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UV-B DETECTOR BASED UPON RYDBERG STATES

Award Information

Agency:
Department of Agriculture
Branch:
N/A
Award ID:
20942
Program Year/Program:
1993 / SBIR
Agency Tracking Number:
20942
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
ATOM SCIENCES, INC.
ATOM SCIENCES, INC. 114 RIDGEWAY CTR OAK RIDGE, TN 37830 8810
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1993
Title: UV-B DETECTOR BASED UPON RYDBERG STATES
Agency: USDA
Contract: N/A
Award Amount: $49,981.00
 

Abstract:

THE THREAT OF OZONE DEPLETION CAUSING INCREASED ULTRAVIOLET RADIATION AT MID-LATITUDES ON THE EARTH'S SURFACE, AND THE RESULTING HARM TO PLANT AND ANIMAL LIFE, HAVE PROMOTED THE U.S. DEPARTMENT OF AGRICULTURE TO ESTABLISH AN IMPROVED UV IRRADIANCE MONITORING PROGRAM, WITH EMPHASIS ON THE UV-B SPECTRAL REGION BETWEEN 290 NM AND 320NM. HOWEVER, THERE IS CONCERN OVER THE LONG-TERM STABILITY OF INSTRUMENTS USED TO MEASURE THE UV-B FLUX. THIS PROPOSAL DESCRIBES A DETECTOR THAT HAS AN INTRINSIC ABSOLUTE WAVELENGTH CALIBRATION AT ALL TIMES. THE DEVICE IS BASED UPON UV-B EXCITATION OF VAPOR-PHASE ATOMS. HIGH-ENERGY STATES (RYDBERG STATES) OF CERTAIN ALKALI METAL ATOMS ARE PRODUCED BY RESONANCE ABSORPTION F WAVELENGTH IN THE UV-B. THESE EXCITED-STATE ATOMS CAN BE IONIZED BY AN ELECTRIC FIELD AND THE RESULTING ELETRONS DETECTED IN AN MULTIPLIER. EACH RYDBERG STATE HAS A UNIQUE VOLTAGE THRESHOLD AND CAN BE IDENTIFIED BY THE VOLTAGE AT WHICH IONIZATIN OCCURS. THEREFORE, THE IONIZATION SIGNAL AT A PARTICULAR VOLTAGE IS PROPORTIONAL TO THE PHOTON FLUX AT THE (KNOWN) RESONANCE EXCITATION WAVELENGTH OF THE CORRESPONDING RYDBERG STATE. THE INSTRUMENT IS INSENSITIVE TO GAIN CHANGES BECAUSE PHOTON COUNTING IS USED.

Principal Investigator:

Dr Tom J Whitaker
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Business Contact:

Small Business Information at Submission:

Atom Sciences Inc.
114 Ridgeway Center Oak Ridge, TN 37830

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No