Tag Archives: liquid

Figure 1 openQCM frequency behaviour caused by successive injections of water and sucrose at different weight percentage 7.5%, 15% and 30%. The measurement chamber is washed with pure water before each injection. The corresponding frequency shift is measured in static liquid at the equilibrium.

Sweet openQCM Tasting Water Sucrose Solutions

I’d like to share openQCM Quartz Crystal Microbalance frequency behaviour in contact with water solutions at different weight percent of sucrose. Continue reading

openQCM 1710 start up and air experimental condition quartz crystal microbalance frequency and temperature stability

openQCM frequency stability of quartz crystal microbalance in typical experimental conditions

We are now testing the performances of two different openQCM devices in the most typical experimental conditions in order to measure the frequency stability of the open source quartz crystal microbalance. Continue reading

Quartz Crystal Microbalance openQCM: our first test

As already mentioned, we have just completed the design and the electronic optimization of the Quartz Crystal Microbalance openQCM. At the moment we already have 2 working devices. So, we are very glad to show the first test in liquid environment.

In order to demonstrate the real behavior of the system  we have preferred to make a video. In my opinion is the best way to highlight the openQCM performances. Furthermore, it is a good opportunity to view the Java software in action!

openQCM is a system designed for working both  in air in liquid environments, the latter being the most challenging in terms of frequency noise and oscillator circuit design. The main aim of the experimental test are measuring:

  1. The frequency signal stability in air and liquid environments;
  2. The typical system equilibrium time after the liquid injection.

We chose to report raw data without any kind of data processing. This is very important for the evaluation of the performances of a sensing device, that’s the best way to appreciate the quality of opeQCM. In the final version of the  software we will use an algorithm for signal processing, in order to drastically increase the S/N ratio. But as you will see, the “raw” results are very exiting !

In this test we use a AT-cut quartz crystal at 10 MHz, pure water and a CellTram Oil microinjector.  The first part of the test was in air and after few minutes we injected water in the chamber. After the injection we collected more than 1/2 hour in order to evaluate the long time behaviour of the quartz sensor in liquid.

The first exciting results is that after the water injection, the system reached the thermal equilibrium in only few minutes. The second great results is the perfect horizontal plateau which remains at the same stable level for the rest of the experimental test.

If you want to evaluate by youself the quality of raw data you can download the data file here.