Continuously update white reference based on the dark reference

By continuously updating the white reference based on the dark reference accuracy and speed improves in continuous measurement streams.

The checkbox Continuously update white reference based on the dark reference is found on the References tab of Workspace Settingsunder Advanced. Learn more in Dark and White References.

This option changes how white references are handled and can greatly improve long-term accuracy in continuous measurements.

• When enabled: The white reference intensity is saved in a separate file. During real-time measurement, the most recent dark reference is used along with the saved white reference intensity to calculate the final result. This improves accuracy, especially in continuous measurement streams where it is faster to acquire new dark references (if the camera has a shutter). The formula used is

  • is the raw signal value

  • is the most recent dark reference

  • is the saved white reference intensity

• When disabled: The white reference is stored as , and the calculation involves both the old and new dark references. This mode is suitable for applications that do not rely on real-time white reference adjustments. The formula applied is:

  • the raw signal value

  • is the most recent dark reference

  • is the stored dark reference

  • is the saved white reference intensity

For fixed-length new measurements, both a new dark reference and white reference are taken by default, making the Continuously update white reference based on the dark reference option unnecessary. However, in continuous measurement streams, using White Reference Intensity increases measurement speed and accuracy