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 & L- L5 ]: S. _

60825-1(ed.2)

4 P9 Q$ |; K- h) S: VStandard(s) (incl. year) Subclause(s) No. Year
IEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
' ]8 j  M2 w) H$ Q3 V/ s2 h1028
2011
Category
, W3 O& U8 I+ `' `# VMISC
Subject Keywords Developed by To be approved
9 x1 X$ J$ |; C# [( KEvaluation of spectrum of blue
: a: w5 H7 f! X: w* n9 T9 zlaser-based source projector
% E6 P3 A5 Z0 F/ cLaser projector, spectrum,
' _0 o7 c" Y. Sfluorescent layer
; `3 y0 H" L6 [0 n$ A0 K+ X. LETF 11 2013 CTL
& _# [) l- V+ }7 N. cPlenary Meeting
9 `' d- ~6 o- R" G& Y+ kQuestion
7 s4 L: L, m6 B$ C" RA 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,
6 f! Y) J, A9 f2 u% GFig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks
; y' C2 e( g; Oof green and red) are emitted from a fluorescent layer.
Is it acceptable to evaluate the eye safety hazard according to IEC 60825-1 by only assessing the
. H% G7 [* j9 s# s' n" {( m5 Wemission in blue (thus disregarding other parts of the spectrum, i.e. green and red)?
* J8 b7 X( q$ f$ b1 P0 YDecision
- I% u, v  N$ x/ b% [; }; j# `  [No. 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
levels must reflect this for each and every possible radiation hazard.
, U8 c: D3 {) Z9 |5 i! |) k& QNotes:
1. 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
5 k/ Z" |# [: ~) Xpower (from this light engine) is measured and considered in the allowable limit calculations. An
appropriate optical device may be used to filter out the blue light for the blue light hazard
9 y  D7 R; E9 g1 A: _1 k) Qmeasurements and evaluation.
2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
weapon, as it hides inside the seemingly safe broad-band white light to which users would not
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
6 _9 J, J3 P7 u, Vprecautions shall be adequately taken:
a. additional safeguarding
b. means of protection
c. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
contains high energy content.
6 `7 `8 b! t% \. ?. }% f