NASA SBIR 2004 Phase I Solicitation E1 Instruments for Earth Science Measurements NASA's Earth Science Enterprise (ESE) is studying how our global environment is changing. Using the unique perspective available from space and airborne platforms, NASA is observing, documenting, and assessing large- scale environmental processes with emphasis on atmospheric composition, climate, carbon cycle and ecosystems, the Earth’s surface and interior, the water and energy cycles, and weather. A major objective of the ESE instrument development programs is to implement science measurement capabilities with small or more affordable spacecraft so development programs can meet multiple mission needs and therefore, make the best use of limited resources. The rapid development of small, low cost remote sensing and in situ instruments is essential to achieving this objective. Consequently, the objective of the Instruments for Earth Science Measurements SBIR topic is to develop and demonstrate instrument component and subsystem technologies that reduce the risk, cost, size, and development time of Earth observing instruments, and enable new Earth observation measurements. The following subtopics are concomitant with this objective and are organized by measurement technique. Subtopics E1.01 Passive Optics Lead Center: LaRC Participating Center(s): ARC, GSFC The following technologies are of interest to NASA in the remote sensing subtopic “passive optics.” Passive optical remote sensing generally requires that deployed devices have large apertures and large throughput. NASA is interested primarily in instrument technologies suitable for aircraft or space flight platforms, and these inherently also prefer low mass, low power, fast measurement times, and a high degree of robustness to survive vibrations in flight or at launch. Wavelengths of interest range from ultraviolet through the far infrared. Development of techniques, components and instrument concepts that can be developed for use in actual deployed devices and systems within the next few years is highly encouraged. Technologies and components that are not clearly suitable for use in high throughput remote sensing instruments are not applicable to this subtopic. Technical and scientific leads at NASA have given careful consideration to the Page 1 of 13 technology areas described below, and responses are solicited for these topics. 1) Stiff actuator technology designed to produce precisely controlled motion of large (> 1.0 cm diameter) optical elements intended for use in tunable Fabry-Perot and Fourier Transform Spectrometer (FTS) instruments. Motion ranges of particular interest include 20–60 µm, 1–2 mm, and 3–5 cm. Techniques applicable to very cold temperature ( 2) Technology leading to significant improvements in capability of large format (> 1 inch diameter), very narrow band (-1 full-width at half-maximum ), polarization insensitive, high throughput infrared (0.7–15 µm) optical filters. 3) Large format (> 1 inch diameter) high-transmission far infrared filters. Technology and techniques leading to filters operating at wave numbers between 500 and 5 cm-1 with FWHM less than 2 cm-1 are of immediate interest, though technology leading to very high transmission edge filters (long and short pass) is also solicited. The filters must be capable of operating in a vacuum at cryogenic temperatures. 4) High performance four-band two-dimensional (2-D) arrays (128x128 elements) in the 0.4 – 2.5 µm wavelength range with high quantum efficiencies (60%–80% or higher) in all spectral bands, low noise, and ambient temperature operation. E1.02 Lidar Remote Sensing Lead Center: LaRC Participating Center(s): GSFC High spatial resolution, high accuracy measurements of atmospheric parameters from ground-based, airborne, and spaceborne platforms require advances in the state-of-the-art lidar technology with emphasis on compactness, reliability, efficiency, low weight, and high performance. Innovative technologies that can expand current measurement capabilities to airborne, spaceborne, or Unmanned Aerial Vehicle (UAV) platforms are particularly desirable. Development of techniques, components, and instrument concepts that can be used in actual deployed systems within the next few years is highly encouraged. Technologies and components that are not clearly suitable for effective lidar remote sensing or field deployment are not applicable to this subtopic. This subtopic considers components, subsystems, and complete instrument packages addressing the following specific measurement needs: Molecular species (ozone, water vapor, and carbon dioxide); Cloud and aerosols with emphasis on aerosol optical properties; Page 2 of 13 Wind profiles using direct-detection lidar, or coherent-detection (heterodyne) lidar, or both; and Land topography (vegetation, ice, and land use). In addition to instrument systems, innovative component technologies that directly address the measurement needs above will be considered. Technical and scientific leads at NASA have given careful consideration to the component technologies described below, and responses are solicited for these technology areas. 