The STS introduces a family of compact, low-cost spectrometers that’s ideal for embedding into OEM devices. At just 40 mm x 42 mm x 24 mm (1.6” x 1.7” x 0.9”), the STS provides full spectral analysis with
low stray light (<0.2% SRPR @ 450 nm), high signal-to-noise ratio (>1500:1) and great optical resolution (~1.5 nm FWHM) – remarkable performance for a spectrometer its size. The STS is an especially attractive
option for high-intensity applications such as LED characterization and absorbance/transmission measurements, yet versatile enough for an extensive range of spectral sensing requirements.
Robust Optical Bench Design
At the heart of the STS is a CMOS detector in a crossed Czerny Turner optical bench. The bench is distinguished by custom-molded collimating and focusing mirrors and a 600 lines/mm groove density grating that projects spectra onto the detector. Special coating technology minimizes etalon effects. The unit achieves significantly better optical resolution and produces less stray light than most filter-based and other spectrometers of its size. For example, STS has 14-bit A/D resolution and has low power consumption of just 0.75 W. Plus, STS has triggering functions for instances when precise timing is necessary. For example, synchronizing measurements
with an external event, such as the pulsing of an excitation lamp for fluorescence, is no challenge for the STS.
STS takes advantage of recent advances in CMOS detectors that elevate optoelectronic performance and improve system reproducibility. It uses a 1024-element ELIS-1024 linear image sensor that’s responsive from 200-1100 nm and has excellent sensitivity (6.74V/lux-second typical). This new generation of CMOS detectors offers excellent performance with great value.
We offer STS models for 200-600 nm (STS-UV), 350-800 nm (STS-VIS) and 650-1100 nm (STS-NIR) applications. Each unit has a fixed optical bench configuration, although you can select from standard slit sizes of 10, 25, 100 and 200 μm. Custom slits are also available. To optimize signal collection efficiency and improve reproducibility, STS utilizes a fixed-fiber design. The fiber has a 400 μm core and is 2 cm in length (including SMA connector).
Custom configurations – including versions with different fiber lengths and with a cosine corrector – are available for high-volume applications.* The STS is fully operational with SpectraSuite spectroscopy software. Operating software and software development tools are priced separately.
Markets and Applications
The STS was conceived as a low-cost, high-performance spectrometer for OEM and high-volume applications where one or more wavelengths are being monitored and a highly reproducible result is required. Life sciences, medical diagnostics, solid state lighting and environmental analysis are among the industries where STS is an attractive alternative to filter-based optical sensing systems and other microspectrometers.
Typical spectral performance for the STS units