DSH 1028 Evaluation of spectrum of blue laser-based source projector

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DSH 1028

Evaluation of spectrum of blue laser-based source projector

8.3 & 9 ' R5 X3 ^' x$ c" `

60825-1(ed.2)

Standard(s) (incl. year) Subclause(s) No. Year
! K" h% j  i- K- f  pIEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
8 I' s/ Y9 e2 ~' }' \3 H1 s) s1028
! ^8 D- o) c, N9 D) P: |2011
- A" u- }) o* M8 \/ fCategory
) R( J$ a9 a* W4 h; Q4 Z  nMISC
% B6 `' Y; W" m* PSubject Keywords Developed by To be approved
8 H9 o, F" x/ pEvaluation of spectrum of blue
laser-based source projector
Laser projector, spectrum,
fluorescent layer
ETF 11 2013 CTL
- H1 H4 q! x6 Y6 a* F% FPlenary Meeting
Question
A laser-based light engine projector emits a white light spectrum with three dominant colours (see the
optical spectrum, Fig. 1 below, in comparison with the optical spectrum of a mercury lamp projector,
Fig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks
of green and red) are emitted from a fluorescent layer.
- z; p! V" `  Y6 k. \* rIs it acceptable to evaluate the eye safety hazard according to IEC 60825-1 by only assessing the
emission in blue (thus disregarding other parts of the spectrum, i.e. green and red)?
' v! ~" L/ f5 C% \Decision
- p7 l$ z) y0 T7 XNo. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated
to the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
Measurements for calculations and determination of the respective applicable accessible emission
+ G* U5 V+ Z0 @8 C  v0 olevels must reflect this for each and every possible radiation hazard.
: \. ]0 h* d' ~( J; G4 |Notes:
  u5 N( q- |( t5 ?3 u1 E4 q1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the
more stringent hazard limit for blue light, this blue light hazard may be over-classified if the total
* G& x. U4 {1 T8 M+ ^  j5 w$ Cpower (from this light engine) is measured and considered in the allowable limit calculations. An
% s5 G# `1 [- C: ~2 r& Gappropriate optical device may be used to filter out the blue light for the blue light hazard
! q( S/ m: A( d% h' h' f3 ]- ?measurements and evaluation.
2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
' F) H! X2 o; L% P) m& pweapon, as it hides inside the seemingly safe broad-band white light to which users would not
3 o1 l% S) {2 S* {apply their behavioural/precautionary safety guard as they would to a sharp, bright, and
collimated blue laser beam. During the evaluation of the blue laser beam the following extra
& W% A. z$ e, m+ uprecautions shall be adequately taken:
a. additional safeguarding
b. means of protection
/ I  S; e1 s, F# Qc. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
contains high energy content.
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