The application of Eltra pressure sensor

The Italian Eltra pressure sensor is the most commonly used sensor in industrial practice, and the pressure sensor we usually use is mainly manufactured by the piezoelectric effect. Such a sensor is also called a piezoelectric sensor.

　　 We know that crystals are anisotropic, while non-crystals are isotropic. Certain crystal media, when deformed by mechanical force in a certain direction, will produce polarization effect; when the mechanical force is removed, it will return to the uncharged state, that is, when under pressure, a certain These crystals may produce electrical effects, which is the so-called polarization effect. Scientists have developed a pressure sensor based on this effect.

　　 There are many kinds of pressure sensors, mainly:

　　1) Pressure sensor using the piezoelectric effect of crystal

　　 2) The pressure sensor is the most commonly used sensor in industrial practice, and the pressure sensor we usually use is mainly manufactured by the piezoelectric effect. Such a sensor is also called a piezoelectric sensor.

　　 At present, the pressure effect is also applied to polycrystals, such as current pressure ceramics, including barium titanate pressure ceramics, PZT, niobate pressure ceramics, lead magnesium niobate pressure ceramics and so on.

　　The pressure effect is the main working principle of the pressure sensor. The pressure sensor cannot be used for static measurement, because the electric charge after the action of external force is only saved when the circuit has an infinite input impedance. The actual situation is not like this, so this determines that the pressure sensor can only measure dynamic stress.

　　Eltra pressure sensor is mainly used in the measurement of acceleration, pressure and force. Pressure accelerometer is a commonly used accelerometer. It has the advantages of simple structure, small size, light weight and long service life. Pressure-type acceleration sensors have been widely used in vibration and shock measurement of aircraft, automobiles, ships, bridges and buildings, especially in the fields of aviation and aerospace. The pressure sensor can also be used to measure the combustion pressure inside the engine and the vacuum degree. It can also be used in the military industry. For example, it can be used to measure the change in chamber pressure at the moment when a bullet is fired in the chamber and the shock wave pressure of the muzzle. It can be used to measure large pressures as well as small pressures.

　　 With the development of the medical device market, higher requirements have been put forward for its supporting sensors. The most commonly used sensors in the medical industry are temperature and pressure sensors. There is still a certain gap between domestic medical equipment and foreign countries. In addition to the difference in manufacturing technology, the performance of the sensor is also on the one hand. Today's high-end medical devices have very high performance requirements for their supporting sensors, such as accuracy, reliability, stability and volume, which need to be improved accordingly. The following briefly talks about the application of the lower pressure sensor in the minimally invasive catheter and ablation surgery and the temperature sensor in the measurement of body temperature.

　　 Modern minimally invasive surgery can not only reduce the trauma of the surgical site, but also greatly reduce the pain of the patient, and the recovery process is also fast. The reason why such requirements can be met is related to various medical monitoring equipment in addition to the doctors' rich experience in surgery. Nowadays, many medical devices used for this kind of surgery are miniaturized, like various catheters and ablation devices. These catheters include thermodilution catheters, urethral catheters, esophageal catheters, central venous catheters and intracranial pressure catheters. In addition to their conduction function, the temperature or pressure sensors on the catheters also provide smooth pathological detection and minimally invasive surgery for patients. Provide important protection.

　　Because the above-mentioned catheters and surgical procedures have small wounds, it is generally difficult to directly observe their characteristics. However, temperature and pressure parameters are the key parameters for the success of the operation. Therefore, it is necessary to rely on the temperature and pressure sensors installed at the front end. These sensors are not only small in size, but also very high in accuracy and reliability, otherwise it will have a negative impact on the operation.

　　Mercury thermometers are traditionally used to measure the body temperature of patients in the medical field. This kind of thermometer has the disadvantages of slow response time and low accuracy. Nowadays, many large hospitals use electronic thermometers. This temperature sensor has short measurement time, high measurement accuracy, convenient reading, and also has a memory function. It has outstanding performance in clinical use. It usually consists of four parts: temperature probe, signal processing unit, display screen and power supply. The temperature probe is a sensitive component. Generally, one or several high-precision and fast-response thermistors are selected. It is directly related to the accuracy and response speed of the output temperature; the signal processing unit has two algorithms, heating and prediction. The heating algorithm can quickly shorten the detection time; the prediction algorithm is to predict the current body temperature according to the rising trend of the body temperature. This kind of temperature sensor can read the body temperature of the human body within 4S at the fastest, which is several orders of magnitude higher than the traditional mercury thermometer, and the advantages are quite obvious. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating coil fluid solenoid valve. It can be seen that the level of medical treatment is not only related to the doctor's clinical experience, but also largely depends on the various configurations of the hospital Medical testing equipment and the sensors installed on the equipment, the output parameters of these sensors play a leading role in the treatment of doctors.

　　 Application of pressure sensors: It is widely used in biomedical measurement. For example, ventricular catheter microphones are made of piezoelectric sensors. Because the measurement of dynamic pressure is so common, piezoelectric sensors are widely used. In addition to piezoelectric sensors, there are piezoresistive sensors manufactured by using piezoresistive effect, strain sensors using strain effect, etc. These different pressure sensors use different effects and different materials, and can play them in different occasions. Unique purpose.