| 摘要 |
PURPOSE:To evade a decrease in intensity due to the branching of primary light and to monitor the intensity of the primary light by providing a function for measuring the intensity of light to an optical element such as a lens and a mirror constituting an optical system. CONSTITUTION:When light passes through a glass component such as a lens and a prism, part of the energy of the light is converted into heat energy to generate an optoacoustic signal and a heat wave. Further, even when the light is reflected by a total reflecting mirror, etc., part of the light energy is absorbed and converted into an optoacoustic signal and a heat wave. When the light passing through the prism 1 is monitored, a pyroelectric element 2 is adhered on the surface facing the incidence surface and projection surface of the prism 1. Part of the primary light passing through the prism 1 is absorbed by the prism to generate heat. The generated heat is detected by the pyroelectric element 2. Its pyroelectric signal is inputted from electrode terminals 3 and 4 to a voltage measuring circuit and amplified. The level of the pyroelectric signal is proportional to the intensity of the primary light, so the primary light intensity can be monitored.
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