- 4 -
Fig. 3. Typical spectral sensitivity of the L 200 probe.
1.3.2. Directional characteristics
The unique optical system of the measurement probe ensures an identical assessment
of every point of the tested surface. The special attention should be paid to the fact that
the countersink angle for the cone of rays reaching the detector from every point of the
tested object is identical with the measurement field angle, which is unachievable for
standard luminance meters and can become the source of serious measurement errors
for them. Such shape of the beam of rays is the main attribute for the LMC-10
measurement probe and its enormous advantage over other meters available on the
market. Therefore, the influence of luminance irregularity of the monitor matrix for
various directions of observations is negligible in the case of the LMC-10 meter.
Fig. 4. Directional response of the LMC 10 probe.
1.4. Temperature compensation
The change in the temperature of the probe influences the measurement result. Due to
the temperature change, the other parameters also change and they are as follows :
●
detector dark current
- shift of zero indication,
●
offset voltage of the measuring circuit - shift of zero indication,
●
responsivity of a detector
- change of measured quantity value,
