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Home / Tutorials / Strain Gauge
Strain Gauge Last Updated on April 7, 2010 by john in Tutorials with 4 Comments
GEORGIN Régulateurs Pressure transmitters specialist for harsh environment
A strain gauge is a device that is used to measure the strain that occurs in an object. The device was invented in the year 1938 by Edward E. Simmons and Arthur Ruge. The device is still being used in many electronic circuits mainly as the principle sensing element for sensors like torque sensors, pressure sensors, load cells and so on.
AMTI t Simulators Multiaxis t simulators and biomedical testing machines www.amti.biz
Strain Gauge working
Strain Gauge Working Principle Although strain gauges are available in many shapes and sizes, the fundamental working of this device is the same. They also vary in both shape and size according to their field of application. A strain gauge consists of a foil of resistive characteristics, which is safely mounted on a backing material. When a known amount of stress http://www.circuitstoday.com/straingauge
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1/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
in subjected on the resistive foil, the resistance of the foil changes accordingly. Thus, there is a relation between the change in the
Subscribe
resistance and the strain applied. This relation is known by a quantity called gauge factor. The change in the resistance can be calculated with the help of a Wheatstone bridge. TAKE A LOOK : WHEATSTONE BRIDGE
Categories
The strain gauge used is connected to the Wheatstone bridge with the
101-Announcements
(24)
help of an adhesive called cyanocrylate.
555 Timer IC
(14)
8051
(21)
conductivity of the conductor, but also in the size and shape of the
8051 projects
(16)
conductor used. As a matter of fact, the electrical conductivity also
Amplifier Circuits
(39)
Arduino
(28)
The property of the strain gauge not only depends on the electrical
depends on the electrical conductance of the foil. This, in turn depends on the material of the conductor. The electrical resistance of the foil changes according to the change in the foil when it is stretched or compressed. The stretching or compressing is considered normal as long as there is no permanent change in the original appearance of the foil. Stretching causes an increase in the resistance from one end to other. Compressing causes a decrease in the resistance from one end of the conductor to another. Basically, the conductor will be a long strip with parallel lines with the condition that a little stress in the path of the orientation of the parallel lines will cause a resultant bigger strain multiplicatively over the effective length of the conductor. Thus a larger resistance change will be obtained.
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The force applied to change elongate or shorten the strip can also be calculated with the help of the obtained output resistance.
Education & Training Electronic Components
(30)
An ideal strain gauge resistance varies from a few 3 ohms to 3 kilo ohms when it is unstressed. This value will change by a small fraction for the full force range of the gauge. It also depends on the elastic limits of the foil material. If there are forces applied to such an extent that they lose their original shape and size, the strain gauge will no longer be fit to use as a measuring device. So measurement of small fractional changes in the resistance must be taken accurately in order
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Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
to use the strain gauge as a measuring device.
Applications The voltage output in accordance to the stress is about a few millivolts. This voltage can be amplified to about 10 volts and can be applied to external data collection systems like recorders or PC data acquisition and analysis systems. Strain gauges can be used to measure the stress developed in particular machinery and thus is used to mechanical engg. R&D.
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Instruments
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Gauge Factor Equation
Integrated Circuits
(20)
The gauge factor of a strain gauge is given be the equation
Inverters
The device is used aircraft component testing. Here also the measure of stress is the main issue. For this, strain gauges of very small size are connected to structural , linkages and so on.
GF = [∆R/RG]/E ∆R – Resistance produced by the strain RG – Resistance of gauge before application of stress E – Strain produced
Types of Strain Gauges This classification is based on the type of bridge circuit that is connected to the strain gauge. There are mainly three types of connections. They are
(5)
Lab Manuals
(20)
LED related
(3)
Light Related
(14)
Lighting Circuits
(43)
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(3)
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(1)
Motor Related
(14)
Nanotechnology
(14)
Oscillators
(25)
Peripheral Interface Controller (29) (PIC)
1. Quarter Bridge Strain Gauge Circuit As shown in the diagram below, the imbalance is detected by the voltmeter in the center of the bridge circuit. The resistance R2 will be a rheostat and hence adjustable. The value of this resistance is made equal to the strain gauge resistance without the application of any force. The resistances R1 and R3 will have equal values. Thus, according to the Wheatstone bridge principle the entire circuit will be balanced and the net force will be zero. Thus the strain will also be zero. Now provide a compression or tension on the conductor and the circuit will be imbalanced. Thus you will get a reading at the voltmeter. Thus, the strain produced in response to the measured variable (mechanical force), is known as a quarter-bridge circuit. http://www.circuitstoday.com/straingauge
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Quarter bridge strain circuit
2. Half Bridge Strain Gauge Circuit As shown in the circuit there are two strain gauges connected. If one of them does not respond to the strain produced it becomes a quarter bridge circuit. If both of them respond in such a way that both the strain gauges experience opposite forces it becomes a half bridge strain gauge circuit. By opposite forces, we mean that a compression on the upper strain gauge makes a stretch on the lower strain gauge. This causes both the gauges to make a better response to strain, thus increasing the response of the bridge to the applied force. As both the strain gauges act opposite and proportionally the response to the changes in temperature will be cancelled thus reducing the errors due to it.
