Piezoelectric sensor: description, acceleration, operating principle and features

To obtain data on the temperature or pressure of the atmospheric environment, special piezoelectric sensors are used. The main parameters of the devices are not only the operating frequency, but conductivity, as well as resistance. The standard modification consists of a membrane, which is surrounded by quartz plates. The body is mainly made of metal discs. For connection to the measuring equipment, the pins that are connected to the thrust bearing are used.

Principle of operation of the element

There are various piezoelectric sensors. The principle of the elements is based on the change in the membrane capacity. Quartz plates in this case play the role of conductors. For frequency conversion, models use a shielded plate. The signal is transferred to the membrane through the thrust bearing. The difference in bits is fixed in the measuring instruments. Through the terminals on the sensors, the data can be processed and stored.

Types of sensors

By designation, the sensors are given strength, pressure, vibration and acceleration. There are also modifications for temperature measurement. Another division of modifications occurs according to frequency. Models up to 3 Hz are compact in size. Modifications with high conductivity are able to work in conditions of high humidity.

Power sensors

Piezoelectric force sensors have recently taken an active part in laboratory research. They are distinguished by increased accuracy and good conductivity. However, it is important to note that the operating frequency in this case is at the level of 4 Hz.

Many modifications are made with conventional contact membranes. Also worth noting that the stores are wired devices with quartz plates. The conductivity index of such sensors is approximately 5 microns. Many modifications can be used in conditions of high humidity. The capacitance of conductors in this case is equal to 55 pF. Models for this type of sensor are not available.

Pressure Sensors

Piezoelectric pressure sensors are manufactured with membranes of different types. If you believe the experts' opinions, the contact elements are considered to be the most demanded devices, the conductivity index of them is equal to 8 microns. The maximum operating frequency is 5 Hz. Contact membranes of sensors are rare. Quartz plates are installed through the terminals. The average conductor capacity is 120 pF.

Special attention is paid to compact bushing modifications. As a rule, they are of the screened type. For measuring equipment, sensors of this type are suitable. Quite often they are connected to oscilloscopes. The bearings of the modifications are of a transitional type. Some models are able to boast a high accuracy of measurements.

Features of temperature sensors

Piezoelectric temperature sensors operate on low-resistance modules. If you believe the experts' opinions, the membranes are mainly of the contact type, and the adapters used for them are of low conductivity. Quartz plates are able to work in conditions of high humidity. If we talk about the shortcomings, it is important to note that the models are produced mostly without footsteps. Instead, special insulation films are installed on the membranes. The permittivity index lies in the region of 50%.

Acceleration Sensors

Piezoelectric acceleration sensor is often used in industry. The conclusions of the models are connected through the membranes. Some devices are manufactured specifically for driving units. The membranes in this case are set to a contact type. It is also worth noting that the stores feature elements that work on polished plates.

The bearings are mainly used in compact dimensions. Isolation in models is of high quality. Metal linings are rare. Also it should be noted that there are devices that are capable of operating at a frequency of 3 Hz. Their conductivity index, as a rule, does not exceed 44 microns. The capacitance of conductors in this type of model is in the region of 40 pF.

Elements of the series VM-6360

The sensors of the presented series can very quickly determine the temperature of the environment. If you believe the experts' opinion, the conductivity is rather high. Among the shortcomings, it is worth noting the small resistance at the conclusions. Also, specialists often point to a module that operates at a frequency of 3 Hz. Thus, the measurement accuracy of the modification is not very high. The membrane in this case applies only one. Conclusions to it are connected through a step bearing. If you believe the opinion of experts, then the problems with modulation of this sensor are not terrible. Quartz plates are installed reliably.

Arduino sensor features

Arduino is a piezoelectric vibration sensor that can be operated in different climatic conditions. The membrane of the element applies only one. In this case, the plates are installed with two pads. If you believe the experts, the conductivity is rather high. The dielectric constant of the plates is 55 microns.

Many experts say that the sensor has a high accuracy of measurements. If we talk about the minuses, experts point to a low resistance parameter in the membrane. Due to this, there are problems with signal transmission. The leakage of charges to this sensor is not terrible. The operating frequency is maintained at 5 Hz.

