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Title: Templated Micro-Channel Thermal Control System

 [1];  [1];  [1];  [1]
  1. Reactive Innovations, Westford, MA (United States)
Publication Date:
Research Org.:
Reactive Innovations, Westford, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Type / Phase:
Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

Kimble, Michael, Slote, Benjamin, Noble, Renee, and Salley, Edward. Templated Micro-Channel Thermal Control System. United States: N. p., 2017. Web.
Kimble, Michael, Slote, Benjamin, Noble, Renee, & Salley, Edward. Templated Micro-Channel Thermal Control System. United States.
Kimble, Michael, Slote, Benjamin, Noble, Renee, and Salley, Edward. Fri . "Templated Micro-Channel Thermal Control System". United States. doi:.
title = {Templated Micro-Channel Thermal Control System},
author = {Kimble, Michael and Slote, Benjamin and Noble, Renee and Salley, Edward},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2017},
month = {Fri May 05 00:00:00 EDT 2017}

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  • This work describes the design, simulation, fabrication and characterization of a microfabricated thermal conductivity detector to be used as an extension of the {micro}ChemLab{trademark}. The device geometry was optimized by simulating the heat transfer in the device, utilizing a boundary element algorithm. In particular it is shown that within microfabrication constraints, a micro-TCD optimized for sensitivity can be readily calculated. Two flow patterns were proposed and were subsequently fabricated into nine-promising geometries. The microfabricated detector consists of a slender metal film, supported by a suspended thin dielectric film over a pyramidal or trapezoidal silicon channel. It was demonstrated that themore » perpendicular flow, where the gas directly impinges on the membrane, creates a device that is 3 times more sensitive than the parallel flow, where the gas passed over the membrane. This resulted in validation of the functionality of a microfabricated TCD as a trace-level detector, utilizing low power. the detector shows a consistent linear response to concentration and they are easily able to detect 100-ppm levels of CO in He. Comparison of noise levels for this analysis indicates that sub part per million (ppm) levels are achievable with the selection of the right set of conditions for the detector to operate under. This detector was originally proposed as part of a high-speed detection system for the petrochemical gas industry. This system was to be utilized as a process monitor to detect reactor ''upset'' conditions before a run away condition could occur (faster than current full-scale monitoring systems were able to achieve). Further outlining of requirements indicated that the detection levels likely achievable with a TCD detector would not be sufficient to meet the process condition needs. Therefore the designed and fabricated detector was integrated into a detection system to showcase some technologies that could further the development of components for the current gas phase {micro}ChemLab as well as future modifications for process monitoring work such as: pressurized connections, gas sampling procedures, and packed columns. Component integration of a microfabricated planar pre-concentrator, gas-chromatograph column and TCD in the separation/detection of hydrocarbons, such as benzene, toluene and xylene (BTX) was also demonstrated with this system.« less
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  • A measuring system for the control of neutron flux in two decades and for the signalization of the preset flux level overshoot is described. The system consists of 3 identical measurement channeis operating on the principle two-out-of-three''. Component parts of the electronics equipment of the system, such as a d-c electrometer amplifier, trigger circuits of the power level to overcome signalization, and the circuits for signalization, of mismatch of the voltages at the outputs of 3 amplifiers, are described. Results of testing the main system parameters are given. (auth)