Advice with Acoustic Emission

[kbllau]

Hi
I am totaly new in this area and my project is about Web-based condition monitoring of turning cutting tool through the analysis of the acoustic emission signal generated. I have integrated the sensor with Labview card. My concern is about the output RMS of the sensor it is very very low. it is a brand new sensor from Kistler and the out put should be +/- 2 volt. This is a sample of the sensor output RMS
0.017206
0.017198
0.017168
0.017134
0.017131
0.017127
0.017088
0.017085
0.017081
0.017073
0.017041
0.017009
0.017002
0.016988
0.016976
0.016875
0.016848
0.016818
Are these normal results or there is some thing wrong. in the sensor setup. Thanks all

 

[SomptingGuy]

It's more likely to be something wrong between the sensor and your ADC. Does the sensor need a charge amplifier? If so, is that set upsensibly?

 

[kbllau]

Yes This is a llist of the equipment i used:
AE type 8152B111

Coupler type 5108A

Interface board
Type CB-68LP

filters

 

[Strong]

I think you should check the sensor specifications, since the Bias voltage is 2.2 VDC and not the signal output. You may need a preamplifier ahead of your A/D board. What is the sample rate? You may need to sampe at 500k samples/sec or higher to measure AE frequencies well over 50-kHz. How do you expect anyone to interpret the list of numbers without more information?

Walt

 

[kbllau]

Hi Thanks Strong: ( All links needed copy and paste please)
This is the link for the AE specification:

http://www.kistler.co.uk/mediaacces...=do.productfinder.gb.en-gb?param=App.8152B111

its type is 8152B111 The third coulmn at the page no 2.

My connection was like this:

AE B8152B111 connected to a Kistler Coupler ( this is the link for the coupler

http://www.kistler.co.uk/do.productfinder.gb.en-gb?param=App.5108A

)

Then connected to the Labview card type 6014.
and i use The Labview software to filtering the signal and analysis the results.

 

[Strong]

Looking back at your list of numbers, they look like the noise floor of your measurement. The NI A/D converter has +/- 50 mv minimum full scale with 200,000 samples/sec sample rate and only 12-bit resolution. The Coupler has a gain of 1.0, so no amplification of signal is provided. The signal you are trying to measure could range from micro-volts to millivolts, but a few volts os unlikely unless the cutting tool is cutting into the sensor. My recommendation is to lower the input voltage setting on A/D converter and/or add an amplifier to raise signal level.

Walt

 

[mahardika]

Dear kbllau. Now, I am facing the same problem. I could not get the signals from my new brand AE sensor from Kistler too. I think "strong" is right, that your signals mentioned is a noise. Have you solved your problem yet...? Now, I am using AE sensor type 8152B211. If you have solved your problem, would you mind to teel me how..? Thank you. Regards, Mahardika...