Diffused silicon pressure sensor type low pressure silicon sensor can respond to tenths of pounds/in2 of stress. This product has been produced and used.
Diffusion silicon pressure sensor selection
(Introduction: Diffused silicon pressure sensor low-voltage silicon sensor can respond to tenths of pounds/in2 of stress. This product has been produced and used. In very small variations, silicon sensors have been able to measure liquids. A slight change in position pressure or a pressure applied by exhalation. These devices use a new technology of pressure sensing that can replace mechanical pressure devices for many applications. But how can you make the best choices in your application? A good way to judge It is to test the difference between the silicon sensor and the traditional sensor, the market advantage and the technical specifications of the silicon sensor you use. What can correctly form the low voltage sensor system?)
Diffused silicon pressure sensor type low pressure silicon sensor can respond to tenths of pounds/in2 of stress. This product has been produced and used. In very small variations, silicon sensors have been able to measure weak changes in liquid level pressure or pressure applied by exhalation. These devices use a new technology of pressure sensing that can replace mechanical pressure devices for many applications. But how can you make the best choice in your application? A good way to judge is to test the difference between the silicon sensor and the traditional sensor, the market advantage and the technical specifications of the silicon sensor you are using.
What constitutes a low-pressure sensor system correctly? In general, typical pressures in silicon sensors range from 0–0.15 psi FS, often up to 0–10,000 psi. The company defines different low pressures based on the design of their sensors and their production processes. Sensors that respond to less than 5 psi typically require different die topologies and process technologies. According to the discussion of this issue, a pressure of less than 5 psi is defined as the low pressure range.
Differences in silicon processes form low-voltage sensing silicon micromechanical components manufactured by similar processes to form standard pressure-span components, but there are key differences. Standard range components include a resistive bridge (Wheatstone mode) etched onto a thin diaphragm. When the voltage excited by the voltage source forms a diaphragm offset, the resistance value is changed and a change in the output voltage is caused. Low-voltage silicon sensors operate similarly, but also have significant features, including protruding diaphragm structures and approximately 50% of the diaphragm area for stress concentration. Precisely etching the film thickness and strategic placement resistance can also greatly increase the sensor's capacity. In addition, the use of traditional semiconductor batch processes for silicon sensors will also have the cost advantage of scale production.
Low-voltage silicon sensors are commonly used in three main markets:
Diffused silicon low pressure sensors are an integral part of heating, ventilation and air conditioning systems. In other applications, they can monitor ventilation and air flow, determine the volume of airflow, detect load problems due to dirty filter changes, and control the pressure of the entire system. These applications require the product to detect pressure differentials at pressure changes of 0.015 psi.
Medicine. Without a small sensor size, it is impossible for many medical applications to detect environmental changes and conditions. Therefore, the design must meet the following requirements: a relatively small sensor (1–2 mm) that measures fluid pressure in the human body. These devices are typically catheter devices that can be inserted into the skull, heart chamber or uterus to monitor forcuous surgical procedures in real time, which is a one-off, low-cost product. Low pressure products for respirometers require sensor ranges below 0.5 psi. These jobs were previously performed by mechanical pressure switches that vary according to time.
Automotive. Low cost and high reliability are the basic elements that make up the condition of an external car, including jets, petrol steam and exhaust. Recent cars use silicon sensors to monitor tire, line and brake pressure. The range of applications for silicon semiconductor sensors can also be extended to manufacturing packaging technologies to protect automotive components from harsh environmental conditions.
Application Requirements and Sensor Types Because each application has its own characteristics, you must take into account all aspects of the overall system impact during the selection process. Be sure to determine the pressure source input, the desired output, and various related operating conditions. Mounting position and orientation, proximity to the pressure source, wire stress, interface and pressure connections, determination of the impact performance and impact accuracy of the package. For example, in medical applications, membrane elements that sense pressure must be packaged without packaging. In the measurement process affected by temperature fluctuations, more advanced sensors must be used to compensate and calibrate the offset so that the temperature coefficient of the material is eliminated. Environmental conditions such as humidity and pollution can also have an impact on medical protection applications. The trade-off in accuracy is that the microprocessor controls certain characteristics and eliminates undesirable results. The compatibility of the system components (such as power supplies, amplifiers, A/D converters, control circuits) with the sensor's analog output signals must achieve the desired solution and the accuracy of the overall design.
Each pressure sensor has material properties that can form measurable output data based on applied pressure changes. When you are considering the technical data of a universal detector, it is important to keep in mind your technical needs.
Silicon micro-mechanical materials. These products consist of a micro-mechanical silicon diaphragm that is infused with a resistor that produces a piezoelectric change under pressure. Applications include medical ventilation, body pressure detection, automotive ventilation, vacuuming, and steam pressure.
Electronic materials. These products include strain gauges and variable capacitance sensors (made of non-micro-mechanical silicon). The strain gauge uses a coupling effect of deflection thickness/film, foil or bonded foil. The variable capacitance element combines the change in capacitance and converts it into a measurable signal. Stress gauges are used in contact and mechanical pressure applications.
Vacuum gauge. The vacuum sensor uses the heating wire as one leg of the balance bridge and detects the pressure by measuring the change in its resistance. They are primarily used to detect vacuum values reached by vacuum pump chambers, such as electron microscopes and other process equipment.
Piezoelectric materials. These sensors are made of polymers, crystals, ceramics, and thin films that are polarized when they are applied mechanically. These products are ideal for use in dynamic pressure sources and are not suitable for continuous static conditions such as atmospheric pressure. They work well in harsh environments.
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