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
Updated schematics, now ver 0.3
After some testing period we got new version of the schema ready. We are now at version 0.3. What is new? Well at least following has changed since ver 0.2: Error in UART wiring fixed.PicKit compatible programming connector added.Testing connector added.Voltage reference for Vref- input added.Voltage divider and by-pass capacitor added to the video signal… Continue reading Updated schematics, now ver 0.3
Test Tube Holder
Few months ago I made a post about a liquid container I had built. It is a one liter steel can with two windows. I can use it for measuring transmission spectra of all kind of liquids. However it didn't turn out as useful as I initially thought. Changing a sample liquid is too troublesome.… Continue reading Test Tube Holder
Liquid Container & Fiber input
I had a task to measure absorption spectrum through a container filled with liquid. No problem… except I didn't have a container. So I built this. A simple 1 liter container for measuring liquids. The container itself is a one liter paint can. Window ports are made of typical home pipe fittings, adapters and plugs.… Continue reading Liquid Container & Fiber input
Experimental Photonics 