Accession Number : AD0525836

Title :   Bioluminescent Explosive Detector.

Descriptive Note : Final rept.

Corporate Author : RESOURCES PLANNING AND CONTROL CORP EL SEGUNDO CALIF

Report Date : 25 MAY 1973

Pagination or Media Count : 183

Abstract : The utilization of the bioluminescence concept for the detection of buried military explosives was advanced closer to realistic field application. The sensitivities of the biosensors were enhanced by mutagenesis, optimization of biosensor environment, and nutritional evaluations. An estimate of current sensor/equipment sensitivity ranges below 30 ppb to pure TNT (at saturated vapor pressure, 20 C). Based on experimental data, it was shown that the biosensors do possess some degree of specificity, especially with the TNT detection signals. Some of the common impurities found in TNT (i.e., DNT) and Composition B which elicited sensor responses resembling explosive detection curves are not expected to be found in the normal environment. Potential interferents such as nitrogen dioxide, sulfur dioxide, human effluents, etc., did not cause false positive reactions. A dual-channel photosensing unit was developed and fabricated to facilitate the acquisition of more detailed information on biosensor performance. Circuitry was developed which increased system signal-to-noise ratio and sensor pattern reproducibility. System detection capability was extended to accept dimmer sensor luminosities.

Descriptors :   (*EXPLOSIVES, DETECTION), (*LUMINESCENCE, *GAS DETECTORS), CIRCUITS, SENSITIVITY, INTERFERENCE, VAPORS, IMPURITIES, MARINE BIOLOGY, DIRECT CURRENT, VOLTAGE, TNT, DESIGN (U) *BACTERIA, NITROGEN OXIDES, SULFUR COMPOUNDS, FUNGI, VIBRIO, *PHOTODIODES, PHOTOSENSITIVITY, MUTATIONS, NUTRITION, CULTURE MEDIA, METABOLISM, BUFFERS, FREEZE DRYING, STORAGE, MOISTURE, GAS FLOW, LIGHT TRANSMISSION, PHOTOMULTIPLIER TUBES, PATTERN RECOGNITION, IDENTIFICATION, MULTIPATH TRANSMISSION

Subject Categories : Optical Detection and Detectors
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE