What is the working principle of the blister level?


Release time:

2023-01-11

What is the working principle of the blister level? The inclinometer is also called a blister level. The blister level is usually mainly used to measure the level of the control system at different angles. In the past such pass sensors were simple bubble levels. With the development of automation and electronic data measurement information technology in China, the types of inclinometers have gradually begun to increase.

What is the working principle of the blister level?

What is the working principle of the blister level?

The inclinometer is also called a blister level. The blister level is usually mainly used to measure the level of the control system at different angles. In the past such pass sensors were simple bubble levels. With the development of automation and electronic data measurement information technology in China, the types of inclinometers have gradually begun to increase.

From the analysis of work management principles, they can not only learn to be divided into the following three product types: "solid pendulum" type, "liquid pendulum" type and "gas pendulum" type, but now let us understand and how they improve work. Force balance servo drive systems are more widely used in the design of industrial solid pendulums. The blister level is composed of pendulum, cycloid and bracket parts. The pendulum is affected by its own gravity G and pendulum tension T, and its resultant force F = Gsinθ = mgsinθ, where θ is the angle between the cycloid and the student in the vertical movement direction. When the measurement is realized in the range of small angle considerations, F and θ are linear, and the strain-type blister level is based on this method principle. The structuralist principle of the liquid pendulum is that there is a conductive liquid in the glass shell, and there are three platinum electrodes connected to the outside. The three electrodes are parallel to each other at equal intervals. When the shell is horizontal, the electrodes are inserted into the conductive liquid at the same depth. If no AC voltage with a certain equal amplitude of influence is applied between the two selected electrode surfaces of the enterprise, a metal ion generating current will form between the electrode systems. The liquid between the two standard electrode reactions is equivalent to the two resistors RI and RIII. If the patient fluid pendulum is horizontal, RI = RIII. When the glass shell is tilted, the conductive liquid between the electrodes is not equal, and the immersion depth of the three electrodes in the liquid also changes in time, but the immersion depth of the middle electrode teaching basic economy remains stable. If the immersion depth of the left electrode is small, the conductive liquid decreases at the same time, the number of conductive ions reaches a decrease, and increases according to the resistance RI. Conductive liquid is added to the opposite electrode, the number of conductive ions increases significantly, and the resistance RIII decreases, I .e. RI>RIII. Conversely, if the tilt policy direction is completely opposite, RI

The inertial element of the bubble level consists of a closed cavity, gas and a hot wire. When the plane of the cavity is inclined relative to the horizontal plane or the cavity is accelerated, the resistance of the hot wire changes. The resistance of the hot wire changes with the change of angle Q or acceleration, so it also acts as a pendulum. The change in the resistance of the hot wire is caused by the energy exchange between the gas and the hot wire. The sensing mechanism of the "gas pendulum" inertial device is based on the energy transfer in a closed cavity. There are gas and hot wire in the cavity, and the hot wire is the heat source. When the device is energized, the gas is heated. It is the main form of convective hot-wire energy exchange. The core sensitive element of the gas pendulum detector is the hot wire. Current flows through the hot wire, generating heat and maintaining it at a certain temperature. The temperature of the hot wire is higher than the temperature of the surrounding gas, the kinetic energy increases, and the gas flows upward. In the equilibrium state, the hot wire is located on the same horizontal plane, and the rising air velocity through the hot wire is the same, that is, v1 = v1 '. At this time, the influence of air flow on the hot wire is the same. It can be seen from formula (7) that the current flowing through the live wire is the same and the bridge is balanced. When the closed cavity is inclined, the height of the hot wire relative to the horizontal plane changes. Since the air flow in the closed cavity is continuous, in the process of upward movement, the hot air flow passes through the lower and upper hot wires in turn. If the energy loss of overcoming gravity in the process of gas rising is ignored, the airflow passing through the upper hot wire will exchange heat with the lower hot wire, so that the flow velocity of the airflow passing through the two hot wires is different, and the electrical signal output changes with the inclination angle.

 

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