Photobiological Measurement Per IEC Solutions Overview. Gooch and Housego (Orlando)
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1 Photobiological Measurement Per IEC Solutions Overview Gooch and Housego (Orlando)
2 IEC Photobiological Safety of Lamps and Lamp Systems Objectives include evaluation and control of optical radiation hazards from lamps at points of human access through standardization of measurement techniques. Deals with spectroradiometric measurements of not point but extended sources emitted in terms radiance and irradiance. Sources can be altered by filtration, projection and diffusing optics in terms of distribution and spectral content. Takes into consideration distance, projected size, retinal hazard and response. Provides recommendations measurement technique and instrumentation to be used. GENERAL PRESENTATION FEB13 PAGE 2
3 Source Measurement The most common measurements of sources include: Radiance - Light emitted in a particular direction Irradiance Light falling onto a surface Total flux Total light emitted in all directions GENERAL PRESENTATION FEB13 PAGE 3
4 IEC Relevant Parameters Skin or cornea hazard Actinic UV Skin and Eye: nm (E S ) Eye UV: nm (E UVA ) Blue Light Small Source: nm (E B ) Eye IR: nm (E IR ) Skin Thermal nm (E H ) Retinal hazard Blue Light: nm (L B ) Retinal Thermal: nm (L R ) Retinal Thermal (weak): nm (L IR ) GENERAL PRESENTATION FEB13 PAGE 4
5 Radiance Measurement Source Solid Collection angle Measurement area Radiance is normally measured with a telescope The solid collection angle corresponds to the size of the lens The measurement area corresponds to the field-ofview of the telescope GENERAL PRESENTATION FEB13 PAGE 5
6 Radiance Measurement Source Measurement area Solid Collection angle The term radiance in this section also refers to related units such as luminance and radiant intensity Radiant intensity applies to small or distant objects that are smaller than the telescope field-of-view GENERAL PRESENTATION FEB13 PAGE 6
7 Radiance Measurement Gooch & Housego, Inc. manufactures a large range of telescope, microscope and imaging optic modules for radiance measurements GENERAL PRESENTATION FEB13 PAGE 7
8 Imaging Telescopes For luminance and radiance of sources from 200 nm to 14,000 nm Reflex viewing or camera Adjustable focus and field of view Wide range of lenses choices GENERAL PRESENTATION FEB13 PAGE 8
9 Imaging Telescopes For luminance and radiance of sources from 200 nm to 14,000 nm Here is how it works Light coming from the source GENERAL PRESENTATION FEB13 PAGE 9
10 Imaging Telescopes For luminance and radiance of sources from 200 nm to 14,000 nm The sectional drawing shows what happens inside the solid housing If the mirror is flipped out of the way is picked up at some distance and focussed by the OL GENERAL PRESENTATION FEB13 PAGE 10
11 Imaging Telescopes For luminance and radiance of sources from 200 nm to 14,000 nm The image is sent via the field-of-view aperture to the spectroradiometer GENERAL PRESENTATION FEB13 PAGE 11
12 Radiance Measurement Putting together an OL 750 radiance system We start with an OL 750 monochromator Positive location & easy assembly And a detector Then we add the imaging telescope GENERAL PRESENTATION FEB13 PAGE 12
13 Radiance Measurement We have a complete radiance measurement system! GENERAL PRESENTATION FEB13 PAGE 13
14 Irradiance and Total Flux Measurement To measure irradiance (or illuminance), a cosine response integrating sphere such as the OL IS-670 is substituted for the imaging telescope To measure total flux, a large sphere (typically 18 to 76 inches) is substituted for the OL GENERAL PRESENTATION FEB13 PAGE 14
15 Irradiance Measurement A complete irradiance measurement system OL IS-670 near-perfect cosine response integrating sphere GENERAL PRESENTATION FEB13 PAGE 15
16 Excel IEC Computation Template Library of templates available for a variety of applications. Direct reporting capability in OL 750 Application software allows for turn-key operation and analysis of data. IEC Specific parameters can be tailored to facilitate post-capture presentation. GENERAL PRESENTATION FEB13 PAGE 16
17 Summary Objectives of IEC are the evaluation and control of optical radiation hazards from lamps at points of human access through standardization of measurement techniques. Considers skin, cornea and retinal hazard. OL 750D Platform offers all capabilities required to measure, analyze and easily report relevant IEC quantities. Modular and flexible design allow for easy adaptation to other applications beyond IEC GENERAL PRESENTATION FEB13 PAGE 17
18 For more information find us at: GENERAL PRESENTATION FEB13 PAGE 18
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