Temperature measurement an overview sciencedirect topics. There are four basic types of temperature measuring devices, each of which uses a different principle. For a correct recording of the core body temperature, the sensor would have to be tightly pressed into the axilla for 3040 min, which is the time it takes the body core to extend into the axilla figure 5. A measuring system for thermocouples ktype thermocouple chromelalumel in the standard thermocouple measurement configuration. The current used to measure will create an undesired heating up of the sensor. In this experiment you will have an opportunity to understand the concepts and uses of many of the. The predictable resistancetemperature relationship leads to an accurate temperature measurement device. This temperature distribution generates wind current along with cloud and rainfall phenomena. Allow your water bath to cool before attempting to dispose of the water in the sink. Concrete and asphalt increase mass density and heatstorage capacity. A comparison of different measurement technologies agilent technologies, inc.
Experiment instructions wl 202 fundamentals of temperature measurement 112010 wl. Experiments were performed to verify the temperature measurement technique. The measured voltage can be used to calculate temperature, provided that temperature is known. Temperature measurements regardless of the configurations shown above, the main application of thermocouples is to measure the temperature t at point 3. Temperature measurement of the pzt ceramics ring 2. Although these sensors have overlapping temperature ranges, each has certain applicationdependent advantages. If the measurement falls in between the lines as in the case of measurement c the value written must have one estimated digit. Principles and methods of temperature measurement course content temperature can be measured via a diverse array of sensors. Calibration of strain gauge for temperature measurement. If the measurement falls directly on the line the last digit would be 0. This paper is a lab report for the temperature experiments performed at the ltt lehrstuhl fur technische thermodynamik performed at the rwth aachen university lab in germany as part of a thermodynamics lab course. Microcontroller based temperature and humidity measurement system experiment findings pdf available september 2017 with 24 reads how we measure reads. Thermal conductivity is a measure of the ability of a substance to conduct heat, determined by the rate of heat flow normally through an area in the substance divided by the area and by minus. Thermocouples tbc 1142007, revised 3162007, 322,2007, 3162008 objective.
All of them infer temperature by sensing some change in a physical characteristic. When heated, one side will expand more than the other, and the resulting bending is translated into a temperature reading by mechanical linkage to a pointer. Calibration of hot wire anemometer for temperature measurement. Fundamentals of temperature and pressure measurements. Todays dial type come in a wide range of sizes, temperature ranges and accuracies. This form of tc measurement also allows tc to be measured continuously in the field and has gained wider acceptance in the last decade. Thus, atmospheric temperature is one of the most important meteorological elements as well as wind and precipitation.
Many different temperaturemeasuring devices have been devised and are in common use today. Tips for efficient pcb temperature measurement apply the following tips to ensure that the temperature sensor tracks and accurately measures the pcb temperature and subsequently, the main heat source, as shown in figure 6. Temperature measurement is a vital part of most industrial operations and is typically accomplished by a temperature sensora thermocouple or a resistance temperature detector rtdin contact with a solid surface or immersed in a fluid. As we had mentioned earlier, the data vstd t is often available for many commercially available thermocouples. If configuration in figure a1 is used, we need to just read off the. Temperature is a very critical and widely measured variable for most mechanical engineers. We will use a computerized temperature probe from vernier, which collects temperature and time automatically. It is a surprisingly difficult parameter to measure with the precision that one might reasonably expect. As phoenix has grown, the natural environment has been transformed from the native desert vegetation into a diverse assemblage of built materials, from buildings, to parking lots, to roadways. Fullfield temperature measurement in high strain rate. The author describes the wide range of techniques and specific devices available for temperature measurement and provides guidance for the selection of a particular method for a given application.
In industry the usual objective is to find a way to measure. A thermocouple can be used for temperature measurement after calibration, i. Experiment 1 chemistry 110 laboratory safety measurements. Wmo recommends to measure atmospheric temperature at the height from 1. If you understand these properties well, you can reliably predict the temperature at a measured resistance. To implement a thermocouple circuit, including thermistorbased coldjunction compensation, for temperature sensing. Measurement of temperature dependence in the piezoelectric. The temperature measurement and calibration apparatus td400 fits on a desk or bench top. Mechanical temperature measuring devices principle of operation a change in temperature causes some kind of mechanical motion, typically due to the fact that most materials expand with a rise in temperature. Use a common gnd plane between the temperature sensor and heat source. Human thermoregulation and measurement of body temperature in.
