Sensitive Hadamard transform imaging spectrometer with a simple MEMS

Andreas Wuttig; Rainer Riesenberg

doi:10.1117/12.463016

8 April 2003 Sensitive Hadamard transform imaging spectrometer with a simple MEMS

Andreas Wuttig, Rainer Riesenberg

Proceedings Volume 4881, Sensors, Systems, and Next-Generation Satellites VI; (2003) https://doi.org/10.1117/12.463016
Event: International Symposium on Remote Sensing, 2002, Crete, Greece

Abstract

A hyperspectral Hadamard transform imager is presented. It is based on a flat field spectrometer and a spatial light modulator. Compared to a typical dispersive pushbroom imaging spectrometer, the signal-to-noise-ratio can be increased by 1 ... 2 orders of magnitude for typical dimensions of the hyperspectral data cube. Applicable spatial light modulators include individually addressable MEMS based light modulators such as micro mirrors or newly developed micro shutters as well as mechanical slit positioning systems which are characterized by a fixed, movable pattern. In contrast to the individually addressable devices, the number of operational modes of the slit positioning system is constrained by the mask design, but high pixel numbers and high optical quality can be achieved by a mature and relatively simple micro machining technology. A detailed analysis of the relative performance of hyperspectral Hadamard transform, Fourier transform and hypothetical optimal imaging spectrometers with particular respect to the dimensions of the hyperspectral data cube and the composition of the detector noise reveals a considerable signal-to-noise advantage of the Hadamard transform imaging spectrometer over the Fourier transform imaging spectrometer for domination of read noise and a large number of spectral bands. In case the noise is dominated by dark current noise, the Hadamard transform imaging spectrometer can achieve 50% of the maximum possible sensitivity which is given by the hypothetical optimal imaging spectrometer. In contrast to the Fourier transform imaging spectrometer, the Hadamard transform imaging spectrometer is also suitable for use with short wavelengths.

Citation Download Citation

Andreas Wuttig and Rainer Riesenberg "Sensitive Hadamard transform imaging spectrometer with a simple MEMS", Proc. SPIE 4881, Sensors, Systems, and Next-Generation Satellites VI, (8 April 2003); https://doi.org/10.1117/12.463016

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