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 - @$ i/ N" l5 G6 J

60825-1(ed.2) 6 K. B: O  ^, ~/ w: [

; E& L# b0 G7 @. FStandard(s) (incl. year) Subclause(s) No. Year
IEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
1028
2011
% f8 b  j& l4 s' KCategory
MISC
3 }3 K7 d4 y. f# {' u& E2 U, lSubject Keywords Developed by To be approved
Evaluation of spectrum of blue
! W$ C  F6 P8 O* ^( q& klaser-based source projector
Laser projector, spectrum,
fluorescent layer
ETF 11 2013 CTL
Plenary Meeting
( ?* t/ T' {, U& z( J& jQuestion
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,
0 n# q4 K" d1 Q; e2 s6 ^Fig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks
0 k5 z# P2 ], A. c$ X# [; L4 n+ Cof 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
# l9 [9 Y* V- k7 ?2 \No. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated
& X6 U9 J/ ~: ?( C# u( uto the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
Measurements for calculations and determination of the respective applicable accessible emission
9 e1 v& K1 A$ R) M; {levels must reflect this for each and every possible radiation hazard.
/ W8 T$ j9 M" M# Q) @Notes:
4 f6 V# }2 e: d7 n- |1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the
' I" I: v9 B) ]+ {, m5 Zmore 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
, v6 x% g3 W8 o3 W$ x/ zappropriate optical device may be used to filter out the blue light for the blue light hazard
" p* q" O1 w) m* C2 T8 i7 U8 Kmeasurements and evaluation.
2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
: ^9 E9 U! C' ^6 M) C+ Wweapon, 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
6 Y+ \. H' A5 V- m9 ~) W* L7 lprecautions shall be adequately taken:
" Q' Z/ p* z. z5 D! l! Oa. additional safeguarding
4 i9 f6 r1 T) E3 f. ^b. means of protection
c. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
5 `5 M) a) N7 C5 b" ]% ccontains high energy content.
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