However, Y-27632 mw DSPs and microprocessors have a fixed sequential construction for computation, which can easily be overloaded when the processing time between samples is significantly reduced, as in high-speed control, while FPGAs have a natural parallel architecture for high-speed computation. Along with the advantages previously cited, FPGA development is performed under Hardware Description Language (HDL), making the design portable and platform independent, which is not the case for commercially available DSPs or microprocessors.In this paper, the development of a low-cost automatic carbon dioxide-methane gas sensor based on the principle of the solubility of gaseous species in water is reported. The novelty of this work is two-fold.
First, a physical principle, never used before, is applied for binary mixture quantification, drastically reducing the cost and complexity of the equipment and facilitating on-line monitoring. Second, the hardware implemented in the FPGA has the capacity for data acquisition, data distribution, data processing, data communication and control, adding functionality and autonomy to the automatic carbon dioxide-methane gas sensor and allowing it to be deployed in the field.2.?Experimental SectionThe design of the hardware developed is divided into several components: an RS-232 Interface, an Activation State Timer, the Control, proportional integral derivative (PID) Temperature Control, Data Processing, Sampling Time Base, Data Acquisition and Distribution and Polynomial Linearization.
A general block diagram of the complete digital system for the automatic carbon dioxide-methane gas sensor is shown in Figure 1.Figure 1.Block diagram of the carbon dioxide-methane gas sensor with the digital system.2.1. Description of the Gas SensorTo quantitatively determine Drug_discovery the binary gas mixture, the carbon dioxide-methane gas sensor has to perform a three-stage cycle: sampling, adsorption and regeneration. In the sampling stage, the device takes in a predefined volume of gas in the measuring cell and calculates the number of moles of the binary gas mixture inside the measurement cell. In the next stage (absorption), the gas sensor removes the CO2 from the gaseous sample by movement-enhanced contact with a fixed quantity of absorption liquid. At the end of the absorption stage, the digital system calculates the remaining number of moles and displays the methane content percentage in the sample. In the third and last stage (regeneration), Sunitinib clinical the gas sensor regenerates the CO2
The definition of ��Intelligent Space�� (IS) was formerly proposed for an environmental system capable of offering humans informative and physical support.