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Miniaturization of a VNIR Hyperspectral Imager

机译：VNIR高光谱成像仪的小型化

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A new approach for the design and fabrication of a miniaturized Hyperspectral imager is described. A unique and compact instrument has been developed by taking advantage of light propagation within bonded solid blocks of fused silica. The resulting microHSI™ is a VNIR hyperspectral sensor capable of operating in the 400-1000 nm wavelength range developed, patented, and built by NovaSol. The microHSI spectrograph weighs 12.4 oz from slit input to camera output. The microHSI can accommodate either custom foreoptics or C-mount input lenses to adapt to a wide range of fields-of-view (FOV). The prototype microHSI uses a telecentric F2.8 foreoptic, with 36 mm focal length, to cover a 15 degree FOV. It can resolve 960 spatial pixels, resulting in a 280 μrad IFOV for this particular foreoptics implementation. With a 1 nm/unbinned pixel dispersion, the spectrometer spectral resolution is 3.5 nm. Results of field and laboratory testing of the prototype microHSI are presented and show that the sensor consistently meets technical performance predictions. The prototype microHSI employs a holographic diffraction grating embedded within the optical blocks resulting in al9% diffraction efficiency. Future units are anticipated to incorporate a blazed grating for improved throughput and SNR. The microHSI concept can be extended to operation over other wavelength regions. Designs are nearing completion for a SWIR version of the device, and a miniaturized LWIR microHSI sensor is currently at the conceptual design stage.
机译：描述了一种设计和制造小型化高光谱成像仪的新方法。通过利用光在熔融二氧化硅粘结固体块中的传播，开发了一种独特而紧凑的仪器。最终的microHSI™是VNIR高光谱传感器，能够在NovaSol开发，获得专利并制造的400-1000 nm波长范围内工作。从狭缝输入到摄像机输出，microHSI光谱仪的重量为12.4盎司。 microHSI可以容纳定制的光学元件或C型安装输入镜头，以适应各种视场（FOV）。 microHSI原型使用焦距为36 mm的远心F2.8镜头，可覆盖15度FOV。它可以解析960个空间像素，因此对于这种特定的光学实现而言，其IFOV为280μrad。在1 nm /未合并像素色散的情况下，光谱仪的光谱分辨率为3.5 nm。介绍了原型microHSI的现场和实验室测试结果，表明该传感器始终符合技术性能预测。 microHSI原型采用嵌入在光学模块内的全息衍射光栅，可实现9％的衍射效率。预计未来的设备将采用闪耀光栅，以提高吞吐量和SNR。 microHSI概念可以扩展到在其他波长区域上运行。该设备的SWIR版本的设计已接近完成，而小型LWIR microHSI传感器目前正处于概念设计阶段。

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