Linearisation and Calibration
The linearisation is a set of values that should never change. The only case where this may change is when an IR emitter has faulted and the new heat signature from the new emitter is different from the previous emitter. As the emitter is not a digital device and contains a special material designed to emit IR light at a specified wavelength, there will be variance between each emitter from manufacture. We calculate the IR emitter signature (output) with the detectors for each IR channel and compute the correlation or emitted light to absorbed light using Beers law.
Calibration adds an extra set of values to the linearity algorithm. You will notice that after [coefficient E] there is a field titled [calibration]. This value will always be "1" when there is no calibration applied to the linearisation.
When a calibration is applied, the value will be close to "1". e.g. "0.989988564" but never "1"
- A IR cell cannot be linearised without first having a linearisation to apply it to.
- A calibration is specific to a linearisation only. You then apply this linearisation to a IR cell within an analytical method.
- Linearisation is specific to an IR cell. However you can have multiple linearisation for an IR cell to focus specifically on a region in the IR range you are interested in. This would then be applied to a unique analytical method and to that IR cell within the method.
- As all IR systems are non-linear, we use Beers law to "straighten" the light as IR light tends to "bend" when put through a medium (gas or liquid). Specific formulas (IP) are used to achieve this.
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