Some New Developments in Fluidic Circuit Design

1984 ◽  
Vol 106 (3) ◽  
pp. 231-235
Author(s):  
T. M. Drzewiecki
Keyword(s):  
Circuit Design ◽  
Pressure Sensor ◽  
Solid Wall ◽  
Wheatstone Bridge ◽  
Temperature Sensitive ◽  
New Developments ◽  
Set Point ◽  
Output Pressure ◽  
Point Pressure ◽  
Controlling Element

This paper presents several new developments in fluidic circuit design. The use of orifices and capillaries, as input and feedback resistors, and vice-versa, in an operational amplifier circuit is shown to result in a scaler whose gain varies either directly or inversely in proportion to kinematic viscosity. When operating on a temperature sensitive gainblock this scalar can be used to compensate for the effects of variable ambient temperature. The orifice formed by the space between a jet and a solid wall is a pressure sensitive resistance that is used as the controlling element in a gain changer and an automatically null-balanced Wheatstone bridge. In a novel use of a laminar proportional amplifier (LPA), the nonlinear saturation characteristic is used to linearize inversely nonlinear sensor and circuit outputs. Finally a set-point pressure sensor, that is a highly asymmetric LPA, is described that develops a high differential output pressure as a function of power jet pressure which can be some set-point pressure. By using this device as a pressure sensor, an ultra-quiet, high suppression performance pressure regulator has been built and demonstrated.

Micro Double Pressure Sensor for Measuring the Applying Forces in Balloon Angioplasty

2013 ◽  
Author(s):  
Arman Dabiri
Keyword(s):  
Medical Device ◽  
Circuit Design ◽  
Balloon Angioplasty ◽  
Pressure Sensor ◽  
Wheatstone Bridge ◽  
Vascular Wall ◽  
Electrical Circuit ◽  
Mechanical Behaviors ◽  
Reaction Forces ◽  
Vessel Walls

This paper describes a new catheter based on double pressure sensor for measuring reaction forces of cardiovascular vessel walls in balloon angioplasty. This medical device is based on Wheatstone bridge and a passive transformer module. It assists cardiologists to measure reaction forces exiting between the catheter and the vascular wall. Reaction forces on the catheter can be grouped into two types: 1) reaction forces on the catheter head and 2) reaction forces between the balloon and the vascular wall. Its new proposed transducer module aids doctors decrease cardiology steps leading to the reduction of patients’ pains from inputting consecutive catheters into their bodies. Moreover, its special circuit design reduces needing wires for power supplying of the sensors, and simplifies the fabrication processes. Finally, mechanical behaviors of the sensor have been simulated in SolidWorks and its electrical circuit is modeled in Simulink\electrical. Also, Fabrication processes are projected in the final step of designing.

On the Modeling of the Wheatstone-Bridge Piezoresistive Pressure Sensor: A Finite-Element-Based Approach

1999 ◽  
Author(s):  
Chahid K. Ghaddar ◽  
John R. Gilbert
Keyword(s):  
Finite Element ◽  
Concentration Profile ◽  
Pressure Sensor ◽  
Dopant Concentration ◽  
Wheatstone Bridge ◽  
Design Parameters ◽  
Angular Orientation ◽  
Junction Depth ◽  
Piezoresistive Pressure Sensor ◽  
Limited Diffusion

Abstract In this work we conduct a number of finite element simulations using the MEMCAD 5.0 system to evaluate the effect of various geometrical and process parameters on the Wheatstone bridge piezoresistive pressure sensor. In particular, results are presented for the following design parameters: the location of the resistors relative to the diaphragm edge; the angular orientation of the resistors; the planar dimensions of the resistors; and finally, the effects of dopant concentration profile and associated junction depth as computed by the limited-diffusion model.

The Electricity Design of Pressure Sensor

2013 ◽  
Vol 438-439 ◽  
pp. 539-542
Author(s):  
Tao Li ◽  
Guo Jing Ren ◽  
Li Feng Qi ◽  
Zhi Min Liu
Keyword(s):  
Mechanical System ◽  
Pressure Sensor ◽  
Wheatstone Bridge ◽  
Micro Electro Mechanical System ◽  
Open Loop ◽  
Bridge Design ◽  
Piezoresistive Pressure Sensor ◽  
Working Principle

The relative discussion and research of Micro-Electro-Mechanical System (MEMS) and pressure sensor is carried out in this paper. The working principle of pressure sensor is analyzed, and the cantilever piezoresistive pressure sensor is studied in details. The electricity design of pressure sensor is researched. The open loop Wheatstone-bridge design is adopted in this paper, which adds the freedom of disposing circuit.

scholarly journals Pressure Sensor with New Electrical Circuit Utilizing Bipolar Junction Transistor

2021 ◽  
Author(s):  
Mikhail
Keyword(s):  
Theoretical Model ◽  
Pressure Sensor ◽  
High Sensitivity ◽  
Wheatstone Bridge ◽  
Electrical Circuit ◽  
Sensor Chip ◽  
Chip Size ◽  
Junction Transistor ◽  
Developed Pressure ◽  
P Type

High sensitivity MEMS pressure sensor chip for different ranges (1 to 60 kPa) utilizing the novel electrical circuit of piezosensitive differential amplifier with negative feedback loop (PDA-NFL) is developed. Pressure sensor chip PDA-NFL utilizes two bipolar-junction transistors (BJT) with vertical n-p-n type structure (V-NPN) and eight piezoresistors (p-type). Both theoretical model of sensor response to pressure and temperature and experimental data are presented. Data confirms the applicability of theoretical model. Introduction of the amplifier allows for decreasing chip size while keeping the same sensitivity as a chip with classic Wheatstone bridge circuit.

