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) + j: f4 s+ C: _' t! a7 n9 v- u) M

' D) ?; z5 |8 d* ^. hStandard(s) (incl. year) Subclause(s) No. Year
: u& j& U, I$ G$ \* h* M8 j# i) mIEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
1028
2011
Category
% u- ^3 w5 O( q# d# @. ?5 Y# FMISC
4 V+ k" R. @/ T1 bSubject Keywords Developed by To be approved
Evaluation of spectrum of blue
3 t5 Z% J. U/ Z3 claser-based source projector
  @" s3 m6 F$ P6 u, G" C, ^9 DLaser projector, spectrum,
% N: e0 P$ i; z9 N  Z. t9 L7 Dfluorescent layer
& E% Q% ^0 o& a5 Z0 Z& T* d" S- FETF 11 2013 CTL
Plenary Meeting
Question
A laser-based light engine projector emits a white light spectrum with three dominant colours (see the
- M7 g/ w4 R8 V, d& w" L& moptical spectrum, Fig. 1 below, in comparison with the optical spectrum of a mercury lamp projector,
) X1 o9 T% f4 v9 E1 M" }! c/ zFig. 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.
6 L9 _1 [  \  S1 ~: D( ]5 x9 y- jIs 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)?
Decision
. S* h+ i% D- u( UNo. 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
. l$ U. s0 @7 t. L8 S+ D% i1 flevels 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
/ }. [6 Y4 U4 A8 O! @3 k: ?% qmore stringent hazard limit for blue light, this blue light hazard may be over-classified if the total
! Q+ s" k: S5 {) ~power (from this light engine) is measured and considered in the allowable limit calculations. An
  ~( y, b7 O; J" ?' ]appropriate optical device may be used to filter out the blue light for the blue light hazard
measurements and evaluation.
& J* @& I6 I2 I" W2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
+ e+ S0 p: G1 G, y; A/ X, v! L7 ?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
precautions shall be adequately taken:
: n8 K9 M" {0 w. p  r9 ra. additional safeguarding
b. means of protection
c. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
/ n" P' _6 K' Ocontains high energy content.

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