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Open Path Detection of Hazardous Gases. Open path, non-contact chemical detection Multiple chemicals detected and identified by a single detector Rapid.

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Presentation on theme: "Open Path Detection of Hazardous Gases. Open path, non-contact chemical detection Multiple chemicals detected and identified by a single detector Rapid."— Presentation transcript:

1 Open Path Detection of Hazardous Gases

2 Open path, non-contact chemical detection Multiple chemicals detected and identified by a single detector Rapid detection and identification (<1 sec) Sensitive, specific, reliable and robust Low maintenance and low cost of ownership 5/5/2015Avir Sensors Proprietary2 Technology Overview

3 ChemSight™ Architecture 5/5/2015Avir Sensors Proprietary3 Based on infrared spectrometry operating in the cm -1 (fingerprint region) cm -1 spectral ranges

4 5/5/2015Avir Sensors Proprietary4 IR spectrum absorption curve is parsed into 16 segments Each of the 16 segments is “zeroed out” to create a “background” Chemicals passing through the line of sight absorb known frequencies of IR. The ChemSight accurately detects and identifies the signature across a wide range of concentrations.

5 5/5/2015Avir Sensors Proprietary5

6 Open Path, Non-contact Chemical Detection Large coverage area No contact required for detection and identification and, consequently, no sensor poisoning Stand off detector does not require predicting potential release areas Applicable to inaccessible locations Designated a Department of Homeland Security SAFETY Act Qualified Anti-terrorism Technology (QATT) 5/5/2015Avir Sensors Proprietary6

7 Patented ChemVECTOR™ algorithm recognizes and identifies chemical’s infrared signatures in one second Detection and identification confirmed over user-defined intervals (30 seconds typical) Large on-board database of chemical signatures User configurable alert and alarm actions Easily operated by untrained personnel 5/5/2015Avir Sensors Proprietary7 Instant Alert and Identification

8 Selected Hazardous Gases Toxic Industrial ChemicalsChemical Warfare AgentsIndustrial Materials Ammonia Chloroethane Diborane Ethylene Oxide Formaldehyde Hydrogen Bromide Hydrogen Chloride Hydrogen Cyanide Hydrogen Sulfide Phosgene Vinyl Chloride Propylene Carbonyl Sulfide Acrylonitrile And many more AC (Hydrogen Cyanide) CG (Phosgene) GA (Tabun) GB (Sarin) GD (Soman) GF (Cyclo-Sarin) L (Lewisite) SA (Arsine) VX Aqueous ammonia cleaner IsoClean Stainless steel cleaner Propane Butane Natural gas Carbon Dioxide DMMP DIMP Methyl Salicylate FM-200 (Heptaflouropropane) Sulfur Hexaflouride Various alcohols and solvents Diesel and Gasoline exhaust 5/5/2015Avir Sensors Proprietary8

9 Patented ChemVECTOR™ detection and identification algorithm allows: Chemical detection and identification well below IDLH Detection of high and low chemical concentrations Rejection of background interferants while maintaining trace level sensitivity Full system verification using on-board confidence tester Sealed to IP66 standards for continuous operation in harsh environments Less than 20 watts power consumption 5/5/2015Avir Sensors Proprietary9 Sensitive, Specific, Reliable, and Robust

10 5/5/2015Avir Sensors Proprietary10 Path Integrated Concentrations

11 Representative Sensitivities (Over 100 meter path) ChemicalIDLHDetectIdentifyDetectIdentify Ammonia Ethylene Oxide Hydrogen Chloride Hydrogen Cyanide Phosgene Vinyl Chloride < /5/2015Avir Sensors Proprietary11 1 Second30 Seconds All units in ppm

12 Receiver Operating Characteristic (ROC) Curves ROC curves describe the likelihood of correct dichotomous decisions a patient has a disease / does not have a disease an anomaly has been detected / has not been detected a chemical is present / not present 5/5/2015Avir Sensors Proprietary12 true positive rate: TP/(TP+FN) {probability of identification} false-positive rate: FP/(TN+FP){probability of false-identification}

13 Illustrative ROC Curves 5/5/2015Avir Sensors Proprietary True Positive rate CT brain lesions: AUC 97% mammography: AUC 78-91% diabetes: AUC 81% polygraph: AUC 55-75% Polygraph (police) Diabetes screening Mammography screening CT brain lesions False Positive rate

