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

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广东安规检测
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DSH 1028

Evaluation of spectrum of blue laser-based source projector

8.3 & 9 3 O4 {" y. U- @5 q

60825-1(ed.2)

Standard(s) (incl. year) Subclause(s) No. Year
IEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
5 \/ D/ _; d" u  U1028
2011
Category
) f+ ?6 I- h, m2 KMISC
Subject Keywords Developed by To be approved
# S' u6 Q; M" C1 P' d; D( ~+ D( a- uEvaluation of spectrum of blue
laser-based source projector
9 Y# G- V) x) ~' xLaser projector, spectrum,
fluorescent layer
ETF 11 2013 CTL
Plenary Meeting
Question
A laser-based light engine projector emits a white light spectrum with three dominant colours (see the
8 v, O* k$ w' W- x- @5 R- poptical 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.
Is 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
6 k: M, s! g+ i- sNo. 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.
/ Q3 u0 G% |9 D; Q+ g: w( CMeasurements for calculations and determination of the respective applicable accessible emission
% q: F2 G0 e9 l* nlevels must reflect this for each and every possible radiation hazard.
& l7 q" s$ W7 Z6 q6 gNotes:
) E+ j0 @/ u2 v, F' y. I1. 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
' l7 T  W+ {% p. j, K" s9 t! \power (from this light engine) is measured and considered in the allowable limit calculations. An
+ ~; y+ C  `1 V: o" |3 |! tappropriate optical device may be used to filter out the blue light for the blue light hazard
measurements and evaluation.
( W6 t  W4 r# }; q2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
8 l2 l0 h' W) d$ }5 J" Z& q" Sweapon, 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
4 [1 b* g9 I) q' z+ ucollimated blue laser beam. During the evaluation of the blue laser beam the following extra
4 J0 f' e, W) Z7 }precautions 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.