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You searched on: Author: raju datla

Displaying records 11 to 20 of 104 records.
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11. Cryogenic Fourier transform spectrometer for infrared spectral calibrations from 4 to 20 micrometers
Published: 5/20/2010
Authors: Solomon I Woods, Simon Grant Kaplan, Timothy Michael Jung, Adriaan Carl Linus Carter, Raju Vsnu Datla
Abstract: We present initial performance data from a cryogenic Fourier transform spectrometer (Cryo-FTS) designed for low-background spectral infrared calibrations. The Cryo-FTS operates at a temperature of approximately 15 K and has been integrated into an in ...

12. Infrared Transfer Radiometer for Broadband and Spectral Calibration of Space Chambers
Published: 4/23/2010
Authors: Timothy M. Jung, Adriaan C. Carter, Solomon I Woods, Simon Grant Kaplan, Raju Vsnu Datla
Abstract: The Low-Background Infrared (LBIR) facility at NIST has recently completed construction of an infrared transfer radiometer with an integrated cryogenic Fourier transform spectrometer (Cryo-FTS). This mobile system can be deployed to customer sites f ...

13. Uncertainty Analysis of Remote Sensing Optical Sensor Data Guiding Principles to Achieve Metrological Consistency
Published: 2/20/2010
Authors: Raju Vsnu Datla, Ruediger Kessel, Allan W. Smith, Raghu N Kacker, D. B. Pollock
Abstract: Climate change monitoring requires long time series radiometric measurements using multiple optical sensors in multiple platforms covering the globe over decades. The problem of achieving traceability to SI units for these measurements is discussed. ...

14. Best Practice Guidelines for Pre-Launch Characterization and Calibration of Instruments for Passive Optical Remote Sensing
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7637
Published: 11/1/2009
Authors: Raju Vsnu Datla, Joseph Paul Rice, Keith R. Lykke, Bettye C Johnson, James J. Butler, Xiaoxiong Xiong
Abstract: The pre-launch characterization and calibration of remote sensing instruments should be planned and carried out in conjunction with their design and development to meet the mission requirements. In the case of infrared instruments, the onboard calibr ...

15. Absolute Cryogenic Radiometer and Solid State Trap Detectors for IR Power Scales Down to 1 pW with 0.1% Uncertainty
Published: 6/2/2009
Authors: Adriaan Carl Linus Carter, Solomon I Woods, Stephen Carr, Timothy Michael Jung, Raju Vsnu Datla
Abstract: Commercially available Absolute Cryogenic Radiometers (ACRs) have combined uncertainties that grow rapidly above 1% at power levels below 10 nW. There are solid state detectors, however, used in sensors and radiometers that cannot be calibrated at l ...

16. PicoWatt Infrared Power Measurement using an Absolute Cryogenic Radiometer
Published: 5/7/2009
Authors: Stephen Carr, Solomon I Woods, Timothy Michael Jung, Adriaan Carl Linus Carter, Raju Vsnu Datla
Abstract: We report on initial measurements of the low-temperature thermal properties of a device that is similar to the experimental apparatus used for absolute cryogenic radiometry (ACR) within the Low Background Infrared Radiometry (LBIR) facility at NIST. ...

17. Measurement science for climate remote sensing
Published: 8/20/2008
Authors: Gerald T Fraser, Steven W Brown, Raju Vsnu Datla, Bettye C Johnson, Keith R. Lykke, Joseph Paul Rice
Abstract: The Earth s climate is very complex and highly variable, making it difficult to measure and model small changes that occur over decadal and longer time scales. The resulting uncertainties in measurement and modeling underlie the longterm debate over ...

18. Infrared Absolute Calibrations Down to 10 fW in Low-Temperature Environments at NIST
Published: 7/22/2008
Authors: Adriaan Carl Linus Carter, Raju Vsnu Datla, Timothy Jung, Solomon Woods
Abstract: The Low Background Infrared (LBIR) facility at the National Institute of Standards and Technology (NIST) is responsible for absolute IR radiometric calibrations (SI traceable) in low-background temperature (below 80 K) environments. IR radiometric te ...

19. Intercomparison of the LBIR Absolute Cryogenic Radiometers to the NIST Optical Power Measurement Standard
Series: Journal of Research (NIST JRES)
Published: 8/1/2006
Authors: Adriaan Carl Linus Carter, James A Fedchak, Raju Vsnu Datla
Abstract: The Low Background Infrared (LBIR) facility at the National Institute of Standards and Technology (NIST) presently maintains four absolute cryogenic radiometers (ACRs) which serve as standard reference detectors for infrared calibrations performed by ...

20. Low Background Temperature Calibration of Infrared Blackbodies
Published: 3/23/2006
Authors: Adriaan Carl Linus Carter, Raju Vsnu Datla, Timothy Michael Jung, Allan W. Smith, James A Fedchak
Abstract: The Low Background Infrared (LBIR) facility at the National Institute of Standards and Technology (NIST) has performed 10 calibrations of low-background blackbodies since 2001 when the calibration facility and calibration method for low-background bl ...

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