The Raspberry spegg 40 can detect a maximum spectral range from 200nm to 1900nm and emit a maximum of two coupled light sources (UV A-B-C LED and long-life bulb) in the range from 250nm to 2000nm. Two additional coupled LEDs can be used for fluorescence excitation of the sample.
For industrial applications, the reproducibility of the spectral measurement and the robustness and durability of the measuring device are crucial. For reproducibility of the spectral measurement from one measuring device to another and within the lifetime of the spectrometer, the entrance slit, the position of the grating, the mirrors and the detector must be the same. This is the only way to ensure that spectral evaluations, e.g. for determining certain analyte concentrations, can be transferred to other identical spectrometers.
The Raspberry spegg fulfills this requirement. Thanks to the monolithic design, the optical path is fixed over the entire service life. Each spectrometer is calibrated once after production and does not need to be recalibrated. This manufacturing process ensures that the spectra of all other Raspberry speggs are comparable. The calibration data for each Raspberry spegg is stored in the Flash C of the Micro Controller.
The spegg 40 has a predetermined breaking point with which the light source board can be separated from the spegg 40. The remaining spegg40 board can thus be accommodated in smaller housings. Mounting holes for the Raspberry zerro are integrated.
The data connection is then ensured by a ribbon cable (included in the scope of delivery).
For fluorescence excitation, the two LEDs can be selected from the central wavelengths 285 nm, 305 nm, 320 nm, 365 nm and 375 nm. Like the LEDs, the long-life bulb has an average service life of 40,000 hours. Power is supplied via a 5V connection. This can be provided externally or via the spegg 40 board (cable is included). The power supply of the light source board, coupled with the spegg 40 board, is temperature-monitored. If the temperature of the SMA connection rises above 70 °C, the power supply to the light source board is switched off.
The demo software is written in Python and can be adapted to individual requirements. Various experimental sequences can be freely programmed. Absorption, transmission and the inclusion of external light sources with various filter options are possible with the demo software.
Scope of delivery:
SD card incl. Demo Software in Python
Specification: NIR Modul:
| Spectral Range | 1.7 version: 900 – 1700 nm |
| 1.9 version: 1000 – 1900 nm | |
| Fiber | Ø 300 / 330 µm; NA= 0,22 |
| Fiber length from module to fiber end | 32 mm to 1.450 mm, tolerance (+0 / -20) mm |
| Fiber connetion | male SMA 905 or 2,5mm Ferrule |
| Detector | InGaAs 256 pixels |
| Stray light attenuation | > 20dB LWP 1200 ; SWP 1900, |
| Spectral Resolution | Typ. 10 nmFWHM / 4.1 nmPixel |
| Spectral Accuracy: | < 2nm |
| Sensitivity | > 150 E12 cts x nm / Ws at 1500 nm |
| Dynamic Range: | > 5.000 ;low signal |
| Elektronic A/D resolution; connection; speed | 16 bit; UART; 115200 or 1MHz |
| storage temperature | – 40°C to +60°C |
| work temperatur | 0°C to +40°C |
| Max. rel. humidity | 85 % |
Specification: UVVIS Modul:
| Spectral Range | 200 – 1050 nm (250 – 1050 nm accessible) |
| Fiber | Ø 300 / 330 µm; NA= 0,22 |
| Fiber length from module to fiber end | 32 mm to 1.450 mm, tolerance (+0 / -20) mm |
| Fiber connetion | male SMA 905 or 2,5mm Ferrule |
| Detector | SCMOS |
| Stray light attenuation | > 17dB with GG495 at 470 nm (30 dB using SC30) |
| Spectral Resolution | < 10 nm FWHM / 2 nmPixel |
| Spektrale Genauigkeit | 2 nm (typ. 1 nm) |
| Inter Instrument Agr. | typ. 0,5 nm |
| Sensitivity (e.g. 500nm) | > 20*1015 cts*nm / W*s |
| Rauschen | 3 pW 500nm; Ti 1s low signal and 50pW with high signal |
| Dynamic Range: | > 5.000 ;low signal |
| Elektronic A/D resolution; connection; speed | 16 bit; UART; 115200 or 1MHz |
| storage temperature | – 40°C to +60°C |
| work temperatur | 0°C to +40°C |
| Max. rel. humidity | 85 % |