- Up to 130 kHz full-spectrum readout rate
- 2.0 – 5.0 µm bandwidth
- Fiber-coupled input
Mid-infrared (MIR) spectroscopy is used to analyze MIR light sources and, in both industry and research, for non-invasive characterisation of gasses, liquids and solids as well as characterisation of light sources. The NLIR 2.0 – 5.0 µm Spectrometer (S2050-400/S2050-130k) is based on a novel measurement scheme that upconverts the MIR light to near-visible light. Silicon-based near-visible light detectors are far superior to MIR light detectors in terms of detectivity, speed and noise. The NLIR upconversion technology therefore brings these attractive features, and the advantages that follow, to the MIR regime.
Both editions seen below have sensitivities at -80 dBm/nm or better, and the maximum full-spectrum readout rate is 130 kHz! The spectrometer hence enables characterization of light source and measuring spectral content from chemical processes with a time resolution of less than 10 µs.
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80 kHz READOUT
A super-continuum light source with a bandwidth of approx. 3.5 µm – 4.2 µm and a repetition rate of 40 kHz of 2 ns pulses was measured with 80 kHz full-spectrum readout rate. In the figure, (a) shows raw data of 12 ms data acquisition, (b) shows a zoom where every other readout is empty as expected from 40 kHz rep-rate and 80 kHz sampling, (c) shows 10 raw consecutive spectra. The fluctuations in the spectra is by far dominated by noise from the light source.
This measurement shows that the S2050-130k spectrometer can easily be used to characterize fast modulation of infrared lasers or other dynamic events.
A 30 W globar was used as light source for these transmission measurement of a 50 µm polystyrene (PS) film and a 800 µm polyethylene terephthalate (PET) film. The S2050-400 spectrometer was set to 20 ms exposure time and capturing just single shots. No averaging or smoothing has been applied to the data subsequently.
For plastic recognition or thickness analysis, much shorter exposure time, and therefore faster acquisition, can of course be tolerated with assistance of computer algorithms.
Optical coating transmission
A 30 W globar was used as light source for these transmission measurement of coated optical windows: a Ge bandpass filter (BPF) for 3.7 – 4.5 µm and a YAG mirror coated with high-reflection at 1064 nm and high-transmission at 2.1 -4.5 µm. The S2050-400 spectrometer was set to 20 ms exposure time and capturing just single shots. No averaging or smoothing has been applied to the data subsequently.
Such measurements are used for coating quality control or even production monitoring.
Fiber reflection probe
A fiber reflection probe is a single-bounce attenuated total reflection (ATR) crystal that has fiber-coupled input and output. In this measurement, light from a 30 W globar was coupled into the input fiber, and the output fiber was connected to the S2050-400 spectrometer. By first taking a reference with the ATR probe in air, the probe was subsequently inserted into water, propane-2-ol, and sunflower oil, respectively, producing these absorption plots. The measurements were single-shot at an exposure time of 100 ms, and a 4-pixel wide Gauss filter was scanned through the data for smoothing.
Free Spectrometer Software included
- Easy connect and use software included.
- Data live stream, external trigger mode, background capture, transmission view, data saving, etc.
- API for spectrometers in MATLAB and Python available upon request.