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(1)
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(2)
Switching Circuits
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(87)
Telephone Related
(9)
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(4)
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(3)
Test & Measurement Circuits
(38)
Testing Components
(9)
Three phase circuits
(1)
Timer Circuits
(3)
Tone generator circuits
(20)
Tools and Softwares
(6)
Transmitters
(7)
Tutorials
Half bridge strain gauge circuit
(12)
(158)
UPS
(2)
USB Circuits
(3)
Videos
(5)
VLSI
(36)
Voltage Regulators
(15)
3. Full Bridge Strain Gauge Circuit In the case of sensitivity, a half bridge strain circuit is more sensitive than a quarter bridge circuit. The sensitivity can be increased if all the elements of the bridge are active. Such a circuit is called full bridge strain gauge circuit. The circuit is also advantageous in the fact that it can be used to bond the complimentary pairs of strain gauges to the testing specimen. Thus, this is considered to be the best bridge circuit for strain measurement. The circuit is also advantageous because of its linearity. That is, the output voltage is exactly directly proportional to http://www.circuitstoday.com/straingauge
4/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
the applied force. But in the case of a half bridge and quarter bridge the output voltage is only approximately proportional to the applied force. Take a look at the circuit diagram given below.
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4 thoughts on “Strain Gauge”
28,681 likes
Seetharaman September 19, 2010 at 9:31 am Hi JE kindly go through Vishay site http://www.vishaypg.com/process-weighing/products/load-cellmodule-force-transducers/load-cells/
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Be the first of your friends to like this Reply
junior engineer September 19, 2010 at 4:24 am Hi there.. i’m new in this field, so i want to ask one question, may be the easy question.. can u give some explanation about effective length of strain gauge?? i getting confused.. thank you for your guide Reply
suhail on Digital Code Lock using Arduino with LCD Display and Defined
jawid akhtar March 20, 2010 at 9:35 am Dear Author. Hope you are doing fine. Cn you please send me a complete practical electronic schematic of 1000watt ups based on PWM IC. Thanks Reply
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About
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Home / Tutorials / Strain Gauge
Strain Gauge Last Updated on April 7, 2010 by john in Tutorials with 4 Comments
GEORGIN Régulateurs Pressure transmitters specialist for harsh environment
A strain gauge is a device that is used to measure the strain that occurs in an object. The device was invented in the year 1938 by Edward E. Simmons and Arthur Ruge. The device is still being used in many electronic circuits mainly as the principle sensing element for sensors like torque sensors, pressure sensors, load cells and so on.
AMTI t Simulators Multiaxis t simulators and biomedical testing machines www.amti.biz
Strain Gauge working
Strain Gauge Working Principle Although strain gauges are available in many shapes and sizes, the fundamental working of this device is the same. They also vary in both shape and size according to their field of application. A strain gauge consists of a foil of resistive characteristics, which is safely mounted on a backing material. When a known amount of stress http://www.circuitstoday.com/straingauge
Get Daily Updates via Email Enter your email
1/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
in subjected on the resistive foil, the resistance of the foil changes accordingly. Thus, there is a relation between the change in the
Subscribe
resistance and the strain applied. This relation is known by a quantity called gauge factor. The change in the resistance can be calculated with the help of a Wheatstone bridge. TAKE A LOOK : WHEATSTONE BRIDGE
Categories
The strain gauge used is connected to the Wheatstone bridge with the
101-Announcements
(24)
help of an adhesive called cyanocrylate.
