Signal-to-noise Ratio of hyper-spectral imaging FTIR interferometer system plays a decisive role on the performance of the instrument. It is necessary to analyze them in the development process. Based on the simplified target/background model, the energy transfer model of the LWIR hyper-spectral imaging interferometer has been discussed. The noise equivalent spectral radiance (NESR) and its influencing factors of the interferometer system was analyzed, and the signal-to-noise(SNR) was calculated by using the properties of NESR and incident radiance. In a typical application environment, using standard atmospheric model of USA(1976 COESA) as a background, and set a reasonable target/background temperature difference, and take Michelson spatial modulation Fourier Transform interferometer as an example, the paper had calculated the NESR and the SNR of the interferometer system which using the commercially LWIR cooled FPA and UFPA detector. The system noise sources of the instrument were also analyzed in the paper. The results of those analyses can be used to optimize and pre-estimate the performance of the interferometer system, and analysis the applicable conditions of use different detectors. It has important guiding significance for the LWIR interferometer spectrometer design.
The concept of high-throughput imaging Fourier transform spectrometer is introduced. Starting from the principle of the lateral shearing interferometer, it analyses the decline reason for the signal modulation efficiency and theoretically analyses the several aspects of the surface errors of the plane mirror, the beamsplitter properties change and the incident light angle influence the modulation efficiency. Based on analysis results, some expressions of modulation efficiency are provided. Furthermore, the relationship between modulation efficiency and performance parameters is pointed out. The reasons for the interferometer signal modulation efficiency decline can contain the following several aspects: (1) the influence of the surface errors of the plane mirror, (2) the polarization state change because of the influence of the reflection and the transmission in the light incident process makes the signal modulation efficiency decline, (3) the influence of the incident light angle. The results show that: this class of system is inherently optomechanics robust, no-moving part system, simple and compact structure, easy assembly and adjustment, strong vibration resistance as well as high resolution and high-throughput. Our results will provide a theoretical and practical guide for studying, developing and engineering Michelson lateral shearing interference imaging spectrometers. It can be widely used in the long-wave infrared (LWIR) imaging spectrometer system for thermal infrared remote sensing community.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.