1. Novel laser materials and components for high efficiency solid state lasers operating at 1 and 2 µm wavelength regions. The laser components include: Rugged, compact fiber lasers and fiber amplifiers for use at 1.5 and 1 µm; Low voltage ( Efficient and reliable high power, quasi-CW, pump diodes operating at 792 nm and 808 nm in fiber-coupled or free-space configuration; and Laser crystals for generating 2 µm radiation with high thermal conductivity and small variation of the index of refraction with temperature. 2. High damage-resistant, efficient, inorganic and birefringent nonlinear optical materials for generation of ultraviolet and mid-infrared radiation. 3. Thermally efficient conductively-cooled head for solid-state lasers with side-pumped rod configuration, and thermally and mechanically stable optical bench. 4. Frequency-agile, semiconductor lasers operating in 1 to 2 µm wavelength region with spectral linewidth less than 200 kHz over 1 ms and optical power greater than 20 mW. 5. Scanning or scanable lightweight telescopes with an optical quality better than 1/6 wave at 632 nm, mass density less than 12 kg/m2, and aperture diameters from 0.5–1.0 m. 6. Laser beam steering and scanning technologies operating at 0.355, 1.06, or 2.05 µm with 5–25 cm aperture diameter for airborne and 0.5–1.0 m for spaceborne instruments, meeting the following minimum requirements: 60° field of regard 90% optical throughput wave single pass optical quality at 632 nm 7. Shared aperture angle-multiplexed holographic or diffractive optical elements having several fields of view, each Page 3 of 13 with angular resolution of 50 µrad or better for the Nd:YAG or Nd:YLF laser harmonics, and diffraction limited resolution for the Ho:YLF fundamental wavelength. Wide, flat, focal planes with low off-axis aberrations is of importance to terrain and vegetation mapping lidar applications. Hybrid designs using both 2053 nm or 1064 nm and 355 nm simultaneously are needed for dual wavelength Doppler wind lidar applications. Materials and technologies are needed that can be scaled up to 1 m apertures and larger, and space qualified. Designs using lightweight materials, such as composites or membranes and deployable folded architectures, are also desired to decrease system size and weight. 8. High gain, low noise photon counting detectors that operate without the use of cryogens are needed. Other desirable properties are linearity over a large dynamic range, saturation count rates over 100 MHz, reasonable active area size (>200 µm), 250–2200 nm response wavelengths, and high clocking and readout rates with low read noise. High-speed (500 Msamples per second or greater) waveform digitizers are also of interest for operation with integrated pulse-finding capability suitable for continuous operation and capable of locating more than 200,000 individual pulses per second. 9. Narrow band optical filters with 75% throughput, with minimum 1 inch clear aperture. E1.03 In Situ Sensors Lead Center: GSFC Participating Center(s): ARC, JPL Proposals are sought for the development of in situ measurement systems that will enhance the scientific and commercial utility of data products from the Earth Science Enterprise program and that will enable the development of new products of interest to commercial and governmental entities around the world. Technology innovation areas of interest include: Autonomous Global Positioning System (GPS)-located platforms (fixed or moving) to measure and transmit to remote terminals upper ocean and lower atmosphere properties including temperature, salinity, momentum, light, precipitation, and biogeochemistry. Dynamic stabilization systems for small instruments mounted on moving platforms (e.g., buoys and boats) to maintain vertical and horizontal alignment. Systems capable of maintaining a specified pointing with respect to the Sun are preferred. Small, lightweight instruments for measuring clouds, liquid water, or ice content (mass) designed for use on radiosondes, dropsondes, aerosondes, tethered balloons, or kites. Wide-band microwave radiometers capable of high-speed characterization of cloud parameters, including liquid and ice phase precipitation, which can operate in harsh environmental conditions (e.g., onboard ships and aircraft). Autonomous GPS-located airborne sensors that remotely sense atmospheric wind profiles in the troposphere and