 1993

OSTI ID:10190179

Mizusawa, E A; Daley, P F; Kyle, K R; Langry, K C; Angel, S M

A thermoelectric cooled, purge-and trap device (TEC) has been developed to enhance the utility of fiber optic VOC sensors. This simple device consists of a thin copper radiator which is sandwiched between two thermoelectric coolers. Two water-cooled, copper heat sinks are used to maintain the hog side surfaces of the thermoelectric coolers at 5 degrees C, allowing internal surface temperatures of the radiator to be controlled between 5 degrees C to {minus}43 degrees C. This paper describes the use of the TEC with a reversible, fiber optic, carbon tetrachloride sensor. The sensor by itself has a detection limit of around 1,000 ppmv carbon tetrachloride in nitrogen. When the sensor is used with the TEC, vapor phase concentrations down to 100 ppmv can be measured.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10190179
• Report Number(s): UCRL-JC--115005; CONF-9309199--10; ON: DE94001772
• Country of Publication: United States
• Language: English

Related Subjects

440800
47 OTHER INSTRUMENTATION
54 ENVIRONMENTAL SCIENCES
540220
CARBON TETRACHLORIDE
CHEMICALS MONITORING AND TRANSPORT
DESIGN
DETECTION
FIBER OPTICS
GROUND WATER
MEASURING INSTRUMENTS
MISCELLANEOUS INSTRUMENTATION
OPTIMIZATION
ORGANIC COMPOUNDS
REMEDIAL ACTION
THERMOELECTRIC COOLERS
VOLATILE MATTER