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 4 s: t- }0 h% @8 W: f

8.3 & 9 # _3 Z; W) q1 B

60825-1(ed.2) ! I% w0 O4 \" ^& t

" @- ?) K8 B4 Q+ WStandard(s) (incl. year) Subclause(s) No. Year
4 q% u- z* S, R% YIEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
1028
2011
7 Y' ^( K* D% x3 c8 |7 MCategory
MISC
Subject Keywords Developed by To be approved
Evaluation of spectrum of blue
laser-based source projector
Laser projector, spectrum,
fluorescent layer
ETF 11 2013 CTL
Plenary Meeting
4 U% S. A& t7 I6 T3 j! I: sQuestion
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,
$ c" ]- \4 x: }- TFig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks
. I% e, i2 A1 y7 Vof green and red) are emitted from a fluorescent layer.
, r- H4 {6 @' H1 \7 N* R* f2 pIs 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)?
3 A. k: \' `7 A% P# JDecision
No. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated
# g5 S: {- _2 i0 Rto the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
7 Q5 |8 U% W5 F" l5 b7 }& n; PMeasurements for calculations and determination of the respective applicable accessible emission
levels must reflect this for each and every possible radiation hazard.
Notes:
. h) V3 p! ^4 E/ x1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the
6 i) c/ G! d2 f+ Vmore stringent hazard limit for blue light, this blue light hazard may be over-classified if the total
% U/ X: x  I: `  i5 c4 mpower (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
( ?0 g4 K* l8 n" `0 z, u( imeasurements and evaluation.
2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
5 j, g' ?: M& Q. K  d- b3 l' N8 q, C8 B& xweapon, as it hides inside the seemingly safe broad-band white light to which users would not
- g7 o4 G1 z4 A% c" Papply their behavioural/precautionary safety guard as they would to a sharp, bright, and
$ R4 j4 C! m/ T  U8 w8 q( e4 Wcollimated blue laser beam. During the evaluation of the blue laser beam the following extra
precautions shall be adequately taken:
a. additional safeguarding
, ]5 m8 v* \1 I9 y8 A" N; E9 `b. means of protection
c. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
contains high energy content.

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