What is a Vibration Sensor?

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⌚Timestamps:
00:00 - Industrial Vibration Definition
01:34 - Industrial Vibration Types
02:37 - Accelerometer Introduction
03:05 - High Impedance Accelerometer
03:22 - Low Impedance Accelerometer
03:44 - Strain Gauge Vibration Sensor
04:37 - Eddy-Current Vibration Sensor
05:38 - Vibration Sensor Selection
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In this video, we are going to talk about the different types of vibration, the different types of vibration sensors, and how to choose a vibration sensor based on parameters.
Vibration can be defined as the mechanical oscillation about an equilibrium position of a machine or component. Or simply the back and forth motion of a machine or component.
Vibration in industrial equipment is sometimes part of the normal operation but sometimes it can be a sign of trouble.
In machine monitoring we are dealing with two types of vibration; Axial (or Thrust) Vibration and Radial Vibration.
“Axial” Vibration is a longitudinal shafting vibration or parallel to the shaft of a motor.
“Radial” Vibration occurs as a force applied outward from the shaft.
Accelerometers are devices that measure the vibration, or acceleration of motion of a structure.
They have a transducer that converts mechanical force caused by vibration or a change in motion into an electrical current using the piezoelectric effect.
There are two types of piezoelectric accelerometers, high impedance, and low impedance.
High impedance accelerometers produce an electrical charge which is connected directly to the measurement instruments.
They require special accommodations and instrumentation so they are found in research facilities or high-temperature applications.
Low impedance accelerometers have a charge accelerometer as its front end as well as a built-in micro-circuit and transistor that converts that charge into a low impedance voltage.
This type of accelerometer easily interfaces with standard instrumentation which makes it commonly used in the industry.
A strain gauge is a sensor whose resistance varies with applied force; It converts force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured.
When external forces are applied to a stationary object, stress and strain are the results.
When there is a strain applied to any metallic wire the length of that wire increases and the diameter decrease.
This increase in length and decrease in diameter will change the resistance of the wire which will give us our measurement of strain on our machine component.
Eddy-Current sensors are non-contact devices that measure the position and/or change of position of a conductive component. These sensors operate with magnetic fields.
The sensor has a probe which creates an alternating current at the tip of the probe. The alternating current creates small currents in the component we are monitoring called eddy currents.
The sensor monitors the interaction of these two magnetic fields. As the field interaction changes the sensor will produce a voltage proportional to the change in the interaction of the two fields.
When using Eddy-Current sensors it is important for the component to be at least three times larger than the sensor diameter for normal operation; otherwise, advanced calibration would be required.
When choosing a vibration sensor for your application it is important to look at factors such as; range and accuracy, environment conditions, and the shape of the measuring surface.
Out of the three sensors that we have discussed the accelerometer is the most common because it has a good range of frequency.
Along with the frequency, accelerometers are priced affordably and are durable. They do have to be mounted directly to the machine which is common for vibration sensors.
Eddy current or capacitive sensors have medium accuracy and are not optimal for high-resolution applications. They are very durable making them a good option for dirty environments.
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#RealPars #VibrationSensor #Sensor

[@gembiehamumpa9710]

Hi I'm from Papua New Guinea neighbor to Australia. These video lectures n tutorials are helping me quite alot.Thanks .Have been working around in the mining industry in PNG for quite awhile.

[@realpars]

Hi Gembie, Thanks for your comment and great to hear that our courses have been so useful to you! In that case, I am sure our course library would be very interesting for you as well. Feel free to have a browse around through our course library to see which topics we cover at the moment. bit.ly/30ZrxWq Just to let you know, that we also have a free course on PLC Hardware bit.ly/2XnnUrF Happy learning! Feel free to reach out if you have any questions along the way!

[@priyomgoswami4327]

The way you explained in all your videos is quite phenomenal. Loved it.

[@realpars]

That's amazing! Thanks for your support.

[@priyomgoswami4327]

@@realpars Can You help me know, in case of gearbox monitoring using accelerometers, where should we place the sensor on the Gearbox?

[@Blades-fm6ck]

Really useful video. Very well thought-out explanation starting with fundamental definition of vibration and advancing on from there. Perfect.

[@realpars]

Glad it was helpful!

[@sameersalem1827]

Really I love and appreciate all your works thank you very much .

[@realpars]

Great to hear that, Sameer! Thanks a lot for your support.

[@fayssalcheriet328]

Thank you, i admire your work and i am gratefull for all the lessons you provided for us, really every minute of your videos is rich with information, in this video in particularly i'm intrested more in the accelerometer i'll be thankfull if you posted more about this subject and how its work and the theory of piezoelectric. thank you one more time. wich you all the best.

