Abstract: A thermoelectric power generation apparatus includes: a higher-temperature side heat conductor; a lower-temperature side heat conductor disposed at a distance from the higher-temperature side heat conductor; a thermoelectric power generation module including a higher-temperature side electrode that is in thermal contact with the higher-temperature side heat conductor, and a lower-temperature side electrode that is in thermal contact with the lower-temperature side heat conductor; a heat insulating member disposed between the higher-temperature side heat conductor and the lower-temperature side heat conductor, the heat insulating member accommodating the thermoelectric power generation module; and an integrating member provided separately from the heat insulating member. The higher-temperature side heat conductor and the lower-temperature side heat conductor are integrated with each other by the integrating member with the heat insulating member interposed therebetween.

Abstract: An optical sensor is provided, in which members forming an optical path can be reliably supported without blocking the optical path extending from a light source to a light receiver. An optical sensor includes a light source configured to emit light, and a light receiver configured to receive the light emitted from the light source. An optical path extending from the light source to the light receiver extends through an oil infiltrating space into which oil infiltrates. The optical sensor further includes: a substrate on which the light source is mounted; a substrate on which the light receiver is mounted; a fixing member including an accommodation space in which the substrates are accommodated; and a sealing resin contained in the accommodation space and sealing the substrate.

Abstract: Provided is a tunnel boring machine that can detect a wear condition of a disc cutter with a highly reliable configuration. The tunnel boring machine includes a measurement device. The measurement device is disposed behind the disc cutter mounted on a cutter head. The measurement device has a function as an acquisition unit that acquires cutting edge position data indicating a position of a cutting edge part of a cutter ring in the disc cutter. The tunnel boring machine further includes a DC discrimination unit that discriminates which one of a plurality of disc cutters is the disc cutter the cutting edge position data of which is acquired by the measurement device and a wear amount calculator that calculates a wear amount of the cutting edge part of the discriminated disc cutter.