Application of SOP linear displacement sensor in tunnel
Application of SOP linear displacement sensor in tunnel
Linear displacement sensor is a kind of non-electric measurement sensor which is widely valued and applied at home and abroad at present. It consists of a heat-treated vibrating wire detection element, and a spring with one end connected to the vibrating wire and the other end connected to the sliding pull rod to eliminate stress. With the pull of the sliding pull rod, the spring begins to extend and causes the tension of the vibrating string to increase, and the vibration frequency of the steel string also changes, and the tension is proportional to the extension of the spring. Therefore, the change of displacement can be realized by measuring the tension of the steel string, that is, the change of the vibration frequency of the steel string.
When applied to tunnels, it has the following advantages:
1. Strong anti-interference ability: frequency signal transmission, insensitive to cable length and resistance changes, and less affected by electromagnetic interference;
2. Good long-term stability: strong anti-interference ability, little influence by electric parameters, little zero drift, little influence by temperature, stable and reliable performance and long service life;
3. Absolute measurement: the measured value is frequency and absolute quantity, so there is no need to worry about data loss after power failure;
4. Adapting to harsh environment: resistant to humidity, dust and corrosion, and able to withstand high humidity, dust and chemicals in the tunnel.
At the same time, it is also an important part of the tunnel engineering monitoring system, which plays a sentry role, prevents accidents, protects life and property safety, avoids catastrophic maintenance, realizes preventive maintenance, reduces the whole life cycle cost, prolongs the service life of the tunnel through scientific maintenance, and realizes the intelligent management upgrade of tunnel operation and maintenance from "experience-driven" to "data-driven".
Therefore, in modern tunnel engineering, especially in long tunnels, important traffic trunk tunnels and urban subway tunnels, Linear displacement sensors are widely used in many fields, such as displacement, settlement, deformation and cracks of structural objects in buildings, dams, bridges, rocks, concrete, soil, roads, factories and other projects, to monitor long-term relative displacement changes.
