Spectral radiance calibrations

Walker, James H.; Saunders, Robert D.; Hattenburg, Albert T.

doi:10.6028/nbs.sp.250-1

Cited by 54 publications

(46 citation statements)

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“…Similar to work in the ultraviolet, the 1000 W quartz tungsten halogen FEL lamp is the most common irradiance standard source. Historically, the spectral irradiance values of working standard FEL lamps at NIST were assigned using a chain of comparisons based on the spectral radiance of a blackbody at the freezing temperature of gold [36]. In 2000, the procedure was revised; now the spectral irradiance values of the working standard lamps are assigned by direct comparison to the spectral irradiance produced from a high temperature blackbody.…”

Section: The Radiometric Calibration Of Visiblmear Infrared/shortwavementioning

confidence: 99%

“…NIST issues modified commercial 30 W D2 lamps that are calibrated for spectral irradiance from 200 nm to 400 nm [34]. It is also possible to assign spectral radiance values to DZ lamps, and they have been used as transfer standards in international intercomparisons of spectral radiance [35].…”

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

“…The double coiled tungsten filament, enclosed by a quartz envelope and surrounded by a halogen-doped inert gas, results in a stable source with a relative spectral distribution equivalent to a blackbody at about 3000 K. The FEL lamp is the most common source used in radiance and irradiance calibrations of remote sensing instruments operating from 250 nm to 2500 nm); further discussion of this source can be found later in this chapter. For spectral radiance standards, gas-filled tungsten strip lamps are possible [36].…”

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

“…From 250 nm through 400 nm, NIST issues a 1000 W tungsten quartz halogen lamp (TQH), type FEL [36] as a standard of spectral irradiance. The double coiled tungsten filament, enclosed by a quartz envelope and surrounded by a halogen-doped inert gas, results in a stable source with a relative spectral distribution equivalent to a blackbody at about 3000 K. The FEL lamp is the most common source used in radiance and irradiance calibrations of remote sensing instruments operating from 250 nm to 2500 nm); further discussion of this source can be found later in this chapter.…”

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

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10. The Calibration and Characterization of Earth Remote Sensing and Environmental Monitoring Instruments

Butler

Johnson

Barnes

2005

Experimental Methods in the Physical Sciences

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Section: The Radiometric Calibration Of Visiblmear Infrared/shortwavementioning

confidence: 99%

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

Section: The Radiometric Calibration Of Uv Earth Remote Sensing Instrmentioning

confidence: 99%

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10. The Calibration and Characterization of Earth Remote Sensing and Environmental Monitoring Instruments

Butler

Johnson

Barnes

2005

Experimental Methods in the Physical Sciences

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“…The use of this stable lamp permits us to distinguish the effect of small lamp current changes on the spectral radiance. This lamp was calibrated for spectral radiance at a current of 7.600 A in the NIST Facility for Automated Spectroradiometric Calibrations (PASCAL) [5].…”

Section: Description Of Automated Currentmentioning

confidence: 99%

Improved automated current control for standard lamps

Walker¹,

Thompson²

1994

J. RES. NATL. INST. STAN.

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As radinmctric lamp ■ttandards improve, the need to set lamp current to specific values bccotncs more important. Commercially available power supplies typically provide 12 bit internal digiialto-analog logic which permits current control with a relative expanded uncertainty of about 1 part in 4096, corresponding to an expanded uncertiiinty of the current of about 2 mA at 8 A (in this paper, expimded uncertainties are given as 2 standard deviations). For an FEL-typc standard spectral irradiance lamp, this corresponds to a spectral irradiance difference of 0.12% at 6SS nm. We have developed a technique using 16 bit digital-to-ana log conversion which permits current control with a relative expanded unccrtaintj' of about 1 part in 65536, corresponding to an expanded uncertainty of the current of about 0.1 mA at 8 A. This corresponds to a spectral irradiance difference of approximately 0.006% for an FEL lamp at 655 nm. We describe the technique used to achieve this improvement and wc show data from a lamp demonstrating the effect of the improvement. Wc also describe the limitation provided by the uncertainty of the resistance of the current measuring shunt.

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Single particle high resolution spectral analysis flow cytometry

et al. 2006

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Background: While conventional multiparameter flow cytometers have proven highly successful, there are several types of analytical measurements that would benefit from a more comprehensive and flexible approach to spectral analysis including, but certainly not limited to spectral deconvolution of overlapping emission spectra, fluorescence resonance energy transfer measurements, metachromic dye analysis, free versus bound dye resolution, and Raman spectroscopy. Methods: Our system utilizes a diffraction grating to disperse the collected fluorescence and side-scattered light from cells or microspheres passing through the interrogation region over a rectangular charge-coupled-device image sensor. The flow cell and collection optics are taken from a conventional flow cytometer with minimal modifications to assure modularity of the system. Results: Calibration of the prototype spectral analysis flow cytometer included wavelength characterization and calibration of the dispersive optics. Benchmarking of the system demonstrated a single particle/cell intensity sensitivity of 2160 MESF of R-Phycoerythrin. Single particle spectra taken with our instrument were validated against bulk solution fluorimeter and conventional flow cytometer measurements. Coefficients of variation of integrated

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Spectral radiance calibrations

Cited by 54 publications

References 0 publications

10. The Calibration and Characterization of Earth Remote Sensing and Environmental Monitoring Instruments

10. The Calibration and Characterization of Earth Remote Sensing and Environmental Monitoring Instruments

Improved automated current control for standard lamps

Single particle high resolution spectral analysis flow cytometry

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