ASTM E1944-98(2002)

Standard Practice for Describing and Measuring Performance of Laboratory Fourier Transform Near-Infrared (FT-NIR) Spectrometers: Level Zero and Level One Tests

SIGNIFICANCE AND USE
This practice permits an analyst to compare the general performance of a laboratory instrument on any given day with the prior performance of that instrument. This practice is not intended for comparison of different instruments with each other, nor is it directly applicable to dedicated process FT-NIR analyzers. This practice requires the use of a check sample compatible with the instrument under test as described in 5.3.
SCOPE
1.1 This practice covers two levels of tests to measure the performance of laboratory Fourier transform near infrared (FT-NIR) spectrometers. This practice applies to the short-wave near infrared region, approximately 800 nm (12 500 cm-1) to 1100 nm (9090.91 cm-1); and the long-wavelength near infrared region, approximately 1100 nm (9090.91 cm-1) to 2500 nm (4000 cm-1). This practice is intended mainly for transmittance measurements of gases and liquids, although it is broadly applicable for reflectance measurements.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Mar-1998
• ICS: 17.180.30 - Optical measuring instruments
• Technical Committee: E13 - Molecular Spectroscopy and Separation Science
• Drafting Committee: E13.03 - Infrared and Near Infrared Spectroscopy

Relations

• Replaces: ASTM E1944-98 - Standard Practice for Describing and Measuring Performance of Laboratory Fourier Transform Near-Infrared (FT-NIR) Spectrometers: Level Zero and Level One Tests
• Effective Date: 10-Mar-1998
• Replaced By: ASTM E1944-98(2007) - Standard Practice for Describing and Measuring Performance of Laboratory Fourier Transform Near-Infrared (FT-NIR) Spectrometers: Level Zero and Level One Tests
• Effective Date: 01-Dec-2007
• Referred By: ASTM E2056-04(2016) - Standard Practice for Qualifying Spectrometers and Spectrophotometers for Use in Multivariate Analyses, Calibrated Using Surrogate Mixtures
• Effective Date: 10-Mar-1998
• Referred By: ASTM E1655-17 - Standard Practices for Infrared Multivariate Quantitative Analysis
• Effective Date: 10-Mar-1998
• Referred By: ASTM E1421-99(2021) - Standard Practice for Describing and Measuring Performance of Fourier Transform Mid-Infrared (FT-MIR) Spectrometers: Level Zero and Level One Tests
• Effective Date: 10-Mar-1998
• Referred By: ASTM D6122-22 - Standard Practice for Validation of the Performance of Multivariate Online, At-Line, Field and Laboratory Infrared Spectrophotometer, and Raman Spectrometer Based Analyzer Systems
• Effective Date: 10-Mar-1998

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1944–98 (Reapproved2002)
Standard Practice for
Describing and Measuring Performance of Laboratory
Fourier Transform Near-Infrared (FT-NIR) Spectrometers:
1
Level Zero and Level One Tests
This standard is issued under the fixed designation E 1944; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
-1
1. Scope wavenumbers (cm ); and spectral energy, transmittance, re-
flectance, and absorbance are signified by the letters E, T, R
1.1 This practice covers two levels of tests to measure the
and A respectively. A subscripted number signifies a spectral
performance of laboratory Fourier transform near infrared
position in nanometers, with wavenumbers in parenthesis (for
(FT-NIR) spectrometers. This practice applies to the short-
example,
wave near infrared region, approximately 800 nm (12 500
1940(5154.64)
-1 -1
A , denotes the absorbance at 1940 nm or 5154.64
cm ) to 1100 nm (9090.91 cm ); and the long-wavelength
-1
-1
cm ).
near infrared region, approximately 1100 nm (9090.91 cm )to
-1
2500 nm (4000 cm ). This practice is intended mainly for
4. Significance and Use
transmittance measurements of gases and liquids, although it is
4.1 This practice permits an analyst to compare the general
broadly applicable for reflectance measurements.
performance of a laboratory instrument on any given day with
1.2 The values stated in SI units are to be regarded as the
the prior performance of that instrument. This practice is not
standard.
intended for comparison of different instruments with each
1.3 This standard does not purport to address all of the
other, nor is it directly applicable to dedicated process FT-NIR
safety concerns, if any, associated with its use. It is the
analyzers. This practice requires the use of a check sample
responsibility of the user of this standard to establish appro-
compatible with the instrument under test as described in 5.3.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Test Conditions
5.1 OperatingConditions—Inobtainingspectrophotometric
2. Referenced Documents
data for the check sample, the analyst must select the proper
2.1 ASTM Standards:
2 instrumental operating conditions in order to realize satisfac-
E 131 Terminology Relating to Molecular Spectroscopy
tory instrument performance. Operating conditions for indi-
E 168 Practices for General Techniques of Infrared Quanti-
2 vidual instruments are best obtained from the manufacturer’s
tative Analysis
instructional literature due to the variations with instrument
E 932 Practices for Describing and Measuring Performance
2 design. It should be noted that many FT-NIR instruments are
of Dispersive Infrared Spectrometers
designedtoworkbestifleftinstandbymodewhentheyarenot
E 1252 Practice for General Techniques for Qualitative
2 in use. A record should be kept to document the operating
Analysis
conditions selected during a test so that they can be duplicated
E 1421 Practice for Describing and Measuring Performance
for future tests. Note that spectrometers are to be tested only
of Fourier Transform Infrared (FT-IR) Spectrometers:
2
withintheirrespectiverecommendedmeasurementwavelength
Level Zero and Level One Tests
(wavenumber) ranges.
3. Terminology 5.2 Instrumental characteristics can influence these mea-
surements in several ways. Vignetting of the beam (that is, the
3.1 For definitions of terms used in this practice, refer to
aperture of the sample cell is smaller than the diameter of the
Terminology E 131. All identifications of spectral regions and
near infrared beam at the focus) reduces the transmittance
absorbance band positions are given in nanometers (nm), and
value measured in nonabsorbing regions, and on most instru-
ments can change the apparent wavelength (or wavenumber)
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1
This practice is under the jurisdiction ofASTM Committee E-13 on Molecular
scale by a small amount, usually less than 0.01 nm (0.1 cm ).
Spectroscopy and is the direct responsibility of Subcommittee E 13.03 on Infrared
Focus changes can also change transmittance values, so the
Spectroscopy.
sample should be positioned in the same location in the sample
Current edition approved March 10, 1998. Published August 1998.
2
compartment for each measurement. The angle of acceptance
Annual Book of ASTM Standards, Vol 03.06.
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E1944–98 (2002)
(established by the f number) of the optics between the sample be able to use the
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