what is a transducer ?
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"A transducer is an electronic device that converts energy from one form to another. Common examples include microphones, loudspeakers, thermometers, position and pressure sensors, and antenna. Although not generally thought of as transducers, photocells, LEDs (light-emitting diodes), and even common light bulbs are transducers."
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Ultrasonic means too high-pitced for the human ear to hear.  A silent dog whistle is an example.  Sonar refers to using sound to produce an echo to locate something such as a submarine.  Bats combine ultrasonics and sonar to locate insects on the wing.  They eat the insects.
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Ultrasound is a sound that is outside the range of human hearing. An "Ultrasound" is a method of using these sounds to produce diagnostic images. It is commonly used for pregancies, but can also be used for many other purposes because it can produce images of tissue and does not expose the operator or patient to dangerous radiation. \n\nUltrasound can also be used to treat kidney stones. The link below explains ultrasound in detail.
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Are you looking for something like this?  It analyzes the mic input to your PC's sound card.  You can use it as a spectrum analyzer or oscilliscope.\n\nhttp://downloads-zdnet.com.com/Wavetools/3000-2169_2-10412688.html?tag=lst-0-6
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The phone has transducers that converts air vibrations in the voice to electric current variations (microphone)and one that converts electric current variations to air vibrations (speaker/headphone) by using the battery feed from the telephone system.After connecting the transducers by an electric conduction path or a wireless path (carrier modulation/demodulation)you can speak to and listen to the other end.
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Modulator Demodulator.\nWhich means that the signal is converted both to and from computer language (binary) and sounds.
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There are various brands but probably the most common in use in hospitals is AquaSonic (link to company website below.)\n\nThe gel facilitates the transmission of sound waves from the ultrasound probe to (and thence through) the skin. If there is air under the probe, the waves are reflected off it and you can't image the tissue underneath. Even a tiny air bubble will distort the wave/reading. The technical explanation (from Wikipedia):\n\n"Ultrasonography (sonography) uses a probe containing one or more acoustic transducers to send pulses of sound into a material. Whenever a sound wave encounters a material with a different acoustical impedance, part of the sound wave is reflected, which the probe detects as an echo. The time it takes for the echo to travel back to the probe is measured and used to calculate the depth of the tissue interface causing the echo. The greater the difference between acoustic impedances, the larger the echo is. The difference between gases and solids is so great that most of the acoustic energy is reflected, and so imaging of objects beyond that region is not possible."\n\nIt's a water-based gel (probably rather like KY). Most companies have proprietary formulae so I can't say exactly what they're made of. The second link is a rather neat discussion of different types of gel.
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They're essentially the same.  \n\nIf there is a small difference it is that the sensor is the device that converts a physical quantity to another (usually electric, like a microphone convert sound to voltage).  The transducer might be a device that contains a sensor and further converts the electricity to a more useful and interpretable value (e.g. a microphone might produce a tiny voltage and there may be an amplifier to make it a larger signal, making it less sensitive to noise and so forth).\n\nANyway, I hear the two used interchangeably all the time.
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Metal Oxide Semiconductor Field Effect Transistor.  It's the basic component of most electronic circuits and all digital ones.  It's the breakthrough that made computers so cheap, small and popular.  A transistor, you know, acts as an electrical "gate," acting on a smaller input voltage to allow a larger voltage to pass through.  So a transistor can act as an amplifier, by using a smaller current to control a larger current.  Used in a circuit called a "flip-flop," it makes up the basic circuit for computers and other digital electronics.\n\nThere are many kinds of transistors, dating all the way back to vacuum tubes; the reason MOSFETs are such a big deal is because they are made by "printing," in huge quantities and on extremely small scales, directly onto microchips.
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DSP, or Digital Signal Processing, as the term suggests, is the processing of signals by digital means. A signal in this context can mean a number of different things. Historically the origins of signal processing are in electrical engineering, and a signal here means an electrical signal carried by a wire or telephone line, or perhaps by a radio wave. More generally, however, a signal is a stream of information representing anything from stock prices to data from a remote-sensing satellite. The term "digital" comes from "digit", meaning a number (you count with your fingers - your digits), so "digital" literally means numerical; the French word for digital is numerique. A digital signal consists of a stream of numbers, usually (but not necessarily) in binary form. The processing of a digital signal is done by performing numerical calculations.\n\nFor a great tutorial on DSP, check here:\n\nhttp://www.dsptutor.freeuk.com/\n\nand here\n\nhttp://www.bearcave.com/misl/misl_tech/signal/\n\nFor additional info and explanations, check the sources
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An echo sounder consists of a transmitter, which emits an ultrasonic pulse, and a receiver, which detects the pulse after reflection from the seabed. The time between transmission and receipt of the reflected signal is a measure of the depth of water. Fishing boats use echo sounders to detect shoals of fish and navies use them to find enemy submarines.
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An attenuater reduces the amout of volume through a medium such as wire or pipe. by a specific amount of decibles per foot. A volume control is an attenuator. There is also a power ratio. for every 3 db in reduction the power is reduced by half.
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a thermistor is a resistor whose resistance changes with temperature. Because of the known dependence of resistance on temperature, the resistor can be used as a temperature sensor.\n\nSo, add a thermistor into a simple circuit with a power supply and a meter to measure current and you have the essence of a device to measure temperature.\n\nGet a bucket, fill it with ice and leave it till the ice has half melted. The temperatue of the water will be 0 degrees C. Pop in the thermistor (suitably electrically insulated) and measure the current.\n\nBoil a pan of water on the stove. As it's bubbling the water will be exactly 100 Degrees C, and again measure the current.\n\nUsing both values you can calibrate your new electronic thermometer!
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If pizometer is the correct spelling, I am not sure what it is.\n\nA piezometer is an instrament used to measure pressure.
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Probably ultrasonic....
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a signal to a device that makes a noise
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what is the indicater?