Abstract: A measurement device includes a light emitter, a light receiver, an amplifier, and a computation processor. The light emitter irradiates, with light, an irradiation target having an internal space through which a fluid flows. The light receiver receives coherent light including light scattered by the irradiation target and outputs a signal corresponding to intensity of the coherent light. The amplifier amplifies the signal output from the light receiver. The computation processor calculates a first frequency spectrum of signal strength for each frequency with respect to a temporal strength change in the signal amplified by the amplifier, and calculates a calculation value on a flow state of the fluid with a computation including division using a first value and a second value. The first value is a value of a frequency based on the first frequency spectrum. The second value is a value of strength based on the first frequency spectrum.

Abstract: There is provided an electronic component mounting substrate which excels in resistance to migration, and is thus capable of maintaining high thermal conductivity and insulation performance for a long period of time. An electronic component mounting substrate includes: a metallic substrate formed of aluminum or an aluminum-based alloy; an alumite layer disposed on the metallic substrate, having a network of crevices at an upper surface thereof; and a ceramic layer disposed on the alumite layer, part of the ceramic layer extending into the crevices.

Abstract: There is provided an electronic component mounting substrate which excels in resistance to migration, and is thus capable of maintaining high thermal conductivity and insulation performance for a long period of time. An electronic component mounting substrate includes: a metallic substrate formed of aluminum or an aluminum-based alloy; an alumite layer disposed on the metallic substrate, having a network of crevices at an upper surface thereof; and a ceramic layer disposed on the alumite layer, part of the ceramic layer extending into the crevices.