4/10/2020
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
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4/10/2020
Based on infrared spectrometry operating in the 830-1250 cm -1
(fingerprint region) 2000-3300 cm -1 spectral ranges
Avir Sensors Proprietary 3

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.
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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)
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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
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Toxic Industrial Chemicals
• Ammonia
• Chloroethane
• Diborane
• Ethylene Oxide
• Formaldehyde
• Hydrogen Bromide
• Hydrogen Chloride
• Hydrogen Cyanide
• Hydrogen Sulfide
• Phosgene
• Vinyl Chloride
• Propylene
• Carbonyl Sulfide
• Acrylonitrile
• And many more
Chemical Warfare Agents
• AC (Hydrogen Cyanide)
• CG (Phosgene)
• GA (Tabun)
• GB (Sarin)
• GD (Soman)
• GF (Cyclo-Sarin)
• L (Lewisite)
• SA (Arsine)
• VX
Industrial Materials
• 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
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Sensitive, Specific, Reliable, and Robust
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
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(Over 100 meter path)
All units in ppm
Chemical
Ammonia
Ethylene Oxide
Hydrogen Chloride
Hydrogen Cyanide
Phosgene
Vinyl Chloride
IDLH
300
800
50
50
2
450
Detect
0.8
0.5
4.6
4.3
0.17
1.0
1 Second
Identify
1.0
2.0
4.8
5.0
0.25
12
Detect
0.3
30 Seconds
Identify
0.3
0.2
4.4
2.3
0.12
<1.0
0.5
4.5
2.8
0.2
8.0
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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 true positive rate: TP/(TP+FN) false-positive rate: FP/(TN+FP)
{probability of identification}
{probability of false-identification}
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1.0
CT brain lesions
Mammography screening
0.5
Diabetes screening
Polygraph
(police)
0 False Positive rate
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0.5
Avir Sensors Proprietary
CT brain lesions: AUC 97%
mammography: AUC 78-91%
diabetes: AUC 81%
polygraph: AUC 55-75%
1.0
13

75 ppm·m ammonia, 1 sec average
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75 ppm·m ammonia, 30 sec average
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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
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Perimeter protection
HVAC systems
Railway platforms
Ports
Airports
Stadiums
Chemical manufacturing and storage facilities
Manufacturing facilities
Environmental monitoring
Schools
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Benefits
Large area coverage
One detector indentifies multiple chemicals
No scheduled maintenance
Integration with existing control systems
Software updatable
Long-term data storage
Return on Investment
Low cost per area covered
Low cost per chemical sensed
Few sensors required
Low ownership cost
On-board, full system confidence tester
Untrained Operators
Low integration costs
No specialized software required
Add latest chemical threats
Modify alert levels or alarms remotely
Forensics
Monitor against long-term threats (ramp-up)
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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
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
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Mahalanobis Distance Technique
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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
Prasanta Chandra Mahalanobis
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Ammonia at 70 ° F/30% RH, 30 sec averaging
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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™.
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Physical and Software Schematics
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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.
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3) Band pass filters parse spectrum and send signals for processing
1) IR Light Enters
Detector
2) Rotating Mirror concentrates light on detector array
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Internal Layout of ChemSight™
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7.0”
7.5”
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22.5”
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14”
14”
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8”
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