Thermoregulation: some concepts have changed. Functional architecture of the thermoregulatory system

2007 ◽  
Vol 292 (1) ◽  
pp. R37-R46 ◽  
Author(s):  
Andrej A. Romanovsky
Keyword(s):  
Transient Receptor Potential ◽  
Trp Channels ◽  
Receptor Potential ◽  
Open Loop ◽  
Temperature Sensitive ◽  
Functional Architecture ◽  
Set Point ◽  
Sequential Activation ◽  
Thermoregulatory System ◽  
Transient Receptor

While summarizing the current understanding of how body temperature (Tb) is regulated, this review discusses the recent progress in the following areas: central and peripheral thermosensitivity and temperature-activated transient receptor potential (TRP) channels; afferent neuronal pathways from peripheral thermosensors; and efferent thermoeffector pathways. It is proposed that activation of temperature-sensitive TRP channels is a mechanism of peripheral thermosensitivity. Special attention is paid to the functional architecture of the thermoregulatory system. The notion that deep Tb is regulated by a unified system with a single controller is rejected. It is proposed that Tb is regulated by independent thermoeffector loops, each having its own afferent and efferent branches. The activity of each thermoeffector is triggered by a unique combination of shell and core Tbs. Temperature-dependent phase transitions in thermosensory neurons cause sequential activation of all neurons of the corresponding thermoeffector loop and eventually a thermoeffector response. No computation of an integrated Tb or its comparison with an obvious or hidden set point of a unified system is necessary. Coordination between thermoeffectors is achieved through their common controlled variable, Tb. The described model incorporates Kobayashi’s views, but Kobayashi’s proposal to eliminate the term sensor is rejected. A case against the term set point is also made. Because this term is historically associated with a unified control system, it is more misleading than informative. The term balance point is proposed to designate the regulated level of Tb and to attract attention to the multiple feedback, feedforward, and open-loop components that contribute to thermal balance.

Study on Excitation Voltage Effects of the Thermal Excitation Resonant Pressure Sensor

2009 ◽  
Vol 60-61 ◽  
pp. 79-83 ◽  
Author(s):  
Xiao Wei Li ◽  
Zheng Yuan Zhang
Keyword(s):  
Resonant Frequency ◽  
Circuit Design ◽  
Pressure Sensor ◽  
Thermal Gradient ◽  
Open Loop ◽  
Gradient Field ◽  
Thermal Excitation ◽  
Test Experiment ◽  
Sensor Analysis ◽  
Lock In

Resonant pressure sensor, whose thermal gradient field is changed by variations in electro-thermal excitation, then influences the resonant frequency of the sensor, so different thermal excitation will produce different thermal stress, and then influences the characteristic of the sensor. For the thermal excitation resonant pressure sensor at different voltages excitant will produce different thermal gradient field, then influences the frequency of the sensor. Taking the advantage of lock-in amplifier, which can detect weak signal, an open-loop test experiment about the resonance output signal is carried out by using the method of alternating current excitation and pick-up with two-octave component. The results show the relational about thermal excitant virtual value and resonant frequency of this silicon microstructure resonant pressure sensor. Analysis about the result of the experiment is given, which can provide certain theories basis for the optimum design of the related parameter of this sensor, and have an important advice for the peripheral circuit design.

Geometric Optimization of van der Pauw Structure Based MEMS Pressure Sensor

2007 ◽  
Author(s):  
Jesse Law ◽  
Robert Cassel ◽  
Ahsan Mian
Keyword(s):  
Pressure Sensor ◽  
Silicon Crystal ◽  
Relative Size ◽  
Orientation Angle ◽  
Wheatstone Bridge ◽  
Geometric Optimization ◽  
Biaxial Stress ◽  
Mems Devices ◽  
Piezoresistive Sensor ◽  
Van Der Pauw

This paper characterizes a piezoresistive sensor under variations of both size and orientation with respect to the silicon crystal lattice for its application to MEMS pressure sensing. The sensor to be studied is a four-terminal piezoresistive sensor commonly referred to as a van der Pauw (VDP) structure. In a recent study, our team has determined the relation between the biaxial stress state and the piezoresistive response of a VDP structure by combining the VDP resistance equations with the equations governing silicon piezoresistivity and has proposed a novel piezoresistive pressure sensor. It is observed that the sensitivity of the VDP sensor is over three times higher than the conventional filament type Wheatstone bridge resistor. With MEMS devices being used in applications which continually necessitate smaller size, characterizing the effect of relative size and misalignment on the sensitivity of the VDP sensor is important. It is determined that the performance of the sensor is strongly dependent only on the longitudinal position of the sensor on the diaphragm, and is relatively tolerant of other errors in the manufacturing process such as transverse position, sensor depth, and orientation angle.

Compensation Research of Engine Oil Pressure Sensor Based on MEMS

2013 ◽  
Vol 325-326 ◽  
pp. 765-768
Author(s):  
Sheng Bing Yang ◽  
Shuai Wang ◽  
Yan Xia Su ◽  
Feng Xu ◽  
Zhen Zhen Li
Keyword(s):  
Pressure Sensor ◽  
Temperature Compensation ◽  
Output Voltage ◽  
Zero Point ◽  
Engine Oil ◽  
Lubrication System ◽  
Working Process ◽  
Point Pressure ◽  
Process Engine ◽  
Pressure Compensation

The engine lubrication system plays an important role in the engine working process. Engine electronic oil pressure sensor based on piezoresistor pressure sensor MEMS with contactless measure technology is designed in this paper. This sensor includes a signal disposal chip which provides zero point pressure compensation, temperature compensation and sensitivity compensation and a chip which is used to adjust the duty cycle according to the output voltage of the signal disposal chip. The experiments show that the Engine electronic oil pressure sensor works well with excellent characteristic.

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