[@realpars]

Thanks for your support, Fayssal! Happy to hear that you have enjoyed this course video so much! Happy learning!

[@muhammadosama8308]

Visual explanation makes it so much easier and easy to learn thanks alot!.

[@realpars]

Great to hear that! Thanks for your support.

[@mariani0344]

Yes, thanks!... Realpars for this channel.... I am a visual learner and seeing these awesome videos help me grasp and comprehend a lot more what I read on my textbooks.

[@vetrivel9995]

Very thankful sir... More confusion about vibration now clear....

[@realpars]

Great to hear that, Vetri!

[@chaurasiyaarunkumar]

Thanks for most important information & clearly mentioned types and when we can use it's.

[@realpars]

Happy to hear that it was helpful! Thanks for your support

[@stevenlee5755]

Great job!!!Thanks for the share

[@realpars]

Thank you!

[@calibrationtracking3293]

Awesome video.Very informative.

[@realpars]

Amazing to hear that! Thanks a lot!

[@melquiadesdelgadoramirez680]

Because I've always worked with rotating equipment like motors and pumps, I've always seen accelerometers in such equipments. It's good to know there are other types of vibration sensors and their principle of operation. Thanks RealPars

[@realpars]

Thanks for sharing, Melquîades!

[@christopheremanuel5063]

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[@owenwalter8698]

@Christopher Emanuel Instablaster ;)

[@christopheremanuel5063]

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@Owen Walter it did the trick and I now got access to my account again. Im so happy! Thank you so much, you saved my account!

[@engsam2208]

Thanks for this vid.

[@realpars]

You are very welcome!

[@farzadfani4688]

Hi thanks for your great training video. Please make video about programming vibration controll and vibration monitoring system.

[@realpars]

Thank you, Farzad! I will surely add it to the list.

[@AMANSHARMA-bl5ui]

Great informative video

[@realpars]

Thanks a lot!

[@mohamadnajm1465]

Amazing Video Correction: For Eddy Current Senor - Its not Capacitive Displacement Sensor - Its Inductive Displacement Sensor using Magnetic field As the sensing Field With The inductor Coil Charged With AC Current

[@user-wu1lp2lr6w]

Very good information, thank you ....

[@realpars]

You are welcome!

[@rushikeshthakare3844]

Thanks for good information sir

[@realpars]

You are very welcome! Happy learning.

[@openclose93]

Thanks

[@shubhamdubey3585]

Useful and nice video keep it up!!!!!!!

[@realpars]

Hi Shubham, Thanks a lot for your comment. Happy to hear that you are enjoying our video courses. Keep up the learning curve!

[@ashikazarudeen508]

Good explanation about vibration concept

[@realpars]

Thank you!

[@EkcommanMan-hc4vd]

Thank you so much sir

[@jaimezuleta8125]

Excellent video.

[@technicianengtestsolut8723]

very usefull and educational video

[@realpars]

Great to hear that! Thanks for sharing!

[@lucianomonteiro8392]

Very good video.

[@realpars]

Thank you very much!

[@abdulrahmanmahmoud1371]

Very nice

[@realpars]

Thank you, Abdulrahman!

[@gunadharmajhi7699]

I salute you sir good information sir

[@realpars]

Thank you, Gunadhar!

[@yuvarajaannavaram5420]

It is very useful for knowing people

[@stevenlee5755]

Is there any requirement of Industrial Control Products? www.cntopstock.com

[@vivekramanandi3321]

Nice introduction 😀

[@realpars]

Thank you!

[@brunomartel4639]

please guys add auto-generated subs,the normal subs lag behind when video accelerated,awesome work!

[@realpars]

Thanks for the feedback, Bruno! We appreciate that.

[@prio_desh8381]

Brilliant

[@realpars]

Thank you!

[@shahidnazir6080]

pls make detailed video on safety barriers on instrumentation & on grounding

[@realpars]

Hi Shahid! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@knorrtetteh1701]

I over love this video...but the duration is short. Thanks for the education

[@realpars]

Great to hear that, Knorr! You are very welcome. Have you had a chance to check out our free course on PLC Hardware? bit.ly/2XnnUrF I am sure you will enjoy that as well. Happy learning!

[@stevenlee5755]

Is there any requirement of Industrial Control Products? www.cntopstock.com

[@asv62]

helpful video thanks Realpars. what kind of sensors do you recommend for monitoring industrial buildings against earthquake ? or the building need seismic ?

[@realpars]

A building is designed to withstand an earthquake of a certain magnitude, per local building codes. There are earthquake monitoring stations that will warn and advise on earthquake activity. That said, for tall buildings, some governments have been exploring the use of acceleration sensors that can be fixed to a structure with a single central bolt. One such device is Gecko Pro SMA-HR which is a High-Resolution Strong Motion Accelerograph

[@radhakrishna1008]

Very nice...

