An analytic method for spectrum recovery from wedge or staircase spectrometers

Michael K. Yetzbacher; Christopher W. Miller; Michael J. DePrenger

doi:10.1117/12.2303980

14 May 2018 An analytic method for spectrum recovery from wedge or staircase spectrometers

Michael K. Yetzbacher, Christopher W. Miller, Michael J. DePrenger

Proceedings Volume 10657, Next-Generation Spectroscopic Technologies XI; 106570F (2018) https://doi.org/10.1117/12.2303980
Event: SPIE Commercial + Scientific Sensing and Imaging, 2018, Orlando, FL, United States

Abstract

Wedge or staircase micro-optics have become important components for building miniature optical spectrometers. These devices create spectral discrimination through interference between beams resulting from reflections at the surfaces of the optic. The literature has examples of low reflectance wedge spectrometer system where the Fourier transform is used to recover the spectrum (with no inherent bandwidth limit), and high-reflectance, band-limited simplex spectrometers where no data processing is required. Instruments in the first category tend to be for the thermal infrared range, and instruments in the second category are more often encountered in the visible band. This second category includes linear variable filters and discrete etalon staircases. Though in practice, the signal treatment for these two types of spectrometers is radically different, the underlying interference mechanism is identical. It follows, that a single signal processing algorithm must exist which correctly treats the two types of signals. We present a mathematical description of the signal model for such spectrometers. We show that in the case of spectrally uniform reflectance, the signal has a specific relationship to the spectrum’s Fourier transform. We cast the spectral recovery problem as a matrix inversion, and derive formulas for calculating the solution matrix. The solution matrix is shown to yield the exact spectrum when applied to modeled wedge spectrometer signals in both low and high reflectance cases.

Citation Download Citation

Michael K. Yetzbacher, Christopher W. Miller, and Michael J. DePrenger "An analytic method for spectrum recovery from wedge or staircase spectrometers ", Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 106570F (14 May 2018); https://doi.org/10.1117/12.2303980

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available