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

60825-1(ed.2) & N7 B7 J5 D; W2 p! j/ R$ S( O

Standard(s) (incl. year) Subclause(s) No. Year
/ d6 t% F- Y) ~8 Q' l: OIEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
1028
+ @; V# i8 S% f2011
7 ^' L% V! k1 C: nCategory
MISC
Subject Keywords Developed by To be approved
* j0 I% ]! p" H1 I) C0 YEvaluation of spectrum of blue
3 W3 W; l  W3 p5 o1 e* Olaser-based source projector
* Q- v2 i' d; SLaser projector, spectrum,
fluorescent layer
ETF 11 2013 CTL
$ O, f2 d# a  W9 B5 C; kPlenary Meeting
Question
6 P$ y. z! y) W2 X. K/ Q" O6 ^4 VA laser-based light engine projector emits a white light spectrum with three dominant colours (see the
& V1 w4 v6 }4 Coptical 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
% |$ j/ `; S  {4 F5 T  [6 xof green and red) are emitted from a fluorescent layer.
, e- m( c7 U8 `) e9 OIs it acceptable to evaluate the eye safety hazard according to IEC 60825-1 by only assessing the
8 ?3 `' L" `  b# i1 t  Iemission in blue (thus disregarding other parts of the spectrum, i.e. green and red)?
Decision
6 W6 S5 w$ v, kNo. 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.
Notes:
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
power (from this light engine) is measured and considered in the allowable limit calculations. An
5 Y6 p8 R2 z7 I: Iappropriate optical device may be used to filter out the blue light for the blue light hazard
, t8 p3 L: t9 S5 `9 k1 r9 Pmeasurements and evaluation.
3 m% P# l: |- C, o  g5 }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
3 C4 p$ }. e7 m  R4 |3 A6 R, eapply their behavioural/precautionary safety guard as they would to a sharp, bright, and
* M  X' `1 k5 Q2 pcollimated blue laser beam. During the evaluation of the blue laser beam the following extra
precautions shall be adequately taken:
/ c  @/ C7 k6 ?% G! [5 ~; b8 c0 Ta. additional safeguarding
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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