Spectroradiometer BiTec sensor BTS2048-UV-S-WP for high-quality outdoor UV measurements The BTS2048-UV-S-WP is a high-quality spectroradiometer whose compact design and elaborate optical, electronic and mechanical interfaces make it ideal for high precision outdoor UV measurements. Due to its innovative filter and spectrometer design it is able to measure solar radiation with a very good straylight reduction performance. Accordingly, even the edge of the sun below 300 nm can be resolved for some orders of magnitude (see figure 2). With the included S-BTS2048 application software, precise measurements and data analysis (Erythema, ICNRIP, etc.) can be performed intuitively. In addition, the spectral range can be extended from the UV to the NIR with the complementary BTS2048-VL-TEC-WP. Applications in the whole Si spectral region (e.g. solar-cells) are possible. BiTec sensor for high-end light measurement One of the outstanding features of this exceptional spectroradiometer is its BiTec sensor. It combines the special properties of a photodiode with those of a back-thinned CCD diode array. Through bilateral correction of measurement signals from both sensors, the BiTec sensor ensures precise radiometric and spectral-radiometric measurement values over a large dynamic range. Spectrometer based on a high-quality back-thinned CCD detector The spectrometer unit is based on a CCD with usable spectral responsivity range between 190 nm and 430 nm. It has a 0.7 nm optical bandwidth and a pixel resolution of 0.13 nm/pixel. Due to the back-thinned technology, the CCD is substantially more sensitive as compared to conventional front-illuminated CCD chips. Furthermore, the CCD is one stage cooled (1TEC) to reduce the dark current and and thereby increase the signal to noise ratio. Precise spectral radiometry (low straylight) To facilitate optimum use of the CCD sensor's dynamic range and to overcome the problems of most array specto-radiometers in the UV range, a remote-controlled filter wheel (open, closed, optical filters) is located in the optical beam path. This filters combined with smart measurement and stray light correction routines enables high quality measurements of the BTS2048-UV-S. Results are comparable with double monochromator results (see figure). However, the measurement duration is significantly lower. Since the BTS2048-UV-S contains a filter wheel with 8 filter positions, a futher smart measurement Comparison of a solar measurement of the BTS2048-UV-S and a standard double monochromator. The BTS2048-UV-S achieves about the same quality in a measurement time of a few s compared to about 1.5 min of the double monochromator. • Peak wavelength • Center wavelength • Centroid wavelength

■ Spectroradiometer sensor BTS2048-UV-S-WP routine for stray light reduction is implemented compared to the BTS2048-UV. WP means weather proof The housing of the BTS2048-UV-S-WP is designed for outdoor measurements. The cooled back-thinned CCD and the spectrometer unit are temperature controlled in a second housing. In this housing, humidity is removed by an exchangeable cartridge. In order to avoid deposits of dust, rain or snow on the entrance optics on the entrance optics the quartz dome is blow-dried by warm air. Diffuser window directly connected instead of light guide As for the input optics,...

■ Spectroradiometer sensor BTS2048-UV-S-WP ● Numerical display fields for radiometric, spectral and other measurands. User software with flexible desktop structure The BTS2048-UV-S-WP‘s scope of delivery includes the S-BTS2048 user software. One of the characteristic features it has to offer is the flexible desktop that can be individually configured by the user. ● Measurement protocol of the selected measurement parameters. ● Spectrum. Zoom function. This entails a potpourri of graphical and numerical display windows from which the user can choose: ● Data logger. Zoom function. ● Freely definable...

Interface Data transfer Trigger Temperature range Temperature stability IP class 32bit for device control,16bit for CCD array control, 8bit for photodiode control Standard for 2048 float array values via ethernet 7ms, via USB 2.0 140 ms Trigger input incorporated (different options, rising/falling edge, delayed, etc.) Optional software development kit S-SDK-BTS2048 for user software setups based on .dll's in C, C++,C# or in LabView. Diameter: 160 mm; Height: 222 mm (see detailed drawing) Storage: (-10 to 50) °C; Operation: (-25 to 50) °C *3 inside WP housing (electronics): < ± 1 °C; CCD Chip:...