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Author: raju datla
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1. Lunar Spectral Irradiance and radiance (LUSI): new instrumentation to characterize the Moon as a space-based radiometric standard
Series: Journal of Research (NIST JRES)
Report Number: 117.011
Published: 7/17/2012
Authors: Allan W. Smith, Steven Ray Lorentz, Raju Vsnu Datla, Thomas C. Stone
Abstract: The need to understand and monitor climate change has led to proposed radiometric accuracy requirements for space-based remote-sensing instruments that are very stringent and currently beyond the reach of many Earth orbiting instruments. A major ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903135

2. Workshop on Bridging Satellite Climate Data Gaps
Series: Journal of Research (NIST JRES)
Published: 2/16/2011
Authors: Catherine C Cooksey, Raju Vsnu Datla
Abstract: Detecting the small signals of climate change for the most essential climate variables requires that satellite sensors make highly accurate and consistent measurements. Data gaps in the time series (such as possible launch delay or failure) or incon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905860

3. Report on the NIST workshop of December 10, 2009: calibration strategies for bridging possible climate data gaps
Published: 8/12/2010
Authors: Raju Vsnu Datla, Joseph Paul Rice, Catherine C Cooksey, Kurtis J Thome, Robert Barnes, Changyong Cao
Abstract: A one day workshop was held on December 10, 2009 at the National Institute of Standards and Technology to address the issue of data gaps in the time series of satellite measurements. Such gaps can occur due to launch delay or failure, or inconsisten ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906283

4. Demonstration of a Meissner-Effect Transition Edge Sensor
Published: 7/26/2010
Authors: Solomon I Woods, Stephen M. Carr, Timothy M. Jung, Adriaan C. Carter, Raju Vsnu Datla
Abstract: We have built and tested a transition edge sensor which monitors temperature change by measuring magnetic flux expulsion from a superconducting element. Flux change is sensed by a dc SQUID coupled to the element using a flux transformer in a gradiom ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904199

5. Calibration of Ultra-Low Infrared Power at NIST
Published: 7/20/2010
Authors: Solomon I Woods, Stephen M. Carr, Adriaan C. Carter, Timothy M. Jung, Simon Grant Kaplan, Raju Vsnu Datla
Abstract: The Low Background Infrared (LBIR) facility has developed and tested the components of a new detector for calibration of infrared powers down to 1 pW, with 0.1% uncertainty. Calibration of such low powers could be valuable for the quantitative study ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906008

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905223

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905479

8. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=890001

9. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902518

10. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900204



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