However, the cross-sensitivity of the device to different indicators has not been addressed in this work.It is important to highlight that such color changes are fully reversible, which allows real time monitoring of ammonia concentrations. Color change information is transferred through the MMF via interaction of the evanescent film with the universal pH indicator. The advantage of the universal pH indicator is that it not only exhibits a wide spectral response, but also that the absorption changes in the spectrum have opposite responses. This means that the absorption spectra exhibit a peak and a valley that increase and decrease respectively as a function of the ammonia concentration. Two key advantages can be obtained from this characteristic response.

Firstly, we can perform ratiometric measurements (difference between peak and valley absorbance values) that significantly enhance the sensor response to ammonia. Secondly, and more important, the ratiometric measurements allow us to neglect external disturbances such as temperature and humidity. It is well known that pH indicators are sensitive to temperature and humidity, which also occurs in the case of the universal pH indicator. However, when exposed to temperature and humidity changes, both the peak and the valley experience similar changes in absorption, both increase o
Measuring human movements is important before rehabilitation, training or exercises can start. Motion capture systems that use cameras, accelerometers, and flexible electrogoniometers have been studied extensively [1�C5].

Although motion capture systems are capable of accurate measurements, they are inconvenient Batimastat to use. Either the measurements must be set based on the characteristics of the person, or the axis of the coordination system has to be reset [2]. Moreover, the construction of the system requires fairly substantial and heavy equipment. The main drawbacks of the motion capture systems available in today’s market are their weight and rigidity. In particular, conventional sensors often require the use of complex and uncomfortable mechanical plug-ins in order to position the sensors on garments [6].Textile solutions are well suited for constructing a sensing system that is comfortable for the wearer. Several studies have been carried out to show that a textile sensor is a practical and wearable electric device [6�C9]. Electronic textiles (e-textiles) are used in the entertainment industry and the fashion industry, as well as for communication, sensing and monitoring, even for position location [10�C15].