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The DEMON is a spectral high-resolution Double Echelle MONochromator. It consists of an optomechanically motorized and thermally robust echelle spectrometer in sequence with a prism monochromator that is used for the selection of the inspection range. The patented optical design of prism and echelle grating is arranged in Littrow configuration and benefits from the high image quality of the applied parabolic mirror optics. The width of the prism monochromator exit slit, which serves also as entrance slit of the echelle spectrometer, is adjustable. An active wavelength stabilization is provided by using the internal calibration lamp for highest absolute wavelength accuracy without the necessity of extensive temperature stabilization.
By applying reflection optics with broadband UV layers and a CaF2 prism, chromatic aberrations are avoided and thus a large wavelength range from the UV to the NIR is provided. The light coupling into the DEMON spectrometer is realized via SMA fiber or reflection transfer optics. Various CCD, ICCD and InGaAs cameras are suitable for the designed detection area.
The supplied operating software Sophi with optional LabVIEW library for complete remote control of the DEMON allows fully access of all spectrometer-detector functions via graphic user interface and provides automated measurement routines with an integrated scripting language. All measured spectra are automatically plotted for comprehensive analysis that can easily be performed with Sophi.
MODELS
| Model | DEMON | DEMON-NIR | SUPER DEMON |
|---|---|---|---|
| Optical design | echelle spectrometer with pre-monochromator and active wavelength stabilization in Littrow-configuration | ||
| Aperture | f/10 | f/20 | |
| Slit width | adjustable | ||
| Wavelength range | 190-900 nm (more on request) | 600-1,700 nm | 200-750 nm |
| Spectral resolving power λ/min measurable FWHM | 75,000 (150,000 possible) | 60,000 | 200,000 |
| Spectral resolution | 2.5-12 pm | 10-28 pm | 1-3.75 pm |
| Absolute accuracy | spectral resolution / 4 | pixel dispersion x 10 pixel | spectral resolution / 4 |
| Simultaneous inspection range | 1-5 nm | 4.5-13.5 nm | 0.25-1 nm |
| Linear dispersion* | λ / 225,000 | λ / 180,000 | λ / 600,000 |
| Detector | CCD or ICCD | InGaAs | CCD or ICCD |
| Exposure time, min. | 1 ms with CCD; 1 ms with InGaAs; 5 ns with ICCD | ||
| Dynamic range | 16 bit | ||
| Light coupling | UV fiber down to 190 nm or mirror optics down to 175 nm | ||
| Wavelength calibration | with calibration lamp | ||
| Control | automatic control of the motors and the calibration lamps via PC | ||
| Software | Sophi, LabVIEW library optional | ||
| Dimensions without detector (L x W x H) | (600 x 310 x 230) mm | (1215 x 512 x 300) mm | |
| Weight without detector | 25 kg | 75 kg | |
| Features | integrated mechanical shutter and motorized slit | ||
* Values apply for a CCD with 1,024 pixels and a pixel size of 13.5 µm
Other spectral resolutions and wavelength ranges on request
Subject to technical changes without notice
APPLICATIONS
u Precise absolute wavelength determination of emission lines
u Quality control of diode and solid-state lasers
u Spectrometric process control
u ICP-OES
u MIP-OES