Colour analysis appts. for obtaining green to magenta in thermocolorimeter

摘要

The appts. includes blue (1), red (2), and green (3) sensors with respective amplifiers, an inverter (5) and two galvanometers (6,7). The outputs of the three sensors are amplified (4) and fed to the galvanometers. The blue and red channels incorporating an inverting switch (5). With the inverting switch in a first position one galvanometer gives the blue to red ratio. When the inverting switch is moved to a second position green is compared to the combination of blue and red giving the ratio of green to magenta. The two galvanometers may be replaced by a single galvanometer and inverting switch.