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SpectraSensors Proprietary Information [ 1 ] Water Vapor Sensing System (WVSS-II) Bryce Ford Nov 9, 2011 Tunable Diode Laser Technology supporting AMDAR.

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Presentation on theme: "SpectraSensors Proprietary Information [ 1 ] Water Vapor Sensing System (WVSS-II) Bryce Ford Nov 9, 2011 Tunable Diode Laser Technology supporting AMDAR."— Presentation transcript:

1 SpectraSensors Proprietary Information [ 1 ] Water Vapor Sensing System (WVSS-II) Bryce Ford Nov 9, 2011 Tunable Diode Laser Technology supporting AMDAR Water Vapor Observation Applications

2 Brief History of Tunable Diode Laser (TDL) Spectroscopy  TDL was developed and refined by NASA at Caltech’s Jet Propulsion Lab over a 20 year period  Original systems developed and flown on aircraft and weather balloons for Atmospheric Research  The technology achieved space flight qualification and was launched on the 1999 Mars Polar Lander Spacecraft  Today TDL technology is considered mature and reliable and is in use for many applications  Basic TDL Absorption Spectroscopy (TDLAS) concept: Gas Sample Mirror Laser Detector Window Optical Sample Cell Concentration =(How much light is absorbed (energy) thru the sample cell) (Absorption Coefficient for a species) x (its path length)

3 WVSS-II Developed to Support AMDAR  Water Vapor Sensing System, WVSS-II, uses TDLAS to continuously measure atmospheric Water Vapor concentrations during flight  WVSS-II was specifically developed to support the needs for an AMDAR Water Vapor sensor, with the high reliability and low maintenance requirement for use in commercial aviation  It has undergone significant Engineering testing and Scientific evaluation over the last 7 years to arrive at the current configuration  Unique SpectraSensors design features provide very stable operation over long periods of time with no regular maintenance  The SpectraSensors technology is not effected by contaminants that impact many other TDL implementations

4 WVSS-II Primary Components  The Primary Components of WVSS-II –System Electronics Box (SEB –Air Sampler (UCAR Patented) –Inlet and Outlet hoses –Power and Data Communications System Electronics Box (SEB) Standard Aircraft Power/Data Connector Air Sampler Hoses DB-26 for RS-232 Data Output in Research and Test Configurations

5 Typical Installation – Internal View  Typical Interior Installation Configuration for WVSS-II SEB FWD Inlet Hose, Heated Outlet Hose, Non-Heated Aircraft Skin Air Sampler Inside view of Air Sampler SEB Hoses

6 Typical Installation – External View  External View of Air Sampler Installation Expanded View of the Air Sampler Air Sampler Installation on a

7 Interior of WVSS–II SEB  Interior view of the WVSS-II SEB Spectrometer Optical Cell Main Processor Board Note: There are no user maintainable items inside the SEB

8 Optics Of The WVSS Analyzer  Spectrometer Optical Cell Inside the SEB Optical Cell Laser Mirror Laser BeamDetector Hose Connections

9 WVSS-II Air Flow  Diagram of Air Flow through the WVSS-II Sample Cell Inside SEB      

10 Aircraft Operation and Maintenance of WVSS-II  Operation of the WVSS-II is 100% Automatic –No adjustments or settings necessary by airline partners –Data is transmitted from the SEB to the ACMU continuously when system is in operation –Transmission of data via ACARS is independent of WVSS-II operation  No Routine Maintenance Necessary –No consumable components to be exchanged –Sensor maintains calibration for at least 2 years  Air Flow Through the System is Critical –Any obstructions to air flow can be cleared with simple procedures –For aircraft that are on the ground for long periods, it is best to cover the inlet/outlet to avoid nesting by bugs  Long Term Maintenance at Regular Aircraft Heavy Check –Suggested functional/calibration check of SEB every 2 or 3 years at SSI

11 WVSS-II Performance Characteristics  WVSS-II Performance Characteristics MethodologyTunable Diode Laser Absorption Spectroscopy Response time/data output Internal Sample Rate: 4 Times/sec Real-time Output Rate: Every 2 sec - Water Vapor Concentration - Internal Pressure - Internal Temperature - Engineering data - System Status Data Downlink rate determined by ACARS (ARINC 429) Range of coverageSurface to approx 45,000 ft (13.7 km) Minimum detectable signal< 50 ppmv ( g/kg) [1] [1] Maximum detectable signal60,000 ppmv (37.32 g/kg) [2] [2] Accuracy (% of signal) ±50 ppmv or ±5% of reading, whichever is greater Minimum absorbance (Output resolution)1 x g/Kg (~2 ppmv) Analyzer Optical Path length22.7 cm (8.938 in) Model Number of Revision [1] [1] Conversion of Minimum detectable signal from ppmv to g/kg is computed for 200 mb and -57˚ C, a representative atmospheric condition at approximately 40,000 ft Flight Level [2] [2] Conversion of Maximum detectable signal from ppmv to g/kg is computed for 1016 mb and 36˚ C, a representative atmospheric condition at the Surface

