Advantages of white LED lamps and new detector technology in photometry

Tomi Pulli; Timo Dönsberg; Tuomas Poikonen; Farshid Manoocheri; Petri Kärhä; Erkki Ikonen

doi:10.1038/lsa.2015.105

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Advantages of white LED lamps and new detector technology in photometry

Original Articles

- Advantages of white LED lamps and new detector technology in photometry
- Light: Science & Applications Vol. 4, Issue 3, (2015)
- Affiliations：
  
  1.Metrology Research Institute, Aalto University, Espoo, Finland
  2.MIKES Metrology, VTT Technical Research Centre of Finland Ltd, Espoo, Finland
- Author bio：
  
  T Pulli, Email: tomi.pulli@aalto.fi
- Funds：
- DOI：10.1038/lsa.2015.105
  CLC：
- Published：2015-09，
  
  Published Online：01 June 2015，
  
  Received：12 December 2014，
  
  Revised：22 May 2015，
  
  Accepted：27 May 2015
- Accepted：
Scan QR Code
Pulli, T. et al. Advantages of white LED lamps and new detector technology in photometry. Light: Science & Applications, 4, e332 (2015).
DOI：

Pulli, T. et al. Advantages of white LED lamps and new detector technology in photometry. Light: Science & Applications, 4, e332 (2015). DOI： 10.1038/lsa.2015.105.

摘要

Abstract

Light emitting diode (LED) lighting is becoming more and more popular

as incandescent lamps are being phased out globally. LEDs have several advantages over incandescent lamps

including energy efficiency

robustness

long lifetime

and good temporal stability. The three latter features make LEDs attractive candidates as new photometric standards. Because the spectra of white LEDs are limited to the visible wavelength range

a novel method for the realization of photometric units based on the predictable quantum efficient detector (PQED) can be utilized. The method eliminates the need of photometric filters that are traditionally used in photometry

and instead relies on carrying out the photometric weighting numerically based on the measured relative spectrum of the source. The PQED-based realization simplifies the traceability chain of photometric measurements significantly as compared with the traditional filter-based method. The measured illuminance values of a white LED deviate by only 0.03% when determined by the new and the traditional methods. The new PQED method has significantly lower expanded uncertainty of 0.26% (

= 2) as compared with that of the traditional filter-based method of 0.42% (

= 2). Furthermore

when filtered photometers that measure LED lighting are calibrated using LED lamps as calibration sources instead of incandescent lamps

a significant decrease in the uncertainty related to the spectral mismatch correction can be obtained. The maximum spectral mismatch errors of LED measurements decreased on average by a factor of 3 when switching from an incandescent lamp to an LED calibration source.

关键词

Keywords

LEDoptical metrologyphotometrystandard lamp

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