This paper introduces China��s first field imaging spectrometer, FISS. Its imaging principles, structural design, and main parameters are described. Spectral and radiometric calibration were performed always find useful information in the precision optical laboratory of the Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. The sensor��s signal to noise ratio (SNR) was also precisely measured. This work will be of crucial importance in boosting the development of field imaging spectroscopy in China.2.?FISS System Overview2.1. Basic Design PrinciplesThe FISS development process drew inspiration from that of the PHI. We focused on improvement or redesign of the imaging system, optical splitting system, and control software.

The imaging system is similar to that of PHI [4,35]; Inhibitors,Modulators,Libraries the direction along the slit forms a spatial line image, while that perpendicular to the slit measures the spectrum for each line pixel made by the dispersion component. A second spatial dimension is covered by the scanning mirror.Figure 1 shows the imaging principle of the FISS. The front optics Inhibitors,Modulators,Libraries image the object line onto the entrance slit plate, and then successively pass light through a collimating mirror, a dispersing unit in which the incident radiation is spread according to its wavelength in the vertical direction. Finally, a collective lens forms an image on the CCD chip. In the image, the spectra of the object line are represented by values found in the rows (parallel to the slit, called the spatial axis), while radiation within a narrow spectral band received from the line is found in the columns (dispersion direction, called the spectral axis).

For each object line, the CCD can generate a spectral-spatial image, and together with the pendulum sweeping of the scan mirror within a certain angle and record rate, spectral data can be recorded continuously. The result is an image cube, as shown Inhibitors,Modulators,Libraries in Figure 2.Figure 1.Basic principle Inhibitors,Modulators,Libraries of the FISS instrument.Figure 2.Vegetation image cube acquired by the FISS. The hyperspectral image was taken by FISS fixed in an elevated car, which was located 30 m above a wheat field in the Xiaotangshan National Demonstration Anacetrapib Base for Precision Agriculture Research, Beijing, China. …2.2. Structural DesignThe FISS consists of three main parts: the computer subsystem, the optomechanical subsystem, and the electronic subsystem. To achieve high performance, all three subsystems are important. However, the essential part of FISS is the optomechanical subsystem, which incorporates the scan mirror, an objective lens, a dispersing unit, and a CCD camera. Therefore, it performs scanning, imaging, dispersion, photoelectric conversion, A/D conversion, and selleck chemicals Afatinib other important functions.