Kind Of Pressure Sensor Research Articles

Reliable Manipulation of Gas Bubble Size on Superaerophilic Cones in Aqueous Media.

Gas bubbles in aqueous media are ubiquitous in a broad range of applications. In most cases, the size of the bubbles must be manipulated precisely. However, it is very difficult to control the size of gas bubbles. The size of gas bubbles is affected by many factors both during and after the generation process. Thus, precise manipulation of gas bubble size still remains a great challenge. The ratchet and conical hairs of the Chinese brush enable it to realize a significant capacity for holding ink and transferring them onto paper continuously and controllably. Inspired by this, a superhydrophobic/superaerophilic cone interface is developed to manipulate gas bubble size in aqueous media. When the resultant force between the Laplace force and the axial component of the buoyancy force approaches zero, the gas bubble is held steadily by the superhydrophobic/superaerophilic copper cones in a unique position (balance position). A new kind of pressure sensor is also designed based on this principle.

Characteristics research of pressure sensor based on nanopolysilicon thin films resistors

To further improve the sensitivity temperature characteristics of pressure sensor, a kind of pressure sensor taking nanopolysilicon thin films as piezoresistors is proposed in this paper. On the basis of the microstructure analysis by X-ray diffraction (XRD) and scanning electron microscope (SEM) tests, the preparing process of nanopolysilicon thin films is optimized. The effects of film thickness and annealing temperature on the micro-structure of nanopolysilicon thin films were studied, respectively. In order to realize the measurement of external pressure, four nanopolysilicon thin films resistors were arranged at the edges of square silicon diaphragm connected to a Wheatstone bridge, and the chip of the sensor was designed and fabricated on a [Formula: see text] orientation silicon wafer by microelectromechanical system (MEMS) technology. Experimental result shows that when [Formula: see text] = 6.80 mA, the sensitivity of the sensor PS-1 is 0.308 mV/kPa, and the temperature coefficient of sensitivity (TCS) is about −1742 ppm/[Formula: see text]C in the range of −40–140[Formula: see text]C. It is possible to obviously improve the sensitivity temperature characteristics of pressure sensor by the proposed sensors.

A Fiber Bragg Grating Pressure Sensor and Its Application to Pipeline Leakage Detection

The fiber Bragg grating (FBG) technology has been rapidly applied in the sensing technology field. In this paper, an FBG pressure sensor is designed and implemented to detect the leakage of prestressed concrete cylinder pipe (PCCP). The pressure sensor is mainly based on a Bourdon tube with two FBGs bonded on its outside and inside surfaces, respectively. The measurement principle and simulation analysis results are described. The wavelength shift difference of the two FBGs is utilized as a pressure sensing signal, the sensitivity is enhanced, and the temperature cross-sensitivity is compensated. Experimental results indicate that the measurement sensitivity is 1.414 pm/kPa in a range from 0 to 1 MPa, and the correlative coefficient reaches 99.949%. This kind of pressure sensor is effective to quasi-distributed measure and online monitor pressure of gas or liquid in industry and manufacture fields.

A diaphragm-type fiber Bragg grating pressure sensor with temperature compensation

A diaphragm-type fiber Bragg grating (FBG) pressure sensor with two bare FBGs directly bonded on a circular diaphragm along the radial direction has been proposed and studied. Measurement principle and simulation analysis of the pressure sensor are introduced. Using the wavelength shift difference of the two FBGs which respectively measure the positive and negative strain as sensing signal, the pressure sensitivity is increased and the temperature cross-sensitivity is compensated. Experimental results indicate that the measurement sensitivity is 1.57pm/kPa in a range from 0 to 1MPa, the correlative coefficient reaches 99.996%, and the temperature compensation performance is distinct. This kind of pressure sensor could be used to measure and monitor the static/dynamic pressure of gas or liquid.

Residual stress effect on luminescence of CeBr 3 and its application as a pressure-memory material

Photoluminescence spectra of CeBr 3 powder compacts with various compaction pressures have been measured under ambient conditions and they are found significantly redshifted compared with those of the original powder by nearly 20 nm (∼1440 cm −1) at the compaction pressure of ∼1.0 GPa. The spectral shift increases extremely rapidly with the compaction pressure and then plateaus at ∼1.0 GPa. The observed residual stress effect of the CeBr 3 powder on the luminescence spectra is much larger than that of the EuCl 2 powder reported previously. The luminescence peak wavelength of the compact can be easily tuned between 360 and 380 nm by simply changing the compaction pressure applied to the CeBr 3 powder. With a very large residual stress effect of the CeBr 3 powder on the photoluminescence spectra, this material would make a good pressure-memory material which may be used as a kind of pressure sensor in high-pressure experiments.

Fiber loop ring-down optical fiber grating gas pressure sensor

A kind of bare fiber Bragg grating (FBG) gas pressure sensor based on fiber loop ring-down is presented, in which there are no sensitizing means or assistant structure on the bare FBG. The pressure sensitivity is analyzed theoretically via discussing the relationship between the ring-down time and the gas pressure. By detecting the ring-down time at different gas pressure levels, the gas pressure characteristics of the bare FBG are investigated in the time domain. The experimental results demonstrate that there exists a linear dependence of the pressure applied to the bare FBG on the ring-down time. A high sensitivity of −0.384 μs/MPa (being equivalent to −240 pm/MPa) could be achieved, which is 79 times larger than that of the optical spectral analyzer interrogated. This kind of pressure sensor could be used for gas or liquid pressure measurement.