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The High Temperature Speed Sensor – the Hottest New Technology

The High Temperature Speed Sensor – the Hottest New Technology

Author: Rosa Telipten

Have you ever stopped to wonder how gages and sensors in rocket engines work? Man, those engines and everything in them must get hot! So why doesn't the whole system go haywire when all of the finite mechanisms such as speed sensors that gage the rotation rate of all the different spinning motors get hot enough to melt common metals.

High Tech Materials

Well it would be easy to guess that they make everything out of high temperature alloys. Hey! What about electrical components that contain finite moving parts? Won't everything short out and what about metal expansion in high temperatures? The fact is, that all of these problems have been solved with the use of new high tech materials.

Magnetic Sensors

First of all, high temperature sensors use magnets or silicon strips impregnated with magnetic material to actually gage how fast something is spinning, so that eliminates any type of cable that would foul up in high temperatures. So, this eliminates one problem but what about thew others?

Ceramics Replaces Metal in High Temperatures

Ceramics are now used extensively in high tech, high temperature speed sensors and if fact ceramics are finding their way into many high temperature mechanical applications. Its hard, expands minimally, can be shaped and milled and doesn't conduct electricity and withstands extremely high temperatures, so ceramics works great in high temperatures.

High Tech Alloys Resist High Temperatures

For wiring, copper which melts at around 2,000 degrees is replaced by new high tech alloys that stand up to much higher temperatures. Instead of plastic coating, like regular wire, other high tech heat resistant materials such as asbestos are used to insulate the wiring in todays high temperature speed sensor.

About the Author:

Article on Rosa Telipten. Find the latest details on High Temperature Speed Sensor plus the best on Turbine Speed Sensor

Article Source: http://www.articlesbase.com/travel-tips-articles/the-high-temperature-speed-sensor-the-hottest-new-technology-598479.html

High Temperature Speed Sensor Device

Variable Reluctance Sensors - High Temperature
Motion Sensors (MSI) High Temperature sensors were designed to operate reliably in high temperature environments for long periods of time. These sensors can easily withstand repeated thermocycling and feature an operating temperature range of -450°F to +850°F and +1000°F intermittently. A flexible stainless steel braided sheath that can withstand exposure to +1000°F protects signal lead wires. Special materials and construction prevent damage from physical abuse and thermal shock. In addition, all High Temperature magnetic sensors are hermetically sealed.

http://motionsensors.com/vr-hightemp.html

Contact And Non-Contact Varieties Of Temperature Sensors

Contact And Non-Contact Varieties Of Temperature Sensors

Author: Thomas Pretty

Generally temperature sensors fall into two distinct categories, defined as contact and non-contact. It must be remembered that sensors and particularly those that measure temperature inherently have problems with accuracy. What is important to recognise is that the discrepancy estimates should be accurate and many readings should be made in order for the final results to have decent levels of accuracy.

Part of this is to calibrate your temperature sensors whether they are contact or non-contact with a known temperature, by doing this you can minimise any discrepancies in the readings, making your measurement extremely accurate; this process is fundamentally important before any measurement can take place.

Contact temperature sensors essentially measure their own temperature at any given time. They do this by creating a thermal equilibrium between the sensor and the substance being measured. Thermal equilibrium simply means that the two bodies have no heat flowing between them and are hence the same temperature. There are however a variety of errors that can occur when using these types of sensors, for instance surfaces are especially hard to measure with contact sensors, in such instances a non-contact method is more avoidable.

Contact sensors are by far the norm for temperature measurement in science and industry. Types of contact sensor include thermocouples and thermometers. Thermocouples use an electrical current with specific resistance levels that through variations of this resistance can measure temperature; this is widely termed the Seebeck effect. Out of the temperature sensors utilised in science and industry thermocouples are some of the most widely used due to their ease of operation, relative inexpensiveness and their ability to measure across a wide spectrum.

Thermometers as a means of measuring temperature differ greatly, not only in terms of accuracy but in terms of operation. Of course there is the most widely used sensor in the world the liquid glass thermometer; the one that measured your fever when you were a child. As well as these however there are filled system thermometers used in ovens to regulate cooking temperatures as well as bimetallic thermometers that have two metals contained within them that measure at different rates. However there is no need to use an expensive thermometer, it is even possible to measure temperature with the use of materials that change state at certain temperatures, scientifically these are known as phase change devices.

Less widespread is the use of non-contact sensors, as a result the manufacture and use of these devices is less standardised than the contact type. The situation is changing however; in the medical profession the use of the infra red ear thermometer is becoming extensive as a more efficient and effective way of gaining patient temperatures. The lack of standardisation of other forms of non-contact sensors has meant that they are struggling to be utilised across a wide variety of industry sectors.

