Residual fixed pattern noise and random telegraph signal noise of a MWIR T2SL focal plane array

International audienceStability over time has recently become a figure of merit of major importance to compare the performances of infrared focal plane arrays (FPA) of different technologies. Indeed, this parameter dictates how often the calibration of operational electro-optical systems has to be done, and thus reflects the availability of the system during an operational mission. The stability over time is generally estimated through fixed pattern noise (FPN) and residual fixed pattern noise (RFPN) measurements after a two-point correction. However, each laboratory or industrial has its own protocols and criteria, such that published results cannot be easily compared. Recent studies also showed that random telegraph signal (RTS) noise, which leads to flickering pixels, can strongly affect the image quality, so the question arises as to wether these RTS pixels have an effect on RFPN. In this paper, we describe our experimental protocol to evaluate the stability over time of an FPA and to count up/classify flickering pixels. We then present the results obtained on a T2SL MWIR Integrated Detector Dewar Cooler Assembly (IDDCA) provided by IRnova. Our measurements show that the stability over time of the T2SL MWIR IDDCA are excellent: first, in terms of FPN/RFPN; then, in terms of RTS noise with only a few blinking pixels. We also show that the RTS pixels having an effect on the RFPN are fully detected by the algorithm used to rule out defective pixels before calculating RFPN

MTF measurements of a type-II superlattice infrared focal plane array sealed in a cryocooler

International audienceIn operational electro-optical systems, infrared focal plane arrays (IR FPA) are integrated in cryocoolers which induce vibrations that may strongly affect their modulation transfer function (MTF). In this paper, we present the MTF measurement of an IR FPA sealed in its cryocooler. The method we use to measure the MTF decorrelates operational constraints and the technological limitations of the IR FPA. The bench is based on the diffraction properties of a continuously self imaging grating (CSIG). The 26 µm pixel size extracted from the MTF measurement is in good agreement with the expected value

Hyperspectral study of a 320 x 240 uncooled microbolometer array

Communication to : SPIE Optical Design and Testing, Saint-Etienne (France), 30 septembre - 3 octobre 2003SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.2004 n.13 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Media 2: SIELETERS, an airborne infrared dual-band spectro-imaging system for measurement of scene spectral signatures

Originally published in Optics Express on 15 June 2015 (oe-23-12-16164

Media 1: SIELETERS, an airborne infrared dual-band spectro-imaging system for measurement of scene spectral signatures

Originally published in Optics Express on 15 June 2015 (oe-23-12-16164

I suffer more from your pain when you act like me: Being imitated enhances affective responses to seeing someone else in pain

Item does not contain fulltextSocial-psychological research has suggested that being imitated changes the way that we experience others: We like someone who imitates us more, and the interaction with this person runs more smoothly. Whether being imitated also affects basic social reactions, such as empathy for pain, is an open question. Empathy for pain refers to the observation that perceiving another person in pain results in pain-related brain activation in the observer. The aim of the present study was to combine the two lines of research, to investigate whether being imitated can influence empathy for pain. To this end, we developed an experimental approach combining an imitation task with a pain perception task. Subjective reports, as well as physiological responses, indicated that being imitated enhances affective responses to seeing someone else in pain. Furthermore, using rubber hand illusion measures, we provided evidence for the role of shared representations in the sensory and motor domains as a core underlying mechanism. In this way, our study integrated social-psychological research on being imitated with cognitive research on empathy for pain. This has broad implications, since imitation plays a crucial role in our daily social interactions, and our study provides insights into a basic cognitive mechanism that might underlie these social situations