12 Environmental and Power Requirements Outside air temperature range for operation -65˚C to +50˚C SEB inside operating temperature range-5˚C to +30˚C SEB storage temperature range-40˚C to +85˚C Sample Gas Pressure RangeSurface (1016 mb) to 200 mb SEB Operating pressure range14.7 PSI ± 10 PSI Input voltage28 VDC standard aircraft power Current5 amp 28 VDC Minimum Operating Voltage (any temperature) 17 VDC Drop out Voltage (any temperature)15.8 VDC Maximum Operating Voltage (any temperature) 33 VDC  Environmental Range (SEB = System Electronics Box)  Power Requirements

13 Physical Specifications Size mm (10.00”) long x mm (5.44”) wide x 92.08mm (3.625”) high Weight 3.43 kg (7.56 lb) Outputs (Standard Mode) ARINC 429 via ACARS Outputs (Research and Test Modes) RS-232 output direct to PC applications Mounting 6 x Screws Thermal Isolation from airframe required. Replacement interval At the convenience of the air carrier Size mm (5.37”) long x 80.89mm (3.185”) wide x 19.98mm (0.787”) high Mounting Flush-mounted on outside skin of aircraft Replacement interval None required unless visible evidence of damage (20 year lifetime)  Physical Specs; System Electronics Box  Physical Specs; External Air Sampler * * The Aerial Sampler Patents, U.S. Patent No.s 6,809,648 and 6,997,050, were developed by the University Corporation for Atmospheric Research. The University Corporation for Atmospheric Research Foundation has licensed the Aerial Sampler Technology to SpectraSensors Inc. 3 Mounting Screws – Each End

14 Relevant U.S. FAA Certifications U.S. FAA Supplemental Type Certifications (STC) for: - B PF - B U.S. FAA Supplemental Type Certifications (STC) in Progress for: - B (Planned completion Dec 2011) U.S. FAA Supplemental Type Certifications (STC) Being Evaluated for: - B (Estimated completion Jun 2012) Compliant to all environmental conditions specified by FAA Document Number RTCA/DO-160E dated December 9, 2004  WVSS-II Product Certifications ISO 9001: 2008 U.S. FAA PMA for existing STCs U.S. FAA Certified Repair Station for WVSS-II  SpectraSensors Manufacturing and Engineering Facilities Certifications

15 SpectraSensors Locations Atmospheric Programs Bethesda, MD (Washington DC Metro Area) Corp Headquarters Houston, TX Production and Engineering Development Rancho Cucamonga, CA Small Business ~80 Employees, with 35 Engineers and Scientists

16 WVSS-II Production at SpectraSensors  SpectraSensors is FAA Certified for Production and Repair of WVSS-II

17 Examples of Soundings from WVSS-II Equipped Aircraft  Use of WVSS-II Data by Meteorological Operations is no different than traditional sounding data, once processed into standard format

18 Status of US NWS WVSS-II Network as of September 2011 UPS: 25 SWA: 29 * Data and Visualization courtesy of NOAA ESRL/GSD Total: 54  24 Hours of WVSS-II Date from the U.S. NWS Network from 54 Aircraft

19 Global Implementation Status  WVSS-II Units in Operation by WMO Member NMHS WMO Region# In Operation # Delivered or Ordered But Not Yet Installed I - Africa II - Asia III – So America IV – No America5438 V - So West Pacific VI - Europe3 (Rev 2) 10  WVSS-II Units in Operation by Other Users Region# In Operation # Delivered or Ordered But Not Yet Installed Africa Asia So America No America So West Pacific Europe11

20 Potential Future Opportunities  Potential Expansion to other New Sensors if there is Sufficient Market Demand –Extending Water Vapor Measurements to Lower Concentrations –Other Greenhouse Gases Future Opportunities

21 Starting with Moisture and Moving to Other Greenhouse Gas Measurements Other Greenhouse Gas Measurement Measurement  Other Greenhouse Gas Measurements can be taken using similar technologies  Requires Different Lasers, Electronics, Measurement Cell, and additional Aircraft Certifications  Can be addressed when Market Demand is Verified Moisture Measurement Water Vapor Water Carbon Dioxide Hydrogen Sulfide Nitrous Oxide N2ON2ON2ON2O Methane CH 4 Sulfur Hexafluoride SF 6 Ozone O3O3O3O3 Atmospheric Water Vapor (H 2 0)  Drives Much of Our Weather  Source of Our Precipitation  Is a Major Contributor to the Greenhouse Effect  WVSS-II Verified in Operation

22 Thank You! Thank You GraciasObrigado Bryce L. Ford Vice President of Atmospheric Programs Mobile: SpectraSensors, Inc Rosedale Ave Suite #720 Bethesda, MD


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