Fundamentally they work on the principles of Plank's law; that is the thermal emission of radiation, although the names given to this type of sensors are extremely varied, adding to the confusion that surrounds their usage. Names such as pyrometer, radiometer and thermal imager are most common but are in no way a comprehensive list for this type of temperature sensor.

Today temperature sensors are used in all manner of industries and professions. Naturally the medical profession uses both varieties of sensor extensively but those in the manufacturing of foodstuffs such as the fermenting process as well as the manufacture of goods also use thermal measurement regularly. The large number of different varieties stands testament to the importance of this piece of equipment in the world currently, fundamental is that they should be calibrated so that accurate measurements can be made.

About the Author:

Equipment expert Thomas Pretty looks into the different types of temperature sensors and the industries that use them.

Article Source: http://www.articlesbase.com/technology-articles/contact-and-noncontact-varieties-of-temperature-sensors-453850.html

Different Types Of Temperature Sensors Available

Different Types Of Temperature Sensors Available

Author: Thomas Pretty

There are many industries that utilise temperature sensors in day to day operations. Mostly there are two distinct varieties of contact sensor used for the purpose; these are the thermocouple and resistance temperature detector or RTD. Measurement usually takes place in liquids or with contact with the target surface. Contact is not however a prerequisite, there are some temperature sensors out there that operate without contact with the target material; instead measuring the ionisation of the air caused by heat.

When selecting which type of sensor to use there a myriad of considerations that must be made depending specifically on the application. Additionally however when selecting a sensor it is important to consider the temperature range, the required accuracy and response time as these will vary with different measuring methods. When accuracy is of prime importance an RTD sensor is preferable although for those with an eye on finances, thermocouples are clearly the cheaper, more affordable option. Hopefully the following break down of the RTD, thermocouple and infrared thermometer will help operatives make the decision.

The basics of RTD operation rely on the increase of resistivity that occurs when the temperature of a material is increased. Normally RTD sensors are manufactured from metals such as platinum, nickel and copper. Predominantly copper and nickel variants are used for measuring lower temperatures while platinum, although more expensive has a wide temperature range that is useful for a variety of purposes. Normally RTDs are constructed simply, a sensing element is connected a non-conducting element made from ceramic, glass or mica. The element measures the resistance and from this reading a temperature result is gained.

Thermocouples differ from RTDs in that they utilise two different metals that are joined at one end to produce a voltage that can be converted into a temperature reading. Where the two metals meet is called the sensing junction, this junction can be connected to extension wires meaning that the physical range of the thermocouple is large. Any two metals can be used in the construction of thermocouples making them more affordable than RTD sensors. Thermocouples however can produce inaccurate results if other components are introduced into the electrical circuit as they rely upon voltage to measure temperature.

As previously stated there are other forms of sensor on the market although the two aforementioned are predominant. Increasingly infrared thermometers are being used for temperature measurement. These work through a non contact method and are subsequently used for specific applications that require remote temperature measurement. Usually they consist of a lens to focus the infrared light on a source and then using the light to take a temperature reading. As they do not need contact to measure they are frequently used as a control thermometer when calibrating thermostats and inbuilt thermometers. As well as this the infrared technology is often used in researching the heating and cooling properties of certain materials.

Hopefully this information has given the uneducated a clearer idea of the types of temperature sensor out there on the market today. Depending upon which applications they are to be used for, all three have various benefits and restrictions. Cost naturally varies but in most cases the extra cost is a necessary sacrifice to achieve greater levels of accuracy. Whether using RTDs, thermocouples or infrared spot thermometers all can produce valid and accurate results; once you have decided which will suit your needs most effectively take time to research the models out there to find the perfect solution to your temperature measurement requirements.

About the Author:

Technology expert Thomas Pretty looks into the different forms of temperature sensors available on the market today.

Article Source: http://www.articlesbase.com/technology-articles/different-types-of-temperature-sensors-available-523315.html

RTD
A basic physical property of a metal is that its electrical resistivity changes with temperature. All RTD's are based on this principle. The heart of the RTD is the resistance element. Several varieties of semi-supported wire-wound fully supported bifilar wound glass, and thin film type elements are shown here.
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THERMOELECTRICITY IN RETROSPECT
The principles and theory associated with thermoelectric
effects were not established by any one person at any
one time. The discovery of the thermoelectric behavior of
certain materials is generally attributed to T. J. Seebeck.
In 1821, Seebeck discovered that in a closed circuit made up
of wire of two dissimilar metals, electric current will flow if
the temperature of one junction is elevated above that of the
other. Seebeck's original discovery used a thermocouple circuit
made up of antimony and copper. Based on most common
usage and recognition today
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