Yamatake Corporation

Yamatake-honeywell Co., Ltd.

Yasuhiro Kajio

Hiroyuki Muto

Masayuki Yoneda

Youichi Azuma

Shoji Kamiunten

Yoshiyuki Kanai

Shingo Masumoto

Kazumasa Ibata

Shigeki Shoji

Masaki Takechi

Mitsuhiko Nagata

Ryu Akimoto

Masaya Ishikawa

Jun Mizoguchi

Naohisa Tsuchiya

The long-side surface of a triangular prism is a detection surface. The distal end portions of coaxial light-emitting/light-receiving optical fiber cables are joined to one short-side surface of the prism. A thermoelectric cooling element is mounted on the other short-side surface of the prism. A mirror is provided between the cooling surface of the thermoelectric cooling element and the short-side surface. When dew condensation occurs on the detection surface, part of light applied from an optical fiber on the light-emitting side onto the lower surface of the detection surface exits from the prism through the condensed dew. The specular reflection returns to the lower detection surface by a mirror surface and is specularly reflected again. The specular reflection then enters an optical fiber on the light-emitting side. Dew condensation on the detection surface is detected by a change in the intensity of light received through the optical fiber.

Detector for detecting state on detection surface

The pressure sensor device has a laminated diaphragm () in which a strain resistance gauge is formed in a surface and a stopper member () including a concave portion forming a curved surface parallel to a surface formed by displacement of the diaphragm, the concave portion being disposed to face the diaphragm. Specifically, the concave portion of the stopper member is formed into a curved surface in which depth y at a distance x from the center of the diaphragm is expressed by a quartic function [y=pr(1&#x2212;x/r)/64D] in relation to the operating pressure for protection against maximum pressure p when the diaphragm has a radius of r, a thickness of t, and a flexural rigidity of D.

Pressure sensor device including a diaphragm and a stopper member having a curved surface facing the diaphragm

A thermal conductivity measuring device includes a diaphragm portion, a thermal conductivity detector, a temperature sensor, a control section, and a thermal conductivity calculating section. The diaphragm portion is formed on a base. The thermal conductivity detector is formed in the diaphragm portion to perform conduction of heat to/from a sample gas. The temperature sensor is disposed on the base to be near the thermal conductivity detector so as to measure the ambient temperature around the base. The temperature sensor is thermally insulated from the thermal conductivity detector. The control section controls the amount of energy supplied to the thermal conductivity detector such that the temperature difference between the ambient temperature measured by the temperature sensor and the heating temperature of the thermal conductivity detector becomes a constant value. The thermal conductivity calculating section calculates the thermal conductivity of the sample gas on the basis of the amount of energy supplied to the thermal conductivity detector while the temperature difference is kept at the constant value by the control section.

Thermal conductivity measuring device

Growing community of inventors

Tokyo, Japan

Yasuhiro Kajio