Description of the Master 300 CT Series

This piezoelectric sensor is required for accurate pressure determination. The module in the system is of the wave type. Many experts say that the model can be used in an environment with a moisture content of not more than 55%. The disk of the modification is of a spherical type.

Also worth noting is that the working temperature of the element is at most 45 degrees. The thrust bearing is highly conductive. At the same time, he has certain problems with permeability. Connection to the measuring devices takes place through two terminals.

Elements of the Master 330 CT series

These are high-quality and high-precision piezoelectric sensors. The principle of the element's operation is based on a change in the digit capacity. Specialists believe that the modification has a quality wire output. The membrane is used in this case with quartz plates.

The parameter of the dielectric constant is located at 3%. The minimum frequency is maintained at 3 Hz. The protection system for this sensor is not available, however, isolation is provided. Also worth noting that the modification has only one lining, which is made of copper.

Features of the Master 350 CT

The piezoelectric sensor is designed to determine the temperature in corrosive media. Many experts point to a high parameter of the output resistance. In this case, the module is of the contact type, and the insulation is used in the third class. In total, the device has two quartz plates. Their conductivity is 4 microns. The operating frequency is generally 3 Hz. The spherical heel of this modification is absent. The semiconductor capacitance is 40 pF.

Description of elements of the Master 380 CT series

This piezoelectric sensor is allocated by rapid transmission of positive potential. It is also worth noting that the model uses only one contact type module. Many experts say that the model is allowed to use in a high humidity environment. However, the sensor also has drawbacks. First of all, it is worth mentioning the low dielectric permittivity. Problems with resistance are rare.

The thrust bearing is unable to operate at a frequency of 3 Hz. The manufacturer does not provide a protection system for the modification, and the insulation is installed in the second class. Connection to the measuring equipment is carried out through two outputs. A fifth spherical type is capable of operating at a frequency of 5 Hz. The transfer of negative potential does not take much time.

Elements of the MLH200 series

This piezoelectric sensor is able to quickly measure the ambient pressure. If we talk about the features of the modification, it is important to note a good parameter of the output resistance. The permittivity of the element is only 40%. The fifth spherical type is installed together with the contact diaphragm.

It is also worth noting that the model is able to quickly transmit positive potential. The protection system for the modification is not provided, and the insulation is installed in the third class. Connection to the measuring equipment can be carried out through two terminals. The sleeve at the modification is connected to quartz plates. It is also worth noting that the semiconductor capacity is 30 pF.

Features of MLH220 sensors

This piezoelectric vibration sensor is produced with two contact membranes. In this case, quartz plates are used for increased permeability. The operating frequency of the modification is 4 Hz. If you believe the opinion of experts, the hull is capable of withstanding heavy loads. It is also worth noting that the resistance at the output contacts is approximately 30 ohms. Unfortunately, the element's protection system is not provided.

However, the insulation is installed first class. The shielded bushing is fixed on the membrane in this case. Many experts say that the model can boast of a rapid transfer of positive potential. Also worth noting that the model has a special module that is responsible for the conductivity of the signal. The conductor capacity is 50 microns. The dielectric constant of the element is not less than 60%. The leakage of charges to the presented sensor is not terrible.

Description of the elements of the MLH255 series

This sensor (piezoelectric, intrinsically safe) is manufactured with a single transition membrane, which has a very high negative resistance parameter. With increased humidity, problems occur infrequently, and insulation is used in the third class. In total, the sensor has three quartz plates.

Also worth noting that the model has a good conductivity at the output. Metal lining under the membrane manufacturer is not provided. Separate attention deserves a quality conductor, whose capacity is 4 pF. The protection system of the element is not provided. At the same time, the transmission speed of the negative potential leaves much to be desired.

Elements of the MLH265 series

The sensor of the presented series is produced with two membranes, which have a conductivity of 4 μ. Quartz conductors are capable of operating at a humidity of 55%. The maximum operating temperature is 40 degrees. The protection system for this sensor is not available, and insulation is applied in the second class. The minimum frequency of the element is maintained at 5 Hz.