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 ' }* O6 y: P3 Z7 M& l8 ~9 I

8.3 & 9

60825-1(ed.2) 9 O4 u1 L2 A5 e9 f) A* ~! Y

! \+ o2 X5 y! t5 j6 `Standard(s) (incl. year) Subclause(s) No. Year
2 B* _) ~( o$ G) n; R+ U7 GIEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
1028
$ C/ R8 ^. v" e, w" A2 n2011
4 K7 K! D5 a' d, a, n! F1 GCategory
1 @5 B  J  p: QMISC
Subject Keywords Developed by To be approved
, @$ |0 z+ m4 Y8 LEvaluation of spectrum of blue
laser-based source projector
) H& x! a8 U5 r6 @" ?: ]% tLaser projector, spectrum,
fluorescent layer
1 r$ ?! }5 N. X2 AETF 11 2013 CTL
Plenary Meeting
Question
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,
Fig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks
: {5 R7 |7 l, T1 k2 P) {- u1 x* A7 F3 Gof green and red) are emitted from a fluorescent layer.
7 M' l& ^* n! sIs 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)?
4 y7 q7 \5 P9 Z4 [/ Y; _' o  oDecision
8 W4 }2 p  b1 CNo. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated
& ]/ M6 V  p" U2 l9 l* L3 I  Vto the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
& [3 i! a% _/ ?1 e( b* \Measurements for calculations and determination of the respective applicable accessible emission
levels must reflect this for each and every possible radiation hazard.
# p; K6 z& m. M+ ?+ ^5 ?7 D1 WNotes:
1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the
/ w  ?/ p. Z1 n3 wmore stringent hazard limit for blue light, this blue light hazard may be over-classified if the total
5 K; s7 t' k; B: dpower (from this light engine) is measured and considered in the allowable limit calculations. An
0 c5 B  }2 }2 l5 b4 bappropriate optical device may be used to filter out the blue light for the blue light hazard
5 e9 E- W: D; j5 k; Nmeasurements and evaluation.
( y. B' t0 s5 \$ _2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
/ i- p4 p' G- u/ a5 eweapon, as it hides inside the seemingly safe broad-band white light to which users would not
  j+ r1 }; w! [. r/ j; ?# Y  Napply 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
* n, ?1 {6 F* e/ q. `- v! hprecautions shall be adequately taken:
) R3 @( J+ O$ N" va. additional safeguarding
9 V' [, s' q2 h- ub. means of protection
: k( L/ Y, E/ t! e' pc. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
contains high energy content.

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