Abstract:
벨트의 장력을 고정밀도이며 또한 저비용으로 구한다. 고유 주파수 측정장치는, 적어도 2개의 풀리에 벨트가 팽팽하게 설치된 벨트 전동장치이고, 상기 벨트의 인접하는 풀리 사이에 위치하는 부분을 진동 부가한 때의 진동으로부터, 상기 벨트의 고유 주파수를 측정하는 고유 주파수 측정장치에 있어서, 상기 벨트의 상기 부분에 장착되어 상기 벨트의 진동에 의한 가속도를 검출하는 가속도 센서와, 상기 가속도 센서에 의해 검출된 가속도에 기초하여 상기 벨트의 고유 주파수를 측정하는 측정기를 갖는다. 상기 측정기는, 상기 고유 주파수에 기초하여 상기 벨트의 장력을 구하는 계산을 행하는 벨트 장력 산출장치에, 상기 고유 주파수를 송신한다.
Abstract:
The operation of rotary equipment carried on elongate structure such as coiled tubing extending into a borehole from the Earth's surface is carried out by providing at least one optical fibre extending downhole to the rotary equipment from the surface, using optical time domain reflectometry to operating the optical fibre as a distributed vibration sensor while the rotary equipment is in operation, and thereby observing vibration created by the rotary equipment.
Abstract:
The operation of rotary equipment carried on elongate structure such as coiled tubing extending into a borehole from the Earth's surface is carried out by providing at least one optical fibre extending downhole to the rotary equipment from the surface, using optical time domain reflectometry to operating the optical fibre as a distributed vibration sensor while the rotary equipment is in operation, and thereby observing vibration created by the rotary equipment.
Abstract:
A strain sensor apparatus (40) for a rotatable shaft (34) comprising a radiation emitter/receiver (42), a vibration element (44, 60) attached to the shaft (34) and a radiation-reflective annulus (46) surrounding the shaft and vibration element.
Abstract:
In a method for monitoring strain variations of a strain responsive element of a micromachined sensor device while subjected to outside parameter conditions, at least two oscillation resonance modes of said element are activated and interrogated optically. Thereby correspondingly at least two resonance frequencies are obtained. From parameter/frequency characteristics of said device correspondingly at least two parameter values are derived.