Archived from the original pdf on 20181116 we explore the more common temperature monitoring techniques and introduce procedures for improving their accuracy. A small pocket thermometer for testing air conditioning systems or cooking has a dial about an inch in diameter and a temperature range of 0 to 220 degrees f. Temperature is a very critical and widely measured variable for. The key to an rtds ability to measure temperature is the thermal properties of the metal winding. Using the collected data, you will determine the time constant of the heat transfer dynamics that model the temperature drop. Thermocouple and rtds introduction to temperature measurement.
You will be measuring the internal temperature of a grape or similar object as a function of time as it is plunged into a glass of ice water. Practical temperature measurement introduces the concepts of temperature and its measurement to engineers, physicists and chemists of all disciplines. Request pdf fullfield temperature measurement in high strain rate tensile experiment a new experimental setup, in which fullfield deformation and fullfield temperature are measured. Here, in this experiment we are going to use change in the area of overlapping for finding the. The builtin precision reference sensor works as an accurate temperature reference. Bimetallic temperature measurement devices bimetallic devices take advantage of the difference in rate of thermal expansion between different metals. For the most part, this experiment will be carried out as outlined in the lab manual, with the exception of the equipment used to collect the data. Pdf microcontroller based temperature and humidity. It includes eight different temperature measurement devices and shows their characteristics and how to calibrate them against a standard.
Temperature experiment surface vs air temperature background. Study and calibration of photo and magnetic speed pickups for the measurement of speed 44 45 10 study and calibration of a rotameter for flow measurement. Gutech temperature measurement demonstrating different temperature measurement techniques mohammed omer 000110050 152014 in this experiment. Calibration of thermocouple for temperature measurement.
In many cases the accuracy of temperature measurement determines the total error of an experiment. Assemble the thermocouple calibration cell see figure 2. Gastrointestinal temperature measurement using the ingestible temperature sensor provides an acceptable level of accuracy as a surrogate measure of tc without causing discomfort to the user. Each device has its own strengths and weaknesses, and is. Stable, less sensitive, high temperature applications, more expensive type t copperconstantan. To meet this wide array of needs the process controls industry has developed a large number of sensors and devices to handle this demand. Using labview to measure temperature with a thermistor. This type of transducer is used for temperature measurement.
As a rule, by using axillary temperature measurement, one determines only the peripheral temperature and not the core body temperature. Allow the water to boil for 35 minutes to establish a consistent temperature. The instrument used in the present lab is set up such that the displayed temperature, i. Many processes must have either a monitored or controlled temperature. Shcherbakov geophysical observatory borok, yaroslavskaja oblast, 151742, russia s.
Temperature measurement penn state mechanical engineering. The statement is true only if the temperature is 25c. In this lab, you will also calibrate the davis temperature sensor for your weather station. Thermometry is the science and practice of temperature measurement. In the laboratory, mass measurement will be used and the verb weigh will only be used to instruct you to determine the mass of an object.
Each device has its own strengths and weaknesses, and is generally designed for a fairly specific application. The temperature of the mercury in glass thermometer will be taken as a reference and the rest of instruments will be calibrated with respect to it. Objectives to make basic distance, mass, density, and time measurements to make calculations of volume and density, using proper units to practice graphing the relationship between the circumference of a circle and its diameter using spreadsheet software estimated time to perform this experiment. Mechanical thermometers can be constructed which use liquids, solids, or even gases as the temperaturesensitive material. Fabian geological survey of norway, leiv eirikssons vei 39, postboks 6315 sluppen, 7491 trondheim, norway karl. If your results are not within 2 of the expected temperature of 96 consult your laboratory instructor. In this experiment, it is required to measure the temperature of water bath and furnace by various instruments. Temperature measurement theory and practical techniques. Mcenroe department of geology and mineral engineering, ntnu trondheim, 7491 trondheim.
Introduction to temperature measurement temperature is the most commonly measured parameter, yet in many respects it is the least understood. Temperature measurement lab pennsylvania state university. These are generally marked off in two degree increments. Experiment 1 measurement of thermal conductivity of a metal brass bar introduction. There is a zero and gain adjustment pot provided for the calibration purpose. Thus, atmospheric temperature is one of the most important meteorological elements as well as wind and.
802 737 416 1153 354 117 118 1122 567 1022 489 1550 1232 1415 866 939 746 272 1206 1018 1158 1319 783 1445 104 630 1033 388 281 49 1150