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Sunday, 2 December 2012

Data Logging: Thermoregulation of human body due to extreme condition


What Is Data Logging
In general, data logging means of all data generated by a device such as a lab instrument, or the data passing through a particular point in a networked computer system. Data logging is a common measurement application. In its most basic form, data logging is the measuring and recording of physical or electrical parameters over a period of time. The data can be temperature, strain, displacement, flow, pressure, voltage, current, resistance, power, and many other parameters.
A wide range of products can be categorized as data loggers, from basic devices that perform a single measurement to more complex devices that offer analysis functions and integrated displays. In addition, data logging is used in a broad spectrum of applications. Chemists record data such as temperature, pH, and pressure when performing experiments in a lab. Design engineers log performance parameters such as vibration, temperature, and battery level to evaluate product designs. Civil engineers record strain and load on bridges over time to evaluate safety. Geologists use data logging to determine mineral formations when drilling for oil. Breweries log the conditions of their storage and brewing facilities to maintain quality. The list of applications for data logging goes on and on, but all of these applications have similar common requirements. One question that we should answer is ‘How this data logging works?’. 

How data logging works?
Data logger works with sensors to convert physical phenomena and stimuli into electronic signals such as voltage or current. These electronic signals are then converted or digitized into binary data. The binary data is then easily analyzed by software and stored on a PC hard drive or on other storage media such as memory cards and CDs.
There are a few components that every data logger must have included:

·         Hardware to digitize what you are logging, including sensors, signal conditioning, and analog-to-digital conversion hardware
·         Long-term data storage, typically onboard memory or a PC
·         Data-logging software for data acquisition, analysis, and presentation
Follow these steps when using a data logger:

·         1. Connect sensors like heat sensor, resistance temperature detectors (RTDs), and accelerometers to the  data logger
·         2. Use your data-logging software to configure your data logger
·         3. Configure parameters like sample rate, alarms, and start or stop conditions for your data-logging task with    your data-logging software
·        4.  Run the data-logging task

·         After your hardware digitizes the sensor measurements, analyze and store your data for future use
The ability to take sensor measurements and store the data for future use is a important characteristic of a data logger. However, a data-logging application rarely requires only data acquisition and storage. Inevitably, you need the ability to analyze and present the data to determine results and make decisions based on the logged data. A complete data-logging application typically requires the elements illustrated below.





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