Measuring the Dark Signal

This section describes how to measure the dark signal on the SensorControl software.

The dark signal refers to the baseline signal that the sensor electronics generate. This baseline signal varies according to, for example, the sensor temperature or measurement settings and setup.

To obtain better results, we want to remove this sensor effect, and only measure the actual light reflected from the target. To this end, we must store the dark signal form the sensor, as a dark signal.

Always measure the dark signal at the start of a new set of measurements.

There are two options for measuring the dark signal:

  • Automatic mode. Automatic mode is only available when using NIRONE sensor with reflection optics and the integrated light source. Set the Lamp Mode in the SETTINGS Tab to Auto lamp with dark substraction. The unit will now automatically measure a new dark signal each time before measuring a new sample spectrum. This will effectively double the measurement time for each spectrum.

    See also SETTINGS.

  • Manual mode, and Auto Lamp Mode. See the instructions below.

Proceed as follows:

  1. Select SETTINGS, and set the desired Measurement settings.
  2. Press the UPDATE button.
  3. Place the sensor in such a way that it points up to the air.
  4. On SensorControl, select DARK.
    Figure 1: DARK Button Inactive
    DARK Button Inactive
  5. Allow the measurement to run.

    While the measurement runs, the DARK button is white.

    Figure 2: Dark Signal Being Measured
    Dark Signal Being Measured
  6. Wait until the measurement is over and the DARK button turns green.
    Figure 3: Dark Signal Measured
    Dark Signal Measured

    Clicking on this button after the dark signal has been measured, forces the software to unload the dark signal value, so that you can measure a new dark signal.