[@realpars]

Thank you, Mayank!

[@stevenlee5755]

Is there any requirement of Industrial Control Products? www.cntopstock.com

[@victoriacollegeinstrumenta4968]

A couple of technical issues that should be reviewed. Video time 1:55-2:24 is demonstrating axial and radial vibration scenarios. The first (1:55) shows the misalignment of the driver to the load. This is causing a "wobbling" effect which is primarily radial vibration and not axial. Some axial movement is going to be seen as a result of this misalignment. The second example (2:07) shows a driver with a fan load. The fan has a deformed fan blade causing a "wobble" and it definitely will be seen in the radial vibration proximitors. But the narrator says "the deformed fan blade would pull outwardly on the shaft of the motor, which is NOT a radial but an axial movement in the shaft. Video time 5:13 is demonstrating the gap / gap voltage when the gap increases. The video shows the gap increasing and simultaneously the voltmeter value decreasing, which is not correct. My feedback is for the objective of correctness for your viewers and not to be critical. I know from experience that editing / mis-editing can cause these types of mistakes. I am a fan of Realpars videos. I salute your endeavors / hard work in producing educational videos in the field of Instrumentation & Control Systems. If I have misunderstood the info, as presented, I will stand corrected. Thanks Pappy

[@realpars]

Thank you, Pappy, for your comments. After watching the video, I agree with your assessment, and I will see if we can have the narration modified.

[@AashishBharat]

Good video

[@realpars]

Thank you!

[@AashishBharat]

@@realpars hi, please provide me with some information. If I was to install a Differential pressure flowmeter to measure Gas flow but I don't have space to install the meter above the pipe to prevent condensables, how should I install the meter to obtain accurate gas flow?

[@peterkiboi4149]

Best free trainers on the net

[@realpars]

Thanks for your support, great to hear that!

[@Structuralmechanic]

Hello there, if I am interested in measuring only dynamic acceleration instead of static acceleration, which acclerometers do you suggest. Thank you!

[@realpars]

You need to match the particular sensor to your application, but in general, a DC capacitive MEMS (Microelectromechanical system) sensor will be a good choice for machine vibration detection. A DC piezoresistive MEMS sensor may be best for impact type applications (crash tests, bounce plates, etc.).

[@Jadfitree]

Correct me if Im wrong but that Radial and Axial vibration seems to be vice versa at 1:55

[@realpars]

Thank you for your question. Axial and radial vibration are depicted correctly in the video. Axial vibration occurs when a shaft is misaligned, and the vibration occurs parallel to the axis of rotation. The important concept is that vibration of any kind due to imbalances is detrimental to performance.

[@maamoonabdulkareem1067]

hi it is a good presentation about vibration sensors, how can we calibrate portable vibration meters

[@realpars]

Thanks a lot, Maamoon!

[@muhammadosama8308]

Small question. Wouldnt the bearings on the machine be able to absorb the axial and radial vibrations?.

[@realpars]

Yes, they would. But prolonged vibration can weaken and damage the bearings. We measure vibration so that we can insure the magnitude of vibration is not so large as to cause bearing, shaft, or other mechanical damage.

[@markiakhouas3898]

Hello, Please Can I have other exemple of a model vibration sensor which can resist fo very high temperatures? Like EX600B-13? thank you

[@realpars]

Hi Markia! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@zenmirae93]

What vibration sensor would you suggest if i want to measure vibration in a small dc motor?

[@realpars]

There are many different options. ifm Efector, Dwyer, Keyence, and others make very reliable vibration sensors for detecting vibration in small motors. Make sure the one you select reports the vibration data to your control system in the format that is compatible with your system: 4-20ma, 24 VDC, etc.

[@TheCetarius]

Does a Accelerometer measure the axial and radial vibration or does it depend on how the sensor is mounted?

[@realpars]

A single accelerometer will measure vibration in one plane. Therefore, what gets measured does depend on n how the sensor is mounted.

[@Graham_Wideman]

2:00 The narrator describes an axial vibration but the animation shows a radial vibration. 4:40, the narrator describes an eddy current sensor as capacitive, when actually it's inductive, and distinctly different from capacitive sensors.

[@realpars]

Thank you for your comments. Although not a perfect illustration, the vibration shown at 2:00 does have a strong component of axial vibration. And yes, also a component of radial vibration. At 4:40, the term should have been proximity sensor, not conductive.

[@radouanecroft2991]

hello sir as a trainee on my final internship, i'm working on a project concerning vibrational analysis, i would like to have your suggestions about the equipements that i require, knowing that i'm gonna use an accelerometer for measuring vibrations

[@tradalotaibi6550]

Oil transfer Pump is a good choose

[@jamest4198]

Can an accelerometer be used to place on a cd player chassis to measure the vibration level? Would this work if i wanted to compare vibration levels of different cd players etc?

