ChipTip Strobe - strobe tachometer for mechanic

ChipTip Strobe - strobe tachometer for mechanic

By Denis V. Komissarov

Strobe mild supply can be used to measure rotation speed of varied machinery elements (e.g. shafts, pulleys, spindles and so on.). When the frequency of strobe mild equals to the rotation frequency of the measured half human eye (actually brain) perceives the image of the rotating half as stationary (not rotating) - lets name this phenomenon as perceived cease. Please notice that perceived stop happens at any strobe frequency which is a multiple of precise rotation velocity. So for example pulley with 600 RPM will seem non rotating at 10Hz (600 RPM) strobe mild, 20Hz (1200 RPM), 30Hz(1800 RPM) and so on. Therefore you must rigorously improve strobe frequency to find the lowest Hz which gives perceived cease.

System necessities:

1. Android 6.0 or larger ( software won't work on earlier versions).

2. Phone with camera and integrated flashlight.

Maximum strobe frequency is determined by your cellphone. On my test phones I was in a place to get 40 Hz with good frequency stability ( -2%) and 60Hz with bigger errors. On your telephone it could presumably be worse or higher. The newer and extra powerful the phone is - the better might be strobe frequency and stability.

Usage:

1. Turn strobe ON by urgent the corresponding button.

2. Point flashing gentle in direction of rotating half which RPM you need to measure.

3. Move the slider slowly from left to right and watch for perceived rotation stop of the noticed part.

4. Then using increment and decrement buttons tune strobe frequency precisely to obtain good perceived stop of the rotation. Observed half should have a number of periodic components e.g. 3 jaws in a chuck or several bolts on a flange. Those periodic elements will produce noticed rotation stop effect.

RPM - exhibits the RPM worth corresponding to the present strobe frequency .

Hz - exhibits present strobe frequency. This is actually measured frequency of the strobe light (measured from the start of 1 flash to the beginning of subsequent flash) which incorporates all delays of code execution.

Error (%) - this is the measure of attainable error of strobe frequency. Actual frequency is somewhere between (Hz minus Error) and (Hz plus Error) with 68% chance (i.e. Error is one normal deviation of Hz). This is statistical measure as a outcome of each strobe cycle has random period because of the fact that Android isn't actual time working system.

Smooth readings - turns On and Off averaging of Hz and RPM. When turned On it allows to see more steady values with much less jitter.

Flash period - permits to manage time when flash is on in each strobe cycle. It is beneficial to make use of quickest settings. This will give more centered picture of perceived cease. On some telephones Fastest setting does not work - the flash doesn't turn on in every cycle or would not deliver enough brightness. In this case please use 2 ms or 5 ms settings.

You can talk about this software, propose new options and report bugs here: https://hot-chip.com/forum/index.php

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