Ibsen’s PEBBLE VIS-NIR spectrometer is an addition to the PEBBLE platform of ultra-compact spectrometers with a form factor of only 20 × 15 × 8 mm, high resolution and sensitivity, as well as environmental ruggedness. PEBBLE VIS-NIR is based on the same diffraction grating technology used in all other Ibsen spectrometers. This ensures that PEBBLE can be manufactured in high quantities with very small unit-to-unit performance variation. The core of PEBBLE is a transmission grating manufactured in-house. Furthermore, PEBBLE utilises a fast and very sensitive CMOS detector array with 256 pixels. When combined with a large numerical aperture of 0.22 (low f-number of f/2.2) PEBBLE provides high sensitivity for such a small spectrometer.
A key benefit of using a transmission grating inside PEBBLE is a high resolution of 8 nm across the full 500–1100 nm wavelength range. Furthermore, the pure transmission-based optics inside PEBBLE ensures very good thermal stability and makes it ideal for real-time measurements in the field.
