How the pressure sensor works

Inductive pressure sensors are devices that measure pressure by detecting changes in the self-inductance or mutual inductance of a coil. These sensors can be categorized into three main types: self-inductive pressure sensors, differential self-inductive pressure sensors, and differential transformer (LVDT) pressure sensors. Each type operates based on the principle of electromagnetic induction, where variations in the magnetic field caused by mechanical movement translate into measurable electrical signals.

The self-inductive pressure sensor is one of the most common types and comes in three subcategories: variable gap, variable area, and screw insertion designs. The variable gap type, for example, consists of a coil, a core, and an armature. When pressure is applied, it causes the measuring rod to move, which in turn displaces the armature. This displacement alters the air gap between the core and the armature, leading to a change in the coil's inductance. This change is then converted into an electrical signal—such as voltage, current, or frequency—through a connected circuit, allowing for accurate pressure measurement.

It's important to note that the relationship between the inductance change and the air gap in a self-inductive sensor is nonlinear. This nonlinearity can affect the accuracy of the sensor and often requires calibration or compensation techniques to ensure reliable results. Additionally, the design of the sensor plays a critical role in its performance, with factors such as material quality, coil winding, and mechanical stability all contributing to overall precision.

Global hardware network

Stay updated with the latest in sensor technology

Tag: Pressure sensor, Measuring rod, Working principle, Self-inductive coil

Previous: Types, Principles and Applications of Pressure Sensors Next: Advantages and Disadvantages of Three Polishing Methods for Stainless Steel

Cement Superplasitcizer

Manufacturing method
Using methyl naphthalene and sulfur trioxide as raw materials, the product was synthesized by sulfonation, condensation, neutralization and drying.
The degree of polymerization of water reducing agent is generally about 6-12, that is: n= 6-12, if the degree of polymerization is 1-3, it is used as a dispersant.
Concrete admixtures can be divided into four categories according to their main functions:
1. Admixtures to improve the variable performance of concrete mixing: including various water reducing agents, air entrainment agents and pumping agents.
2. Adjusting concrete setting time, hardening performance of admixtures: including retarding agent, early strength agent, accelerator and so on.
3. The admixtures to improve the durability of concrete include air entraining agent, water repellent agent, and rust inhibitor.
4. Other additives to improve the performance of concrete: including air entrainment agent, expansion agent, antifreeze agent, colorant, waterproofing agent and pumping agent.
According to the naming and definition of (GB8075-87) admixtures, admixtures can be divided into 16 names, which are respectively defined as follows:
1. Ordinary water reducing agent: an admixture that can reduce the amount of water used in mixing under the condition of the same slump of concrete;
2. Early strength agent: the admixture that accelerates the early strength development of concrete;
3. Retarding agent: admixture for extending the setting time of concrete;
4. Air entraining agent: an admixture which can introduce a large number of uniformly distributed, stable and closed micro bubbles in the mixing process of concrete;
5. High efficiency water reducing agent: admixture which can greatly reduce the water consumption of the mixture under the same conditions of concrete collapse;
6. Early strength water reducing agent: both early strength and water reducing function of water reducing agent;
7. Retarding and water reducing agent: a water reducing agent with both retarding and water reducing functions;
8. Air-entraining and water-reducing agent: admixture with air-entraining and water-reducing functions;
9. Waterproofing agent: can reduce the water permeability of co

Cement Superplasitcizer,concrete mix chemical,cement retarder,cement admixtures,concrete additives for strength

Shanghai Hongyun New Construction Materials Co., Ltd , https://www.hongyunpce.com