TOTAL INTERNAL REFLECTION OPTICAL MEMBER, AND TOTAL INTERNAL REFLECTION MEASURING DEVICE PROVIDED WITH SAME

摘要

The present invention provides a total internal reflection prism which can be used in a multiple reflection method, and which enables a reduction in a contact surface area with a specimen. A total internal reflection prism 2 comprises a plate-shaped optical member, and includes a measuring light introducing portion 2A and a measuring light leading-out portion 2D provided in positions away from the center of either a front or a back surface, wherein a plurality of planar surface portions 2B, 2C and 2E are each formed perpendicular to the front and back surfaces on an outer periphery of the total internal reflection prism 2 excluding the front and back surfaces thereof. The introducing portion 2A is provided in such a way that measuring light that has been introduced into the interior is incident with a total internal reflection angle of incidence toward either the front surface or the back surface. The front and back surfaces are provided in such a way as to cause the measuring light to progress while being total internally reflected alternately thereby, and the plurality of planar surface portions 2B, 2C and 2E are provided in such a way as to reflect sequentially, in different directions, the measuring light that is progressing through the interior. The leading-out portion 2D is provided in such a way as to cause the measuring light that has been reflected by the plurality of planar surface portions 2B, 2C and 2E to be led out to the outside.