Science Information

Transducers - The Remarkable Changers


Complex control systems all make use of signals that can be easily measured and altered remotely. Automatically operated machines or actuators need to be powered either by electrical motors, pneumatic or hydraulic cylinders.

The most common signals sent out from a transducer are electrical current or voltage and pneumatic pressure. These signals are easily translated by controllers. Visual measuring devices like liquid bulb thermometers are not able to be used in automatic control systems because there are no electrical or pneumatic signals.

However, when some other component is added to it to enable it to give a corresponding signal, then the measuring unit becomes a transducer.

A transducer is a device to convert a signal (representing a physical quantity) of one form into a corresponding signal of another form, retaining the amplitude variations of energy being converted.

Just as an example, a microphone is a sound transducer (acoustic to electrical) and a loudspeaker is an electrical transducer (electrical to acoustic). A transducer may be an integral part of the measuring unit, for example pressure to displacement in a Bourdon pressure gauge. It may also be a separate unit converter especially suitable to change the signal to a better form for remote transmission, e.g. displacement to electrical in a differential transformer.

How do these transducers work?

To convert physical movement to electrical signals, some devices make use of variable resistors. Any movement will cause a slider contact to change position against a resistance wire causing a change in electrical current or voltage. Other devices may make use of the movement to alter the position of an induction coil relative to the magnetic core, causing a change in the induced current in the circuit. Others may make use of the movement to change the air gap between two capacitance plates, causing a change in the current in the circuit.

In the case of the loudspeaker, the opposite effect takes place. Electrical signals are converted to movement.

Some pneumatic transducers make use of changing air signals to cause a corresponding mechanical movement in the flapper and linkages. This movement is then converted to electrical signals by the methods above. So it takes 3 steps of conversion before we can get the electrical signal.

Once the electrical signal is obtained, it can be used to compare to the set value in the controller, and a whole control system can be designed from it.

Well folks, get your signals and be in control!

"What You Should Know About Travelling Make Ease" The Smart Traveller prepares for Journeys into Unknown Territory. Foreign Travel requires More.

Many years of working experience in Marine, Facilities, Construction has given the author material for writing e-books and articles related to engineering, and management. Subscribe to facworld ezine

More information at Marine Engineer and M & E Engineer


MORE RESOURCES:
This RSS feed URL is deprecated, please update. New URLs can be found in the footers at https://news.google.com/news


Science Magazine

MIT to use $350 million gift to bolster computer sciences
Science Magazine
“Roughly 40% of our current undergraduates are majoring in computer science or computer science and X,” says MIT Provost Martin Schmidt. With only 10% of the university's 1000 faculty capable of teaching computer science courses, Schmidt says, “having ...
MIT reshapes itself to shape the futureMIT News

all 153 news articles »


Science Magazine

Why scientists had trouble predicting Hurricane Michael's rapid intensification
Science Magazine
Hurricane Michael roared into Mexico Beach, Florida, on 10 October as the strongest storm ever to strike the Florida Panhandle in terms of wind speed, and the third strongest to make landfall in the continental United States. The storm caused severe ...

and more »


The Guardian

Fact check: Donald Trump's claims versus climate science
The Guardian
Verdict: False The US government's own Climate Science Special Report, published under Trump, finds that “it is extremely likely that human activities, especially emissions of greenhouse gases, are the dominant cause of the observed warming since the ...
Trump may not know what's behind warming, but scientists doThe Republic
Trump: Climate change scientists have 'political agenda'BBC News

all 626 news articles »


Washington Post

Kellyanne Conway called Elizabeth Warren's DNA test 'junk science.' Is it?
Washington Post
Elizabeth Warren (D-Mass.) released DNA results showing that she had a distant Native American ancestor — something President Trump had dared her to do — White House counselor Kellyanne Conway dismissed the DNA test, calling it “junk science.”.
Conway responds to Warren DNA test: 'Junk science' that 'really doesn't interest me'The Hill
Kellyanne Conway Dismisses Warren DNA Test As 'Junk Science'The Daily Caller
Elizabeth Warren's family storyYouTube
Elizabeth Warren For Senate -The Boston Globe
all 1,496 news articles »


Popular Science

Five science tricks to scare up a better Halloween costume
Popular Science
Halloween is coming, which means the race for the most awesome costume is on. Fortunately, a little science can add some serious fright to your get-up. These tricks only require a little advance preparation, but your friends will remember the result ...



PBS NewsHour

Trump tours Michael's devastation, questions climate science
PBS NewsHour
President Trump toured a Gulf Coast ravaged by Hurricane Michael. The death toll stands at 17, dozens are still missing and thousands are expected to be without power for another week or longer. The president promised federal help in rebuilding.



Our View: Proposed lobster rules not based on science
Kennebec Journal & Morning Sentinel
A scientific paper that called for stricter regulations on Maine's lobster fishery to protect endangered right whales plainly illustrates a two-sided problem. We need policymakers who will rely on science, and they need science that they can rely on ...

and more »


Science News

Add beer to the list of foods threatened by climate change
Science News
Science News. Published online August 8, 2018. E. Engelhaupt. Rising CO2 levels might not be as good for plants as we thought. Science News. Vol. 193, May 12, 2018, p. 6. S. Milius. Changing climate could worsen foods' nutrition. Science News. Vol. 191 ...

and more »


Brentwood Home Page

Vanderbilt Science Policy Group wants to hear from candidates on matters of science
Brentwood Home Page
The Vanderbilt Science Policy Group (VSPG) has announced a “Bipartisan Science Policy Forum” set for Oct. 24 “to highlight the importance of science and its impact on society during the 2018 midterm elections.” So far, however, the forum isn't bipartisan.



The Atlantic

For Some Poor Countries, Climate Science Comes Too Late
The Atlantic
It's easy to talk about how climate change will alter Earth's surface in the century to come. It will raise sea levels, flood cities, and set off droughts. As this month's dire UN report shows, decades of climate science have made the worldwide dangers ...

and more »

Google News

home | site map | Xray Photography
© 2006