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Credentials of Dr. David Wadlow

letters: Ph.D., C.Sci., C.Phys., M.Inst.P., M.I.E.E.E.

President & Consultant, Sensors Research Consulting, Inc.

_______________________________________________ Dr. Wadlow is foremost an experimental physicist who via multiple research projects has grown to become an expert in several areas of sensor and measurement science. He started his career by joining a small research team in the engineering department at Reading University, UK, soon after completing his masters degree in experimental space physics at Leicester University, UK. This was in 1973. As the project's experimentalist and physicist Dr. Wadlow studied the electrogasdynamic interaction and later developed advances in the theory of the electric field charging process in dense solid aerosols. Incidental to that program Dr. Wadlow also invented a fiber-coupled, optoelectronic pickup for a small custom built turbine which could measure the flow of a very dense, high pressure, electrically charged aerosol. Subsequently, throughout his career Dr. Wadlow became increasingly involved directly in physical sensors and measurements until in 1981 he took on a project to develop a real-time multigas composition analyzer. Utilizing his knowledge in plasmas this led, in 1984, to the invention and commercial use of a novel emission based gas analyzer capable of continuously and rapidly measuring trace nitrogen in a three component gas mixture. This was also one of the earliest fully computerized gas analyzers and was used in the industrial gas industry. Later, he became the founding member of a research group to develop new biomedical instrumentation and sensors for a major US healthcare industry where he stayed until 1996. Currently he heads his own consulting firm and has been in business for over 5 years providing sensors R&D. Overall, he has acted as theorist, experimentalist, programmer, data analyst, learned-on-the-job engineer and designer in numerous research and engineering projects, all of which have entailed a variety of difficult experimental measurements or the development of a measurement technique, instrument or sensor. In the past 20 years this has continuously involved R&D project leadership. His last corporate project led to the invention and successful implementation of a high performance respiratory flow sensor for use in adult critical care. It is a thermal time of flight device. Dr. Wadlow later founded SRC and, as the company's president and sole employee, has obtained consulting contracts with a range of clients including one large corporation, several mid-size companies and entrepreneurs. In this latest role he has performed traditional consulting, performed consulting in virtual teamwork with clients and has structured and led small teams of subcontracted professionals to develop new sensors to the prototype stage under confidence, all for various applications and industries. Of the sensors developed by SRC, one in particular has the potential for being a disruptive technology. It is a new and proprietary motion sensitive proximity sensor.

Patents

D. Wadlow, Process and apparatus for analyzing a gaseous mixture and a visible emission spectrum generator therefor, U.S. Patent 4,801,209, 1989.

Issued patents related to the above:
D. Wadlow, South African Patent 87/0092, 1987.
D. Wadlow, European Patent EP 0 292 142 A2 (BE, DE, FR, GB, IT, NL), 1988.
D. Wadlow, Taiwan Patent UM44562, 1989.
D. Wadlow, Canadian Patent 1,264,382, 1990.
D. Wadlow, Australian Patent 588,959, 1990.

D. Wadlow, and L. M. Layden, Controlled flow volumetric flowmeter, U.S. Patent 5,284,053, 1994.

D. Wadlow, I. Scott, K. E. Draganovic, Flowmeter and method of using same, European Patent EP 0 773 432 A3, (DE, GB), 1998.

D. Wadlow, F. Scholten, R. Giffone, K. Gerenraich, Control system with capacitive detector, US Patent 6,731,209, 2004.

D. Wadlow, F. Scholten, R. Giffone, K. Gerenraich, Control system with capacitive detector, US Patent 6,995,670, 2006.

Publications

D. Wadlow and P. J. Musgrove, The performance of electrogasdynamic expanders with slightly conducting walls, Energy Conversion 15:127-135, 1976. (Also presented at the Intersociety Energy Conversion and Engineering Conference: San Francisco, 1974.)

P. J. Musgrove and D. Wadlow, Electrogasdynamic energy conversion using particulate charge carriers, Final report contract AFOSR-74-2647, Aerospace Res. Lab., Wright Patterson A.F.B.: Dayton, OH, 1975.

D. Wadlow and P. J. Musgrove, A study to consider the feasibility of large scale all electrogasdynamic energy conversion using a high temperature nuclear reactor source, Report under special contract to Central Electricity Generating Board, UK; Dept. Eng. & Cybernetics, Univ. Reading: Reading, UK, 1976.

D. Wadlow, Reading University pressurised EGD test facility, In Experimental investigation of electrogasdynamics, Final report on research agreement AT/2035/05, Procurement executive, Ministry of Defense: London, 1976.

