Articles by Howard Mark - Spectroscopy
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Articles by Howard Mark

Howard Mark

Columnist

Howard Mark serves on the Editorial Advisory Board of Spectroscopy and runs a consulting service, Mark Electronics that provides assistance, training, and consultation in near-IR spectroscopy as well as custom hardware and software design and development.

Articles
Calibration Transfer, Part V: The Mathematics of Wavelength Standards Used for Spectroscopy
June 1, 2014

What are the techniques and mathematics used to compute uncertainty, and the optimum methods for maintaining wavelength accuracy within instrumentation over time, when considering measurement condition changes?

2014 Review of Spectroscopic Instrumentation Presented at Pittcon
May 1, 2014

Our annual review of products introduced at Pittcon

Units of Measure in Spectroscopy, Part I: It's the Volume, Folks!
February 14, 2014

The data show that different units of measurement have different relationships to the spectral values, for reasons having nothing to do with the spectroscopy. This finding disproves the assumption that different measures of concentration are equivalent except, perhaps, for a constant scaling factor.

Calibration Transfer, Part IV: Measuring the Agreement Between Instruments Following Calibration Transfer
October 1, 2013

The statistical methods used for evaluating the agreement between two or more instruments (or methods) for reported analytical results are discussed, with an emphasis on acceptable analytical accuracy and confidence levels using two standard approaches, standard uncertainty or relative standard uncertainty, and Bland-Altman "limits of agreement."

Calibration Transfer, Part III: The Mathematical Aspects
June 1, 2013

Calibration transfer is a series of techniques used to apply a single spectral database, and the calibration model developed using that database, to two or more instruments. Here, we review the mathematical approaches and issues related to the calibration transfer process.

Appendix VI: Mass Spectrometry
May 1, 2013

Additional information from the mass spectrometry section of the Pittcon Review article.

Appendix IV: Fluorescence
May 1, 2013

Additional information from the fluorescence section of the Pittcon Review article.

Appendix V: Imaging
May 1, 2013

Additional information from the imaging section of the Pittcon Review article.

Appendix III: Components
May 1, 2013

Additional information from the components section of the Pittcon Review article.

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