ASTM C1426-1999(2004) Standard Practices for Verification and Calibration of Polarimeters《旋光计检验和校正的标准实施规范》.pdf
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1、Designation: C 1426 99 (Reapproved 2004)Standard Practices forVerification and Calibration of Polarimeters1This standard is issued under the fixed designation C 1426; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 Polarimeters and polariscopes used for measuring stressin glass are described in Test Methods F 218, C 148, andC 978. The
3、se instruments include a light source and severaloptical elements (polarizers, optical retarders, filters, and soforth) that require occasional cleaning, realigning, and calibra-tion. The objective of these practices is to describe thecalibration and verification procedures required to maintainthese
4、 instruments in calibration and ensure that the opticalsetup is within specification for satisfactory measurements.1.2 It is mandatory throughout these practices that bothverification and calibration are carried out by qualified person-nel who fully understand the concepts used in measurements ofstr
5、ess retardation and are experienced in the practices ofmeasuring procedures described in Test Methods F 218, C 148,and C 978.2. Referenced Documents2.1 ASTM Standards:2C 148 Test Methods for Polariscopic Examination of GlassContainersC 162 Terminology of Glass and Glass ProductsC 770 Test Method for
6、 Measurement of Glass StressOptical CoefficientC 978 Test Method for Photoelastic Determination of Re-sidual Stress in a Transparent Glass Matrix Using aPolarizing Microscope and Optical Retardation Compen-sation ProceduresF 218 Test Method for Analyzing Stress in Glass3. Terminology3.1 For definiti
7、ons of terms used in these practices, seeTerminology C 162.4. Principles of Verification and Calibration Procedures4.1 Verification and calibration of polarimeters are accom-plished using the following procedures:4.1.1 Procedure A: (Verification)Measure individualcomponents and their orientation to
8、ensure that the require-ments of Test Methods F 218, C 148, and C 978 are satisfied.4.1.2 Procedure B: (Calibration)Determine the accuracyof the polarimeter using a calibrated gage or retarder.5. Auxiliary Component Requirements5.1 The following are required to verify and calibrate apolarimeter:5.1.
9、1 Verification of Components (Procedure A):5.1.1.1 Verification of Polarization Effciency, a light-intensity meter, linear over the range of measured values.5.1.1.2 Verification of Quarter-Wave Plate, a Babinet com-pensator equipped polarimeter, with a monochromatic lightsource of traceable waveleng
10、th.5.1.1.3 Reference Polarizer with Known Axis.5.1.2 Calibration of Polarimeter (Procedure B):5.1.2.1 Procedure B requires a gage with a calibrated,known retardation. The calibrated gage must have sufficientretardation to calibrate the instrument within its intended userange. For example, a polarisc
11、ope/polarimeter used in TestMethods C 148 should be calibrated using a gage exhibiting aretardation range of from 0 to 227 nm (0 to 10 temper grade).5.1.2.2 Alternately, a rectangular cross-section specimenprepared from an SRM glass having a known stress-opticalconstant, subjected to uniaxial compre
12、ssion in a calibratedtesting machine, may be used instead of a calibrated gage withknown retardation.6. Verification and Calibration Procedures6.1 Procedure AVerification and Aligning of Components:6.1.1 Verification of Polarization EffciencyUsing a light-intensity meter, measure the light intensity
13、, with polarizerscrossed (dark field) and then with polarizers parallel, Ip.Calculate the polarization efficiency, E, as follows:E 5Ip Ic!Ip(1)The efficiency must satisfy the requirements of the testmethod for which the polarimeter is used for.1These practices are under the jurisdiction of ASTM Comm
14、ittee C14 on Glassand Glass Products and are the direct responsibility of Subcommittee C14.04 onPhysical and Mechanical Properties.Current edition approved Oct. 1, 2004. Published November 2004.Originally approved in 1999. Last previous addition approved in 1999 asC142699.2For referenced ASTM standa
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