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Title: Integrating preconcentrator heat controller

Abstract

A method and apparatus for controlling the electric resistance heating of a metallic chemical preconcentrator screen, for example, used in portable trace explosives detectors. The length of the heating time-period is automatically adjusted to compensate for any changes in the voltage driving the heating current across the screen, for example, due to gradual discharge or aging of a battery. The total deposited energy in the screen is proportional to the integral over time of the square of the voltage drop across the screen. Since the net temperature rise, .DELTA.T.sub.s, of the screen, from beginning to end of the heating pulse, is proportional to the total amount of heat energy deposited in the screen during the heating pulse, then this integral can be calculated in real-time and used to terminate the heating current when a pre-set target value has been reached; thereby providing a consistent and reliable screen temperature rise, .DELTA.T.sub.s, from pulse-to-pulse.

Inventors:
 [1];  [2];  [1]
  1. Albuquerque, NM
  2. Edgewood, NM
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
918891
Patent Number(s):
7282676
Application Number:
11/341,764
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
F - MECHANICAL ENGINEERING F41 - WEAPONS F41H - ARMOUR
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Bouchier, Francis A, Arakaki, Lester H, and Varley, Eric S. Integrating preconcentrator heat controller. United States: N. p., 2007. Web.
Bouchier, Francis A, Arakaki, Lester H, & Varley, Eric S. Integrating preconcentrator heat controller. United States.
Bouchier, Francis A, Arakaki, Lester H, and Varley, Eric S. Tue . "Integrating preconcentrator heat controller". United States. https://www.osti.gov/servlets/purl/918891.
@article{osti_918891,
title = {Integrating preconcentrator heat controller},
author = {Bouchier, Francis A and Arakaki, Lester H and Varley, Eric S},
abstractNote = {A method and apparatus for controlling the electric resistance heating of a metallic chemical preconcentrator screen, for example, used in portable trace explosives detectors. The length of the heating time-period is automatically adjusted to compensate for any changes in the voltage driving the heating current across the screen, for example, due to gradual discharge or aging of a battery. The total deposited energy in the screen is proportional to the integral over time of the square of the voltage drop across the screen. Since the net temperature rise, .DELTA.T.sub.s, of the screen, from beginning to end of the heating pulse, is proportional to the total amount of heat energy deposited in the screen during the heating pulse, then this integral can be calculated in real-time and used to terminate the heating current when a pre-set target value has been reached; thereby providing a consistent and reliable screen temperature rise, .DELTA.T.sub.s, from pulse-to-pulse.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {10}
}

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