Applicability of Portable Explosive Detection Devices in Transit Environments (2004) / Chapter Skim
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Pages 16-23
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From page 16... ...
16 CHAPTER 3 TEST PROCEDURES AND RESULTS 3.1 FIELD-OPERATIONAL TESTING Procedures were used in the preliminary field trials to test and evaluate the performance specifications, including the following: • Detection probability; • False alarm rate; • Throughput rate; and • Size, weight, and support requirements. The goal of the field evaluation was to measure the effectiveness of the EDD under normal conditions and to determine if it was suitable for the transit environment.
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agency escorts provided timely and knowledgeable information about topics such as typical bomb procedures, identification of test sites, provision of entry to secure areas, and possible deployment uses of portable EDDs. Work permits and/or badges were also provided to the test team to ensure access and safety.
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At the request of the hosting transit authority, the device was checked before each day of testing to ensure that the audio alarm was disabled, and only the visual alarm was enabled. This was to avoid alarming the commuters by having the device set off alarms throughout the system.
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An example of the data collection spreadsheet is included in Appendix C The data from the spreadsheet were entered into a test database for the test sites to be synthesized and analyzed.
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maintenance yards, above- and below-ground electric rail transit, diesel regional rail, parking facilities, subway turnstiles, escalators, tunnels, platforms, mezzanines, and streetlevel entries to the subway. Table 8 provides a summary of Test Site A results.
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using its last pair of latex gloves for this test and therefore was not able to follow standard procedure by changing gloves after each alarm. After purchasing new latex gloves, the test team returned to the same test location to perform another test to see if the false positives continued.
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at various locations -- platforms, street and mezzanine levels, as well as inside tunnel walkways within the system. None of the locations seemed to pose any environmental conditions that may have adversely challenged the device while testing.
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occurred while testing at the device's minimum sensitivity level of 10 ng. Five false positives were recorded, all at the same location.
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