14 5/5/2015Avir Sensors Proprietary14 75 ppm·m ammonia, 1 sec average ChemSight™ ROC Curves

15 5/5/2015Avir Sensors Proprietary15 75 ppm·m ammonia, 30 sec average ChemSight™ ROC Curves

16 Low Maintenance, Low Ownership Cost No consumables No ongoing calibration required Detector is monitored for blockage, dirt accumulation and other fault diagnosis Interfaces with standard security software systems New chemical signatures added to database via software On-board, full system confidence tester activated at user defined intervals 5/5/2015Avir Sensors Proprietary16

17 Perimeter protection HVAC systems Railway platforms Ports Airports Stadiums Chemical manufacturing and storage facilities Manufacturing facilities Environmental monitoring Schools 5/5/2015Avir Sensors Proprietary17 Typical Applications

18 5/5/2015Avir Sensors Proprietary18 BenefitsReturn on Investment Large area coverageLow cost per area covered One detector indentifies multiple chemicalsLow cost per chemical sensed Few sensors required No scheduled maintenanceLow ownership cost On-board, full system confidence tester Untrained Operators Integration with existing control systemsLow integration costs No specialized software required Software updatableAdd latest chemical threats Modify alert levels or alarms remotely Long-term data storageForensics Monitor against long-term threats (ramp-up) Return on Investment

19 Designated a Department of Homeland Security SAFETY Act Qualified Anti-terrorism Technology (QATT) Metro Rail Industrial Installations Carbonated beverage manufacturing Defense Logistics Agency Institutional Ventilation 5/5/2015Avir Sensors Proprietary19 Reference Supporters Army/Edgewood Research Office of Naval Research Private Entities Technical Support Working Group (TSWG) and DHS/DOS University of Virginia Virginia Center for Innovative Technology Technology Heritage

20 Mahalanobis Distance Technique 5/5/2015Avir Sensors Proprietary20

21 The Mahalanobis Distance is a mathematical tool that is part of ChemVECTOR™, a patented detection and identification algorithm unique to the ChemSight™. When a hazardous gas or interferant crosses the IR beam, ChemVECTOR™ determines: the mathematical magnitude relative to ambient air for detection the mathematical proximity to signatures in the chemical database for identification 5/5/2015Avir Sensors Proprietary21 Prasanta Chandra Mahalanobis Mahalanobis Distance

22 5/5/2015Avir Sensors Proprietary22 Ammonia at 70°F/30% RH, 30 sec averaging Mahalanobis Distance Plot

23 The MD-based mathematics in ChemVECTOR™ allow reliable detection and identification when over a wide range of concentrations even in the presence of a heavy load of interferants. Unlike alternative algorithms (e.g., principal component analysis - PCA), ChemVECTOR™ allows chemical signatures to be added to the signature database in any combination without recalculating the entire database. Detection and identification thresholds can be adjusted by ChemVECTOR™. 5/5/2015Avir Sensors Proprietary23 Uniqueness of ChemVECTOR™

24 Physical and Software Schematics 5/5/2015Avir Sensors Proprietary24

25 ChemSight™ Detection and Identification Detection Detection occurs when a new signal significantly exceeds background noise level. A mathematical threshold is set to create an acceptable level of false alarms. This threshold defines sensitivity. Identification Identification occurs when a new signal matches a signature in the library. For positive identification, the match needs to be within a mathematically determined threshold by ChemVECTOR™. When positive detection occurs but the signal is outside the identification threshold the ChemVECTOR™ issues an “Unknown” message. 5/5/2015Avir Sensors Proprietary25

26 5/5/2015Avir Sensors Proprietary26 Internal Layout of ChemSight™ 3) Band pass filters parse spectrum and send signals for processing 2) Rotating Mirror concentrates light on detector array 1) IR Light Enters Detector ChemSight™ Optical Layout

27 7.0” 5/5/2015Avir Sensors Proprietary27 7.5” 22.5” ChemSight™ Detector Dimensions

28 ChemSight™ Source Dimensions 5/5/2015Avir Sensors Proprietary28 14” 8”


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