555 Timer IC
(14)
8051
(21)
conductivity of the conductor, but also in the size and shape of the
8051 projects
(16)
conductor used. As a matter of fact, the electrical conductivity also
Amplifier Circuits
(39)
Arduino
(28)
The property of the strain gauge not only depends on the electrical
depends on the electrical conductance of the foil. This, in turn depends on the material of the conductor. The electrical resistance of the foil changes according to the change in the foil when it is stretched or compressed. The stretching or compressing is considered normal as long as there is no permanent change in the original appearance of the foil. Stretching causes an increase in the resistance from one end to other. Compressing causes a decrease in the resistance from one end of the conductor to another. Basically, the conductor will be a long strip with parallel lines with the condition that a little stress in the path of the orientation of the parallel lines will cause a resultant bigger strain multiplicatively over the effective length of the conductor. Thus a larger resistance change will be obtained.
Audio Circuits
(104)
Automotive Circuits
(28)
AVR
(15)
Basic Electricity
(1)
Basic Electronics
(6)
Battery Circuits
(23)
C plus plus
(7)
C Programming
(14)
Cable TV Circuits
(1)
Camera Technology
(5)
Clipping and Clamping Circuits
(7)
Clocking & Timer Circuits
(2)
Conversion Circuits
(10)
Counter Circuits
(2)
Counters
(2)
Digital Electronics
(11)
The force applied to change elongate or shorten the strip can also be calculated with the help of the obtained output resistance.
Education & Training Electronic Components
(30)
An ideal strain gauge resistance varies from a few 3 ohms to 3 kilo ohms when it is unstressed. This value will change by a small fraction for the full force range of the gauge. It also depends on the elastic limits of the foil material. If there are forces applied to such an extent that they lose their original shape and size, the strain gauge will no longer be fit to use as a measuring device. So measurement of small fractional changes in the resistance must be taken accurately in order
Electronic Keys & Locks
(3)
http://www.circuitstoday.com/straingauge
Electronics Books
(6)
(10)
Electronics Jobs
(4)
Embedded Systems
(7)
Equipment Reviews
(1) 2/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
to use the strain gauge as a measuring device.
Applications The voltage output in accordance to the stress is about a few millivolts. This voltage can be amplified to about 10 volts and can be applied to external data collection systems like recorders or PC data acquisition and analysis systems. Strain gauges can be used to measure the stress developed in particular machinery and thus is used to mechanical engg. R&D.
Events
(3)
Fan Circuits
(1)
Filter Circuits Fire Alarm Fun & Game Circuits
(16) (3) (14)
Gadget Reviews
(5)
Ham Radio Circuits
(2)
High Voltage Circuits
(1)
History
(26)
Home Circuits
(35)
Industrial Circuits
(15)
Instruments
(12)
Gauge Factor Equation
Integrated Circuits
(20)
The gauge factor of a strain gauge is given be the equation
Inverters
The device is used aircraft component testing. Here also the measure of stress is the main issue. For this, strain gauges of very small size are connected to structural , linkages and so on.
GF = [∆R/RG]/E ∆R – Resistance produced by the strain RG – Resistance of gauge before application of stress E – Strain produced
Types of Strain Gauges This classification is based on the type of bridge circuit that is connected to the strain gauge. There are mainly three types of connections. They are
(5)
Lab Manuals
(20)
LED related
(3)
Light Related
(14)
Lighting Circuits
(43)
MATLAB
(3)
Microcontrollers
(7)
Mobile Phone Related
(1)
Motor Related
(14)
Nanotechnology
(14)
Oscillators
(25)
Peripheral Interface Controller (29) (PIC)
1. Quarter Bridge Strain Gauge Circuit As shown in the diagram below, the imbalance is detected by the voltmeter in the center of the bridge circuit. The resistance R2 will be a rheostat and hence adjustable. The value of this resistance is made equal to the strain gauge resistance without the application of any force. The resistances R1 and R3 will have equal values. Thus, according to the Wheatstone bridge principle the entire circuit will be balanced and the net force will be zero. Thus the strain will also be zero. Now provide a compression or tension on the conductor and the circuit will be imbalanced. Thus you will get a reading at the voltmeter. Thus, the strain produced in response to the measured variable (mechanical force), is known as a quarter-bridge circuit. http://www.circuitstoday.com/straingauge
Power Controller Circuits
(8)
Power Electronics
(2)
Power Supplies
(72)
Project Ideas
(1)
Projects
(7)
Proximity Detectors
(3)
Radio Circuits
(30)
Radio Transmitters
(19)
Raspberry Pi
(1)
Relays
(3) 3/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
Remote Circuits
Quarter bridge strain circuit
2. Half Bridge Strain Gauge Circuit As shown in the circuit there are two strain gauges connected. If one of them does not respond to the strain produced it becomes a quarter bridge circuit. If both of them respond in such a way that both the strain gauges experience opposite forces it becomes a half bridge strain gauge circuit. By opposite forces, we mean that a compression on the upper strain gauge makes a stretch on the lower strain gauge. This causes both the gauges to make a better response to strain, thus increasing the response of the bridge to the applied force. As both the strain gauges act opposite and proportionally the response to the changes in temperature will be cancelled thus reducing the errors due to it.