D. Wadlow, Design of main gas cooler, Enthalpy meter design, In Electrogasdynamic Refrigeration, Report under grant no. ENG76-05035, NSF: Washington DC, 1977.

L. Layden and D. Wadlow, High velocity carbon dioxide snow for cleaning vacuum system surfaces, J.Vac.Sci.Technol. A, 8, (5): 3881-3, 1990.

D.Wadlow, 200+ Internal Research Project Reports and Internal Publications, BOC Group Technical Center, (formerly Airco Central Research Labs.): Murray Hill, NJ, 1978-1996.

D. Wadlow, Chapter 28.4: Turbine and vane flowmeters, In J.G. Webster (ed.), The Measurement, Instrumentation and Sensors Handbook, Boca Raton, FL: CRC Press, Dec., 1998.

D. Wadlow, The role of risk in the design, evaluation and management of corporate R&D project portfolios for new products, http://www.sensors-research.com/risk_ppr.htm, Sensors Research Consulting, Inc, Basking Ridge, NJ, Aug., 1998.

D. Wadlow, Turbine Flowmeters, Part 1: Details of the basic axial turbine flowmeter, Sensors 16, (10): 16-18, 20, 22, 24, 26, 28, 30-32, 1999.

D. Wadlow, Turbine Flowmeters, Part 2: Designs and special cases, Sensors 16. (11): 16-20, 22, 24, 26, 28, 30, 32, 34, 36-37, 1999.

D. Wadlow, Chapter 9.4 Turbine and vane flowmeters, In J.G. Webster (ed.), Mechanical Variables Measurement: solids, fluid and thermal, Boca Raton, FL: CRC Press, 2000.

Invited editorial, Sensor Business Digest, 9 (10): 1-2, Oct., 2000.

Invention records, etc.

Electrohydrodynamic distillation column. (primarily intended for argon columns in air separation units)

Density compensated differential pressure flowmeter.

Dispersive attenuated total reflection spectrometer. (New infrared technique for liquids composition analysis using an unusually shaped, thick film IR 'crystal'. Intended for real-time IV drug analysis.)

Real-time, high pressure, low resolution mass spectrometer for multigas analysis in the low to 200 mass range. (Intended for respiratory gas analysis.)

Sensitive helium leak detection using a mass spectrometer with multiphoton helium ionization.

Thermal time-of-flight flowmeter.

Cylindrical platinum film conductors for high speed gas heaters and fast, sensitive temperature sensors.

Auxiliary sensory inputs during anesthesia for improving patient well-being.

Non contact body temperature measurement system for anesthetized patients.

Metabolics measurement systems. (Sensor systems for indirect closed circuit calorimetry for anesthetized patients in critical care and ventilated patients in intensive care at high oxygen levels.)

An automatic flow and composition sensors data synchronization system and method for total expired CO₂ and O₂ measurements on ventilated patients.

Major R&D projects

Real-time trace nitrogen analyzer. Inventor, project leader. (Visible emission from an RF driven plasma - 10 - 2000 PPM nitrogen in 4-20% argon/oxygen mixtures, reliable, low maintenance and calibration requirements.) Completed 1984.

Fiber optic dissolved blood oxygen sensor. Project leader for seminal studies and proof of principle. 1986. Gave rise to a major corporate research program.

Real-time high pressure mass spectrometer for multigas analysis. Inventor, project leader. (Closed plasma ion source, miniature ion lens and magnetic sector, mechanical vacuum.) Demonstrated 1989.

Cylindrical rotor turbine for gas flow measurement. Inventor, project leader. (Bi-directional, gas composition independent response, 100:1 dynamic range, 40 ms response, low pressure drop.) Completed 1991.

Thermal time of flight gas flowmeter using cross correlation. Inventor, project leader. (Gases, bi-directional, composition independent response, low pressure drop, expendable transducer, 200:1 dynamic range, 60 ms step response.) Completed 1996.

Motion sensitive, capacitive proximity sensor. Late stage SRC project.

IR based coating sensor for environmentally related automotive application. Completed SRC project.

Redesign and test data analysis of a two stage differential pressure flow sensor for a spirometer. Current SRC project.

Engineering development projects (major or sole contributor)

Development of a chemical process for generating production quantities of high purity carbon monoxide.

Liquefier/purifier design, construction and commissioning for commercial liquid neon production. 0.9 liquid liters per hour capacity.

Evaluation of water treatment alternative for air separation unit cooling towers.

Field evaluation of infrared imaging, line and spot temperature measurement technologies and applications in industrial gas plants and distribution centers, and large graphite electrode manufacturing processes.

