| 摘要 |
With the measurement unit (7) empty and with the maximum (or approximately 100%) transmissivity of the first dimmer apparatus (3) and the second dimmer apparatus (4), the output voltages of the preamplifier (11) (i.e. the value Pa corresponding to the first light source 1 and the value Pb corresponding to the second light source 2) are stored in the memory unit (16). The appropriate transmissivity computation unit (17) compares the Pa value with the Pb values, sets the smaller value as Ps, and computes the appropriate transmissivity (Ps/Pa)×100 of the dimmer apparatus (3) and the appropriate transmissivity (Ps/Pb)×100 of the dimmer apparatus (4). The controller (15) sets the transmissivities of the dimmer apparatus (3) and the dimmer apparatus (4) to have the previously obtained respective appropriate transmissivities. As a result, both the output voltages (or the values corresponding to the first light source (1) and second light source (2)) of the preamplifier (11) become Ps. The value of Ps is optimized by changing the sensitivity of the photoelectric detector (10). Accordingly, it is possible to equalize the amounts of light of plural lamps (or light sources) simultaneously used, without deteriorating the S/N, unsteadying the lamp's amount of light, and shortening the lamp's lifetime.
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