Reviews
(4)
Robotics
(6)
RTOS
(2)
Security & Saftey
(16)
Sensor Circuits
(16)
Signal Conditioners
(11)
Signal Generators
(13)
Speed Controller Circuits
(1)
State space analysis
(2)
Switching Circuits
(6)
Tech News
(87)
Telephone Related
(9)
Television Related
(4)
Temperature Related
(3)
Test & Measurement Circuits
(38)
Testing Components
(9)
Three phase circuits
(1)
Timer Circuits
(3)
Tone generator circuits
(20)
Tools and Softwares
(6)
Transmitters
(7)
Tutorials
Half bridge strain gauge circuit
(12)
(158)
UPS
(2)
USB Circuits
(3)
Videos
(5)
VLSI
(36)
Voltage Regulators
(15)
3. Full Bridge Strain Gauge Circuit In the case of sensitivity, a half bridge strain circuit is more sensitive than a quarter bridge circuit. The sensitivity can be increased if all the elements of the bridge are active. Such a circuit is called full bridge strain gauge circuit. The circuit is also advantageous in the fact that it can be used to bond the complimentary pairs of strain gauges to the testing specimen. Thus, this is considered to be the best bridge circuit for strain measurement. The circuit is also advantageous because of its linearity. That is, the output voltage is exactly directly proportional to http://www.circuitstoday.com/straingauge
4/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
the applied force. But in the case of a half bridge and quarter bridge the output voltage is only approximately proportional to the applied force. Take a look at the circuit diagram given below.
Latest Articles Humidity sensor using 8051 RFID Based Access Control System
Full bridge strain gauge circuit
using 8051 Microcontroller Based Programmable Data-cumTemperature Display
Buat Situs Web Bisnis Semudah Mengedit Dokumen Dengan Google Sites. Gratis 30 Hari!
LiPo battery charger circuit. Nest Thermostat Review Amazon Echo Review – Is it worth the hype?
You may also like: Resistor Color Code Chart – Understanding Resistance Color Coding How to debug in Keil Microvision
Ultrasonic water level controller using 8051 How to Build PCB Online using Web Based EDA Tools
Getting Started with Keil uVision Bit rate Vs Baud rate – the common misconception How to recover/reset name and of Vbulletin forum software
Interfacing RFID to 8051microcontroller Interfacing PIR sensor to 8051
Like Us on Facebook
We recommend: What are the Different Types of LED's available Beat Frequency Oscillator (BFO) 5V power supply using 7805. Voltage Controlled Oscillator How improving page load speed can increase your website traffic and experience
Ads by Google
► Strain Gauge
http://www.circuitstoday.com/straingauge
► Circuit
► Circuit IC 5/8
1/15/2016
Strain Gauge Electronic Circuits and DiagramElectronics Projects and Design
Circuitstoday.com
4 thoughts on “Strain Gauge”
28,681 likes
Seetharaman September 19, 2010 at 9:31 am Hi JE kindly go through Vishay site http://www.vishaypg.com/process-weighing/products/load-cellmodule-force-transducers/load-cells/
Like Page
Shop Now
Be the first of your friends to like this Reply
junior engineer September 19, 2010 at 4:24 am Hi there.. i’m new in this field, so i want to ask one question, may be the easy question.. can u give some explanation about effective length of strain gauge?? i getting confused.. thank you for your guide Reply
suhail on Digital Code Lock using Arduino with LCD Display and Defined
jawid akhtar March 20, 2010 at 9:35 am Dear Author. Hope you are doing fine. Cn you please send me a complete practical electronic schematic of 1000watt ups based on PWM IC. Thanks Reply
Pingback: Model Train Information |
Leave a Reply Your email address will not be published. Required fields are marked * Name *
Recent Comments
suhail on Digital Code Lock using Arduino with LCD Display and Defined Abhijit on ISP Programmer for ATmega32 Microcontroller rakesh on ISP Programmer for ATmega32 Microcontroller Abhijit on ISP Programmer for ATmega32 Microcontroller suhail on Digital Code Lock using Arduino with LCD Display and Defined Amol Todawat on SCR-Principle of Operation
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Amol Todawat on SCR-Principle of Operation Ahmad on Automatic Wiper Control Circuit
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Comment
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