Digital thermometer
In the clinical treatment of patients, the standard means of taking a patient's temperature has been through the use of a mercury-glass thermometer. t consists of a hollow glass rod with a bulb of mercury at one end and a temperature scale along the glass rod. This type of thermometer typically requires approximately three minutes to achieve a stable reading. In the past decades, electronic temperature measuring instruments have begun to make inroads into the formerly exclusive domain of the mercury-glass thermometer. Digital thermometers provide the potential advantages of greater accuracy, greater ease and efficiency in reading, and faster time response, as compared to a minimum of three minutes for a mercury-glass thermometer. Digital thermometers have been introduced which emulate the linear structure of the basic mercury thermometer. A numerical display is usually disposed on electronic thermometers to assist in reading the measured temperature. Recently, infrared thermometers have been developed which attain an even faster stable temperature reading as compared to traditional digital thermometers. Infrared (IR) thermometers are devices which measure temperature without having physical contact with the object being measured. Infrared thermometers avoid the necessity of contacting the location at which temperature is actually being measured, and have also been designed for use in measuring the patient's temperature from the auditory canal or from the tympanic membrane. Infrared thermometers generally includes probes projected from the casing of the main body of the thermometer so as to be insertable into the external auditory canals of human beings. Waveguides are provided inside the probe to guide the infrared rays radiated from biological surface tissues, such as external auditory canals and tympanic membranes, to infrared sensors.
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