Photoelectric spectroradiometry and its application to the measurement of fluorescent lamps

Stair, R.

doi:10.6028/jres.046.046

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…C., in 1950 was previously reported [1,2).1 This work, h aving shown gr eat pr omise for th e instrumen ts an~ l!lethod employed , mdu ced the attemp t to m ak e snmlal' m eas urem en ts at a high-altitude station. An invitation from Donald H. M en zel to m a k e use of one of the H ar vard high-altitude stations for this work was opportune.…”

Section: Introductionmentioning

confidence: 65%

Ultraviolet radiant energy from the sun observed at 11,190 feet

Stair¹

1952

J. RES. NATL. BUR. STAN.

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This p a.p er gives t he res ul ts of so me m eas urem ents o n th e ultra vi olet a nd shor t wa vele ngt? visible sp ectra l energy distributio n of direct solar r a di at io n, ma de in Sep tember 1951 , a t Cllmax, . Col?, a ltitude 11 ,190 feet . D ata a re g iven for wa v elengths exte nd ing from 535 to 290.5 mIiiLmlCro ns for a number of a ir masses fr om 0 to 3.0) . A det erminat ion of atm ospheri c t ra ns mitt an ce as a fun cti o n of wa vele ngt h res ul ts in calcula t ed a mo un ts of ozo ne approximat ing 0 .21 ce ntimeter (ni p) for severa l d ays durin g September. Thi s value is in good agree m ent wit h previ o llS determinat io ns by other meth od s, fo r the season of th e year an d t he geogr a phi cal latit ud e of Cltmax.

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Section: Introductionmentioning

confidence: 65%

Ultraviolet radiant energy from the sun observed at 11,190 feet

Stair¹

1952

J. RES. NATL. BUR. STAN.

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“…The spectral-energy distribution of such a source is given in table 1. For convenience of modulation by a sector disk [11], a source concentrated in space is preferred. However, as no such source is commercially available, a bank of five Westinghouse Sterilamps (nonozone type) was assembled, with a 2-in.…”

Section: Table 1 M Ethod Employed In the Calculation Of Ozone Valuesmentioning

confidence: 99%

“…One purpose of the modulated beam is to eliminate as far as possible t he effect of other sources of light that m ight fall upon the photodetector. Other frequencies, in particular 120 c/s, were considered bu t were ui scarued in favor of the 510 cy [11].…”

Section: Table 1 M Ethod Employed In the Calculation Of Ozone Valuesmentioning

confidence: 99%

Continuous measurement of atmospheric ozone by an automatic photoelectric method

Stair¹,

Bagg²,

Johnston³

1954

J. RES. NATL. BUR. STAN.

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An au tomatic photoelectric instrument and method for t he continuous meas urement of t he ozone in the earth's atmosphere at low altitudes are described. The method is physical rather t han chemical in character and is based upon t he optical absorption characteristics of ozone in the Hartley and Huggins ul t raviolet bands. Th e ins trument makes use of a lowpressure mercury are, which is situated at a di stance of 1,450 feet from the reco rding s tation t hat emp loys a 1P28 photo mult iplier as a d etector . The lig ht beam is modulated, at 510 cycles per se cond, so that the output of t he photomultiplier is fed into a t uned alternatingcurrent ampllfier and amphfied to the recorder level. By means of a Geneva m ec han is m which changes t he glass filters, the radiant energy from t he lamp is separated into band~ primarily at wavelengths 253 .7, 365.5, a nd 405 .0 millimi cro ns. From the ratios of the de1kctions for t he different spectral regions it is possible to d etermine ozone concentration in t he range from a few te nths of 1 part to many p ar ts per 100 million.

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“…Before proceeding with the establishment of a standard of spectral irradiance for the region of 0.25 to 2.6 microns based upon the radiance of a blackbody at a known temperature, a study was made of possible lamp designs. First thought was given to the specially constructed tungstenin-quartz lamp previously employed in this laboratory [12][13] / as a standard of spectral irradiance based upon color temperature and the published spectral emissivity data for tungsten.…”

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confidence: 99%

A new standard of spectral irradiance

Stair¹

1963

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The National Bureau of Standards has made available a new standard of spectral irradiance in the form of a 200-watt quartz-iodine lamp with a coiled-coil tungsten filament operating at about 3000°K and calibrated over the spectral range of 0.25 to 2.6 microns. The calibration of this standard is based upon the radiance of a blackbody as defined by the Planck law of radiation since it was done by comparisons with the NBS standards of spectral radiance, of luminous intensity, and of total irradiance, each of which was established through the use of blackbodies. This standard is used without auxiliary optics. Because of its small physical size and high operating temperature, relatively high spectral irradiances may be obtained through its use. 1 .

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Photoelectric spectroradiometry and its application to the measurement of fluorescent lamps

Cited by 13 publications

References 6 publications

Ultraviolet radiant energy from the sun observed at 11,190 feet

Ultraviolet radiant energy from the sun observed at 11,190 feet

Continuous measurement of atmospheric ozone by an automatic photoelectric method

A new standard of spectral irradiance

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