PVC vacuum manifolds for liquefied gas trailer vacuum space evacuation.

Materials (metals, glasses, etc.) compatibility studies for cell components confining a low pressure plasma in oxygen, nitrogen and halogenated compound carrying gas mixtures.

Development of 25 micron diameter thin platinum coated optical fibers for fast, rugged gas heater and temperature sensing.

Technology evaluations

Fiber optic coupled infrared spectrometer for anesthetic gas mixtures. (US medical divisional project for corporate R&D funding.)

Extrinsic fiber optic sensors for pressure, oxygen, pH, and metal ions. (Survey of current technology for new corporate research in support of invasive medical devices business.)

Extrinsic fiber optic pressure sensing research in the UK using resonant microstructures. (Academic for UK medical catheter division funding.)

Silicon micromachining capabilities for new micro and integrated sensors. (Review for corporate R&D participation.)

Fetal monitoring. Evaluation of FHR techniques. Analysis of the statistics relating outcomes to the probability of false positives and instrument accuracy. (Technology review for corporate R&D participation and potential new area of business for medical systems division.)

In-situ plasma generated atomic oxygen for medical device sterilization at packaging facilities. (potential ETO alternative.) (External startup company for potential acquisition by medical engineering division.)

Gas flow sensing technologies for moderate to high flows. Respiratory flow applications. (Technology review for support of anesthesia machine and related equipment business needs.)

Laser-based aerosol particle size discrimination based on signal variability and scattering angle. (Technology evaluation for technology transfer.)

Capacitive pressure sensors designed for improved immunity to mechanical shock and vibration as well as temperature variations. (Technology evaluation for technology transfer)

Novel fluidic flowmeter and a liquid density measurement system designed for monitoring hydraulic fluid. (Technology evaluation for technology transfer)

High temperature displacement sensor for monitoring the LEC process for GaAs and InP manufacture. (Technology evaluation for technology transfer)

Capacitive proximity sensor for non-contact activation of an antibacterial soap dispenser. (Technology and patent application review for commercial development.)

In-mold impedance sensor for rubber vulcanization process control. (Review of an advanced design.)

Feasibility study for a miniature flow sensor for an entrepreneurial medical application.

Academic Research Projects

Electrogasdynamic energy conversion. University of Reading. (Investigated for potential large scale direct conversion of heat to electricity.)

Electrogasdynamic cryogenic refrigeration. Cryogenics Center, Stevens Institute of Technology.

Professional affiliations and awards

Member Institute of Physics, (UK).

Member ISA, The Instrumentation, Systems and Automation Society

Member IEEE

Chartered Scientist, CSci, (Science Council, UK)

Chartered Physicist, CPhys, (IOP, UK)

Consulting affiliations

Teltech / Sopheon / Intota / Guideline - Technical Staff Expert

The CECON Group Science and Engineering Consulting Network

Senior Member IEEE Consultants' Network of Northern NJ

Active referee for the Journal of Electrostatics

Professional positions

1998 President, founder and consultant, Sensors Research Consulting, Inc. Basking Ridge, NJ. SRC is a scientific consulting firm specializing in physical sensors and physical measurements. SRC also provides corporate new product project portfolio design and analysis. This highly specialized consulting service is based on a new statistical technique developed by Dr. Wadlow called research risk strategy analysis.

1992-1996 Principal Investigator, Biomedical Instrumentation Group, BOC Group Technical Center,(formerly Airco Central Res.Labs.) Murray Hill, NJ. BOC Group, Inc. comprises BOC Gases, Ohmeda (recently sold), Edwards High Vacuum, BOC Coatings (formerly Airco Coatings), BOC Edwards Calumatic.

1988 Lead Engineer, Biomedical Instrumentation Group, BOC Group Technical Center.

1985 Senior Engineer, Biomedical Instrumentation Group, (inception), BOC Group Technical Center.

1981 Senior Engineer, Cardiovascular activities, Airco Central Research Labs., Murray Hill, NJ.

1978 Senior Engineer, Cryogenic Engineering Group, Airco Central Research Labs.

1976-78 Research Associate, Cryogenics Center, Stevens Institute of Technology, Hoboken, NJ.

1974-76 Research Associate, Department of Applied Physical Sciences (currently Dept. Engineering), University of Reading, UK.

1973 Assistant Experimental Officer, Department of Applied Physical Sciences, University of Reading, UK.

Education

Ph.D. University of Reading, UK, 1984. Thesis: Electrogasdynamic Energy Conversion.

M.Sc. University of Leicester, UK, 1972. Experimental Space Physics. 1^st in class.

B.Sc. University of Manchester, UK, 1971. Physics.