[@realpars]

I would assume it is possible, but you would need a very small and precise sensor to measure vibration. I assume you want to measure the vibration of the rotating disk. Most CD players have a very small amount of vibration, mainly caused by the motion of the read/write heads. I will admit i have not heard of anyone doing this, so best of luck and let us know when you have it working!

[@cesarandressernamendoza4159]

¿ What kind of vibration sensor do you recommend that I can use to analyze vibration in rotating machines with Arduino?

[@technophilia2229]

Accelerometer

[@technophilia2229]

Better u can do with labview or matlab

[@unfilteredwithprakash6970]

Do you provide any certificate for PLC training (?)

[@realpars]

Hi there, You can certainly purchase our Certificate of Completion once you have completed at least 280 video courses. You can find more information about that here bit.ly/2LADnPY Let me know if you have any further questions, happy to help!

[@xoliletshokotshela2881]

Im gona werk on the vibrations i would like to learn more

[@Binuchempath]

Allen Bradley calibration using TK-3 please make a video

[@realpars]

Hey! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@belajarbiola1092]

Can i use strain gauge as contact microphone, like i use piezo buzzer? Thanks

[@realpars]

Yes. This is essentially how a electric guitar "pickup" works.

[@belajarbiola1092]

@@realpars thanks i'll try to make it, i hope it will works for my violin

[@omeronce3373]

i need to find the capacitive vibration sensor datasheet but i can't find it. do you know the model number?

[@realpars]

An example data sheet can be found here: www.ifm.com/us/en/product/VSP01A?tab=details

[@elainekent6821]

Different Types of Vibration Sensors

[@cck0728]

Eddy current sensors are same as proximity probes?

[@realpars]

Yes, eddy current sensors are also called inductive sensors, and they are often used for proximity detection.

[@rajeshbanjara2337]

please make video on thyristor in dc drive

[@realpars]

Hi Rajesh, Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@ramniranjanmaurya4124]

its magical sensor

[@Zuwwar]

Why is Eddy Current Sensor called a Capacitive Displacement Sensor because it actually works using a Magnetic Field so why capacitive displacement?

[@automationcontrolacademy3772]

What is the unit of vibration??

[@alejandrop9949]

Could be acceleration, velocity or displacement thus m/s2, mm/s or mm. You may also find imperial units, as G's, ips, or mils.

[@rejithretnan8365]

Are vibrational sensors and acoustic sensor the same?

[@realpars]

Yes, acoustic sensors can be used for vibration detection. However, only vibrations that generate surface acoustical waves can be detected by some acoustical sensors, so you need to make sure your sensors are suitable for the types of vibration that you need to measure.

[@mostofakamal6887]

Please give one video ach control system a to z

[@realpars]

Thanks for the topic suggestion! I will happily pass this on to our course developers.

[@techs5384]

Nice to see the old format again. Please stop the live streams and comment pruning.

[@realpars]

Thanks for the feedback! We will definitely keep the current format. However, we may also post some different formats as bonus content. For the last live stream, we were at an industrial area and the internet speed was not that great for doing this. That's why the quality was not that good.

[@techs5384]

RealPars the quality issue was the content not the bandwidth.

[@9907007013]

What is the difference between velocity and acceleration vibration measurement

[@realpars]

Measurement of vibration takes into account three measurements: Displacement, the amplitude (distance) between the peaks of vibration; velocity, the changing rate of displacement (D) to time; acceleration, the changing rate of velocity(V) to time. Modern vibration detectors are typically accelerometers, since the acceleration measurement can be used to calculate velocity and displacement. Vibration can be caused by piping or support vibration (displacement), imbalance, misalignment or coupling issues (velocity), and bearing damage, cavitition, gear misalignment (acceleration). By using an accelerometer and a good set of electronics, abnormal vibration in each of these regimes can be detected.

[@gembiehamumpa9710]

Hi I'm From Papua New Guinea neighbor to Australia. I'm learning quite alot from these video tutorials n lectures.Have been working around in mining in PNG for a while.

[@henm4975]

i left my last job because they refused to do this, they kept running the motor till something broke. It was infuriating to see and hear. they hid behind being older than me to downplay the problem. next thing you know the company shut down for 14 days because they failed to listen to me. They did this because they are in a heavy subsidized industry (renewables) so, if they loose money they can ask more from the rest of us

[@mustafaimad3109]

Dears i want courses for instrument system controller

[@realpars]

Thanks for your suggestion, Mustafa! I will happily pass this on.

[@mustafaimad3109]

@@realpars Iam waiting dear