No-moving parts spectrometer based on a thin film IR line sensor with a linear variable filter grating. Robust and resistant to vibration and temperature changes. Can be designed to provide high spectral resolution over almost any part of the IR spectrum, by tuning the LVF grating to a specific wavelength range, and using Pyreos’ 128, 255 or 510 sensor element line arrays. Can be connected to a Windows PC via USB cable. Available in transmission and ATR versions.