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Spectral irradiance of UVB lamps at different temperatures.

Source: R/qp-uvb313-temp.r
qp_uvb313_temp.spct.Rd

Dataset of spectral irradiance from a set of two Q-Panel UVB-313 40W fluorescent tubes, measured at different temperatures.

Usage

qp_uvb313_temp.spct

qp_uvb313_temp.mspct

Format

qp_uvb313_temp.spct is a "source_spct" object with 777 rows (290 nm to 400 nm, 1.0 nm step) and 3 variables.

The variables are as follows:

  • temperature (C)

  • w.length (nm)

  • s.e.irrad (W m-2 nm-1)

qp_uvb313_temp.mspct is a "source_mspct" object containing a collection of "source_spct" objects, each with 111 rows (290 nm to 400 nm, 1.0 nm step) and 2 variables.

The variables in the member spectra are as follows:

  • w.length (nm)

  • s.e.irrad (W m-2 nm-1)

An object of class source_mspct (inherits from generic_mspct, list) with 7 rows and 1 columns.

Details

Absolute values are comparable among the different temperatures. The lamps and the cosine diffuser were located inside a Conviron growth chamber. The measurements were done with a recently calibrated Macam double-monochromator spectroradiometer located outside the chamber and maintained at constant room temperature of 22 C. After each change in the temperature controller set-point enough time was allowed after the temperature had stabilized inside the chamber, for the output of the lamps to also become stable.

qp_uvb313_temp.spct contains data for different temperatures in a "tidy" long form with a factor indicating the temperature at which the lamp was during measurement.

qp_uvb313_temp.mspct contains the same data as a collection of spectra stored in a "source_mspct" object, with member "source_spct" objects named minus5C, plus00C, plus05C, plus10C, plus20C, plus30C, and plus35C.

The variables in each member spectrum are as follows:

  • w.length (nm)

  • s.e.irrad (\(\mathrm{W\,m^{-2}\,nm^{-1}}\))

Note

Instrument used: Macam SR-9010-PC scanning double monochromator spectroradiometer with a cosine corrected input optics. Recently calibrated. The lamps were driven by a high frequency electronic ballast.

References

Aphalo, P J, R Tegelberg, and R Julkunen-Tiitto. 1999. The Modulated UV-B Irradiation System at the University of Joensuu. Biotronics 28: 109–120. https://cir.nii.ac.jp/crid/1050001335921484032?lang=en.

Examples

qp_uvb313_temp.mspct[["plus20C"]]
#> Object: source_spct [111 x 3]
#> containing 7 spectra in long form
#> Wavelength range 290-400 nm, step 1 nm 
#> Label: Fluorescent tube: Q-Panel UVB313 40W at 20C 
#> Measured on 1997-05-19 UTC 
#> Variables:
#>  w.length: Wavelength [nm]
#>  s.e.irrad: Spectral energy irradiance [W m-2 nm-1] 
#> --
#> # A tibble: 111 × 3
#>    temperature w.length s.e.irrad
#>          <dbl>    <int>     <dbl>
#>  1          20      290 0        
#>  2          20      291 0        
#>  3          20      292 0.0000496
#>  4          20      293 0.000379 
#>  5          20      294 0.00126  
#>  6          20      295 0.00321  
#>  7          20      296 0.00673  
#>  8          20      297 0.0182   
#>  9          20      298 0.0226   
#> 10          20      299 0.0289   
#> # ℹ 101 more rows