Professionally, I have provided consulting services for remote sensing instrument design, calibration, operation, and subsequent data analysis and intellectual property development. I have hands-on experience with infrared sensor design and characterization, particularly those using HgCdTe focal plane arrays, and also have experience in reducing and analyzing radar data. Specifically, I provide advice regarding dynamic scene projection, non-uniformity correction, and calibration techniques. I have also provided software in support of the Miniature Thermal Emission Spectrometer (Mini-TES) instrument on-board the Mars Exploration Rover spacecraft. If you are interested in contacting me or learning more, feel free to use the form in the Contact Me section of this web-page.
From May 2004 to July 2010 I was funded as a remote software consultant to update and maintain the Mini-TES to Camera Co-Registration Toolkit (MMCC), a software package initially created during my Masters research at Cornell University and further developed during employment at JPL during the Mars Exploration Rover primary mission. This software, developed in IDL, was critical to the operation of the Miniature Thermal Emission Spectrometer (Mini-TES). MMCC used image mosiacs and terrain meshes from the Panoramic Camera and Navigation Camera instruments to allow graphical selection of Mini-TES targets and output formatted commands which could be uploaded to the spacecraft. The project required solving camera model parameters and relative sensor positions using data obtained during spacecraft assembly and calibration and JPL in order to accurately register information between instruments on each rover. In addition to mission planning, the software also provided various capabilities for data analysis using standard image processing techniques to interpolate and project Mini-TES spectral abundance maps onto visible camera mosaics.
From September 2006 to September 2007 I provided consulting services for MIT Lincoln Laboratory (MIT LL). These services were an extension of work performed during employment at the laboratory and in-part meant to help with personnel transition. Between May 2004 and September 2006 I worked at MIT LL as the research manager of an infrared sensor test and emulation laboratory known as the Seeker Experimental System (SES). SES is a secure facility used to support various programs which utilize ballistic missile defense seekers, airborne sensor platforms, satellites, and tactical air defense sensors. Laboratory assets include standard infrared test and evaluation hardware in addition to resistive-array based scene projection capabilities, which allow for hardware-in-the-loop testing of sensor systems. Units under test could be analyzed in a cryogenic chamber, capable of simulating a space background, or in an ambient environment using a number of specially configured optical testing stations.
non-uniformity correction techniques for resistive array scene projectors. These techniques increased the radiometric accuracy of the projection devices so that they could be used to validate current seeker technology. Previously, radiometric inaccuracies in the projected scenes were larger than the expected error in the seeker's themselves, limiting the technology's usefulness in testing the current generation of infrared sensors.
Below, you can see an annotated graphic of a simple diode IV curve. The graphic shows how a flux-dependent non-linearity can arise from inadequate bias voltage, especially if the biasing load line has any current dependence. Experiments performed on long-wave sensors in SES have shown that this effect results in a total photocurrent dependent non-linearity in sensor responsivity; the responsivity of a single detector pixel is a function of the total incident flux impinging on the array. This effect will have impact on sensor design for systems used to support high flux applications and is especially important for systems which observe both point source and resolved targets. This type of non-linearity is a generic property of most long-wave focal plane arrays and suggests that calibration techniques should include targets of varying size which will characterize the total photocurrent dependence of sensor response.