Compact fire infrared radiance spectral tracker (c-FIRST)

Abstract

Remote sensing and characterization of high temperature targets on the Earth's surface is required for many cross-disciplinary science investigations and applications including fire and volcano impacts on ecology, the carbon cycle, and atmospheric composition. For decades this research has been hindered by insufficient spatial resolution and/or detector saturation of satellite sensors operating at short and mid-infrared wavelengths (1-5μm) where the spectral radiance from high temperature (>800 K) surfaces is most significant. To address this critical need, the Jet Propulsion Laboratory and partnering institutions are developing a compact modular high dynamic range (HDR) multispectral imager concept, with the flexibility to operate in the short, mid-or long-wavelength infrared spectral bands.

Advanced detector performance from UV to IR with nanostructured antireflection coatings

“…Figure 8 shows the effect of the single-layer AR coating application in reducing the Fabry Perot oscillations, where these measurements focused on capturing oscillations with respect to wavelength involving use of a band pass filter over 6.8 µm to 12.4 µm. 1 Here substantial reductions in Fabry Perot oscillations are clearly observed following application of the nanostructured AR coatings, providing substantial performance improvement for the NASA IR sensing application.…”

“…High resolution imaging in infrared (IR) and ultraviolet (UV) bands has numerous applications in NASA space and commercial systems. [1][2][3] The performance of imaging sensor systems is limited by loss of incident signals from Fresnel reflection that occurs on both sides of optical components as well as from the front surfaces of imaging sensor arrays, which can be significantly large (above 30%) due to the high refractive index of substrates used for IR and UV detector arrays and optical systems of interest to NASA. Nanostructure-based antireflection (AR) coatings comprise a critical technology that can overcome this limitation and further improve detector/imaging system performance.…”

“…Impact of nanostructured ZnS LWIR AR coating in reducing Fabry Perot oscillations on NASA GaSb detector array devices. For these measurements a band pass filter from 6.8 µm to 12.4 µm was used 1.…”

Advanced nanostructured antireflection coatings for high performances IR detector and imaging applications

“…High resolution imaging in infrared (IR) and ultraviolet (UV) bands has numerous applications in NASA space and commercial systems. 1,2 The performance of imaging sensor systems is limited by loss of incident signals from Fresnel reflection that occurs on both sides of optical components as well as from the front surfaces of imaging sensor arrays, which can be very significant (above 30%) due to the high refractive index of substrates used for IR and UV detector arrays and optical systems of interest to NASA. The nanostructure-based antireflection (AR) coatings comprise a critical technology that can overcome this limitation and further improve detector/imaging system performance.…”

“…4 These step-graded coatings enable the formation of AR coating structures that combine broadband and omnidirectional performance characteristics. 5 Figure 1. (a) Schematic of experimental setup used for the physical vapor deposition (PVD) technique for growing nanostructured materials, where incident physical vapor flux strikes the sample at an angle θ relative to the surface normal.…”