Infrared Tachometer vs. Laser Non-Contact Tachometer vs. Stroboscope - Differences

N

neoth

#1
Hi all,

What is the difference between a Infrared & laser Non-contact Tachometer?

Which give a more stable and accurate reading?

What is the difference between a Tachometer and a Stroboscopes?

Regards
 
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charanjit singh

Involved In Discussions
#2
Re: Infrared Tachometer vs. Laser Non-Contact Tachometer vs. Stroboscope - Difference

I think you are already aware that a tachometer measures the speed of a rotating object, for example shaft of a motor or a fan. All the three instruments you have mentioned viz. Infra red Tachomter, Laser Non-contact tachometer and stroboscope are used for measuring speed of rotation. Non-conact tachometer means that this instrument is used without making a contact with the rotating body. In that sense all the three are non-contact tachomters.

The difference between these is the principle of operation of each one of them, i.e. using IR radiation, laser beam or, in the case of stroboscope a periodically 'fluctuating' light beam. The beam is focused on the rotating object and frequency of the 'fluctuation' or 'oscillation' is varied till it corresponds to the speed of rotation of the object when the object appears to be stationary (like 2 vehicles moving exactly at the same speed in the same direction alongside each other). Frequency of 'oscillation', 'fluctuation' or 'switching on/off' gives the speed of rotation of the object.

I hope this answers your query.
 
G

George Weiss

#3
Re: Infrared Tachometer vs. Laser Non-Contact Tachometer vs. Stroboscope - Difference

Greetings,
.....I am responding to the thought or point of view of best manufacturer specification accuracy being a priority in a product/device choice. The answer is not which is better, but which has the most accurate clock. The different models have different inputs to a clock controlled counting system. The clock is generally expected to be more accurate than the least significant digit of the display. A crystal clock can be expected to be more accurate than +/-100ppm or a perfect reading of 10,000RPM, (with 10,000RPM applied). For this reason, my answer is: pick the device with the best ppm or % accuracy specification.
my :2cents:
 
N

neoth

#4
Re: Infrared Tachometer vs. Laser Non-Contact Tachometer vs. Stroboscope - Difference

Hi all,

thanks for the reply,

actually i am using it to measure the rpm of a centrifudge.

the top cover of the unit have a small round clear window for me to shine my tachometer to measure the speed of the rotor.

so which device is more applicable for my usage?

regards
 
G

George Weiss

#5
Re: Infrared Tachometer vs. Laser Non-Contact Tachometer vs. Stroboscope - Difference

A strobe-a-scope is adjusted to match the speed of the rotation. This has it's own errors, as is obvious. It is more difficult in time and effort to get a reading, and the last choice. The optical, non-contact tachometer detects differences in light/dark, to develop a counting of pulses. The other laser, and IR would trigger on the variations also. I would avoid the strobe-a-scope, and pick the one which meets your accuracy needs. In your case, unless you have special requirements, all other options sound OK. They are all point an read. Your application might not allow the optical tach to work. This device works well with bright flashes of light and darkness. Pointing the optical tach to a room's floresent lighting gets a 7200 reading. This is 60hz * 2 * 60 for 7200RPH.
Closing question/comment: is this device being used in a medical environment? (spinning blood or other fluids).
Some devices have rear pannel monitoring points. Connection to a frequency counter is possible then.
 
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