In our earlier post about driving the LED sources we wrote something like "creating triangular wave is straight forward". But it was not. We struggled to create reasonable triangle wave source using a single side (+5V) op-amp circuit. The shape of the wave was ok but we just could not make it stable and found… Continue reading Turbidimeter – Driving LEDs Part 2
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Turbidimeter – the sensor amplifier
Our turbidimeter is so called "modulated four-beam" type. That means there are two separate light sensors. For more details see our previous post. What we need next is an amplifier for these light sensors. And here is the schematics for it. turbiditymeter-sensor-amp-ver-0.2Download I quickly point out some details: Two photodiodes have been connected to dedicated… Continue reading Turbidimeter – the sensor amplifier
Turbidimeter – Driving LEDs
How to pulse LEDs.
Turbidimeter – the basic arrangement
The basic arrangement of the turbidimeter is here. The important photonics parts have been selected to begin with. Electronics and possible software will follow later. So far we have not decided if this will be a stand-alone (with own display) or a pc-controlled (no display) device. The optical arrangement of our turbidimeter is so called… Continue reading Turbidimeter – the basic arrangement
TURBIDIMETER project launch
We are delighted to tell about our new project, an open source turbidimeter for water quality measurements. Open source: we will share all our design data for anyone to be used in their own projects. Turbidimeter: instrument that measures scattering of light to quantify the amount of small particles in liquid. In some versions also… Continue reading TURBIDIMETER project launch
Experimental Photonics 