ISO 14490-5:2021 Optics and photonics — Test methods for telescopic systems —Part 5: Test methods for transmittance
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Optics and photonics — Test methods for telescopic systems —Part 5: Test methods for transmittance是国际标准化组织于2021-06发布的ISO标准，适用于全球。标准截图
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Optics and photonics — Test methods for telescopic systems —
Part 5: Test methods for transmittance
1 Scope
This document specifies the test methods for the determination of the transmittance of telescopic systems and telescopic observational instruments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/CIE 11664-1:2019, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 14132-1, Optics and photonics — Vocabulary for telescopic systems — Part 1: General terms and alphabetical indexes of terms in ISO 14132
ISO 14490-1:2005, Optics and optical instruments — Test methods for telescopic systems — Part 1: Test methods for basic characteristics
CIE 18.2:1983, Basis of Physical Photometry
3 Terms a nd definiti ons
For the purposes of this document, the terms and definitions given in ISO 14132-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://w ww .iso. org/o bp
— IEC Electropedia: available at http://w ww .electropedia .org/ 4 Principle
To determine the spectral transmittance, τλ , the flux of radiation in a limited bundle of rays will be ()
measured before entering Φ ()λ and after passing Φ ()λ through the optical system.
0 p
The spectral transmittance is given by Formula (1):
Φ ()λ
p
τλ = (1)
()
Φ ()λ
0
During the spectral measurement, the emergent light of the radiation source will be limited to a narrow wavelength band by means of a monochromator or a set of filters.
5 Test arrangement
5.1 General
The test arrangement as given in Figure 1 and Figure 2 consists of a radiation source (optionally with a condenser, a monochromator or a set of filters, a selectable diaphragm as field stop, a collimator lens, an aperture stop, a test specimen mounting, an integrating sphere, a radiation detector and a signal processing unit comprising a radiation detector and a measurement and evaluation unit).
Key
1 radiation source 6 aperture stop
2 condenser 8 integrating sphere
3 monochromator/set of filters 9 radiation detector
4 selectable diaphragm as field stop 10 baffle
5 collimator lens 11 measurement and evaluation unit
Figure 1 — Test arrangement without test specimen (schematic)
Key
1 radiation source 7 test specimen
2 condenser 8 integrating sphere
3 monochromator/set of filters 9 radiation detector
4 selectable diaphragm as field stop 10 baffle
5 collimator lens 11 measurement and evaluation unit
6 aperture stop Figure 2 — Test arrangement with test specimen (schematic)
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