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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | % Psychtoolbox:PsychISO2007MPE.
%
% Partial and in progress implementation of ISO 2007 standard for computing
% maximum permissable exposure to broadband lights.
%
% *****************************************************************
%
% IMPORTANT
%
% Individuals using these routines must accept full responsibility
% for light exposures they implement. We recommend that values computed
% with these routines be carefully checked against independent calculations.
% We have done our best to follow the standard, but it is very complex and
% there may be errors.
%
% *****************************************************************
%
% NOTES:
%
% a) As of June, 2013, these routines are still very much a work
% in progress and should thus be treated with special caution. See
% ISO2007MPEBasicTest. If someone has some worked out test cases
% it would be great to check those against the computations done
% by this suite of routines. Please contact me (brainard@psych.upenn.edu)
% if you can help.
%
% b) Only the Type 1 limits are computed. My impression is that these are
% more conservative, and that if you stay below them you good wrt the
% standard content. I believe that technically, a Type 1 instrument is
% one that *cannot* produce more light than the Type 1 limits, but it seems
% to me that for research purposes the main point is to stay below those limits
% independent of what the instrument could in principle produce.
%
% In addition, for exposure durations of less than 2 hours (7200) seconds, the
% Type 2 limits are more lenient than the Type 1 limits, except for 5.5.1.5b versus
% 5.4.1.6b, where the worst case Type 2 limit is a little lower (5.88 W/[sr-cm2]
% than the Type 1 limit (6 W/[sr-cm2]). To be conservative, I used the 5.88 value
% in the relevant routine.
%
% If someone knows more or has a different view, please let me (DHB, brainard@psych.upenn.edu) know.
%
% c) There is a limit (Table 2, 5.4.1.5) for convergent beams, which I think is what
% a Maxwellian view produces. I wrote a placeholder routine for this limit, but since
% I am not currently using such a rig I don't have any application for it and have
% not tested it.
%
% d) The standard uses cm^2 based units for radiance, irradiance, etc. It switches
% between uWatts, mWatts, and Watts depending on which limit is being considered.
% For uniformity, these routines return all quantities and limits in uWatts, cm^2
% based units.
%
% For input, we typically measure radiance in Watts/[sr-m^22] and all the routines take
% radiance as input and convert as necessary (with the help of passed ancilliary arguments).
% To match the measurement instrumentation we use, the radiance units are kept in
% units of Watts/[sr-m^22], and the routines do the appropriate converstions.
% these are the input units expected. The one exception on the input is the convergent beam limit,
% where the input is irradiance and should be passed in uWatts/cm^2. The help text is pretty
% clear about what is desired for each routine.
%
% e) For computations of retinal illumiance, these routines used a default eye length of 17 mm.
% This does not seem to be specified in the standard, but is the number given in the Landry et.
% al (2011) paper.
%
% REFERENCES.
% Ansi ISO 15004-2 (2007). Ophthalmic instruments - Fundamental requirements and test methods -
% Part 2: Light hazard protection. [The standard document. Tables listed below are in
% this document.]
%
% Landry, R. J. et al. (2011). Retinal phototoxicity: A review of standard methodology for evaluating retinal optical
% radiation hazards. Health Physics, 100(4), pp. 417-434. [This review paper unpacks the standard
% a bit and is a helpful source.]
%
% ISO2007MPEBasicTest - Test the suite of routines. Generates many figures that should match those in the standard.
% ISO2007MPECheckType1ContinuousRadiance - Wrapper function for comparing a measured radiance to MPE limits.
% ISO2007MPEComputeType1ContinuousAntConvrgUnweightedValue - Placeholder (not tested) for convergent beam limit. Table 2, 5.4.1.5.
% ISO2007MPEComputeType1ContinuousCornealIRUnweightedValue - As the name indicates. Table 2, 5.4.1.4.
% ISO2007MPEComputeType1ContinuousCornealUVUnweightedValue - As the name indicates. Table 2, 5.4.1.2.
% ISO2007MPEComputeType1ContinuousCornealUVWeightedValue - As the name indicates. Table 2, 5.4.1.1.
% ISO2007MPEComputeType1ContinuousRadiancePCWeightedValue - As the name indicates. Table 2, 5.4.1.3.b
% ISO2007MPEComputeType1ContinuousRadianceTHWeightedValue - As the name indicates. Table 2, 5.4.1.6.b
% ISO2007MPEComputeType1ContinuousRetIrradiancePCWeightedValue - As the name indicates. Table 2, 5.4.1.3.a
% ISO2007MPEComputeType1ContinuousRetIrradianceTHWeightedValue - As the name indicates. Table 2, 5.4.1.6.a
% ISO2007MPEGetWeigthtings - Get the spectral weighting functions needed by the standard.
% ISO2007MPEPrintAnalysis - Formatted print of output returned by ISO2007MPECheckType1ContinuousRadiance.
%
% ISO2007MPETableA1.txt - Table A1 of the standard as tab delimited text.
% ISO2007MPETableA2.txt - Table A2 of the standard as tab delimited text.
% Copyright (c) 2013 by David Brainard
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