What is thermal wavelength stability in spectrometers?
Stability is a broad term that encompasses various elements of the spectrometer system, including the optical bench, electronics and light source. More specifically, thermal wavelength stability in spectrometers is a measure of the change in specifications (performance) at various temperatures; thermal stability is typically expressed in pixels per °C for a passive device or as +/- °C per setpoint temperature with an active device.
Ocean Optics provides three primary options for maintaining thermal stability in spectrometers:
- Temperature Controllers are active devices for controlling temperature. Our SteadiQ spectrometer chamber, which regulates the environment temperature; and the thermoelectric coolers that typically regulate detector temperature in certain spectrometers.
- In Passive Temperature Stabilization, the spectrometer’s athermal design promotes stability. For example, Torus has an optical bench design that minimizes temperature-related instability.
- The Procedural Approach uses experiment controls to mitigate the effects of temperature variation. Examples include taking frequent reference and dark measurements, integrating reference monitoring into the procedure and using electrical dark correction.