Spectra 1 part1/2/2024 ![]() Figure 4 shows the 10 nm band, the 2 nm band, the 20 nm band and a distorted 100 nm band along with a reduced noise signal for fourth derivative with a gap of 19. Figure 3 shows the 10 nm band, the 2 nm band and the 20 nm band with smaller random noise for a fourth derivative with a gap of nine. This small gap derivative shows the 2 nm absorber and the random noise. Please note that the 100 nm spectrum has been divided by 20 for plotting.įigure 2 shows the spectrum extracted from the five-sum spectrum with a fourth derivative using Unscrambler 9.8 with a gap of one. The sum of these five spectra is shown in the same figure. However, to understand fourth derivative spectra I suggest starting with computer-generated spectra with defined bandwidths and amplitudes to learn what the fourth derivative does to spectra.įigure 1 shows four spectra with bandwidths of 2 nm, 10 nm, 20 nm and 100 nm, plus a random noise spectrum to simulate instrument noise. I have decided that the fourth derivative with different gap sizes is the best. ![]() Like Tony, I also like to look at spectra in great detail, and I have been searching for the best tool for such observations. H = Gap + 1 Calculation of fourth derivative Unscrambler 9.8 from Camo which allows a Gap choice such that.Vision software from Foss NIRSystems which includes a segment and does not divide by the square of ( h).Norris, in Lab-Calc™ which uses the above formula. We have tested three different computer programs for computing the fourth derivative of an NIR spectrum and the result is different for each. We define the fourth derivative spectrum as the second derivative of a second derivative spectrum. The size of the gap ( h) has a very useful effect on the derivative. Note that ( h) must be greater than zero. Software: Win XP and Vista based, USB 2.\ The software is offered in multilanguage version (ENG, GER, FR, RU, SK) and is compatible with Win XP, Vista, W7, W8, W8.1.ĭetector: 1/3.5" Colour CMOS Sensor, 1.3M, 1280x1024įrequency: up to 15 spectra per second (1280x1024) Several toolbars allow setting of the spectrometer parameters, so they fit precisely to requirements of the experiment. ![]() The spectrum can be exported in graphic form for easy publication, or in text form (raw data) for more advanced scientist's calculations. For easier interpretation of the spectrum, every wave band is marked with corresponding colour. Software for data collection has intuitive interface with clear real time graphics output. Just plug it into computer and start your experiment! Specially selected transmitive grating with fine trimmed entrance slit is a guarantee of the high resolution and good reliability of the results. ![]() ![]() Data side is connected to the PC by USB 2.0 interface. Connection to any of your experiments cannot be easier. Optical signal enters the device through the open area or flexible optic fiber. The spectrometer is equipped with all the components necessary to do precise measurement from the entrance slit through the grating to the detector. Construction of the device is solid enough to withstand the rough handling in the student's labs. SPECTRA spectrometers are designed to effectively examine the visual part of the spectrum (from 360 nm to 940 nm), with sufficient sensitivity, covering a wide range of experiments. Spectrometers SPECTRA produced by Kvant are easy to use, educational spectrometer ideal for general measurement at schools, yet accessible at very good value. ![]()
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