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	Surface Acoustic Wave (SAW) Device Applications
		SAW correlators enable the passive reception and trans- mission of complex coded signals.
		SAW filters enable the passive reception and transmission of complex coded signals.
		It consists of two quartz SAW sensor arrays, a gallium arsenide (GaAs) multiplexing phase-detector chip, and passive matching components mounted together on a thick-film, hybrid alumina substrate.
	www.sandia.gov /mstc/products/usystemsprod/rfandoptosystems/saw.html (285 words)

	SAW Filters by COM DEV SAW Products
		A surface acoustic wave (SAW) is a type of mechanical wave motion which travels along the surface of a solid material.
		In these crystals the SAW motion is similar to that of the isotropic case described earlier, though with the difference that the wave now has an electric field associated with it.
		An example is 34° Y-X quartz, meaning that the SAW propagates in the crystal X-direction, on a plate with the surface normal rotated 34° from the Y-axis.
	www.saw-device.com /intro_to_saw_filters.html (1051 words)

	CAMEX-3 JPL Surface Acoustic Wave (SAW) Hygrometer
		The SAW hygrometer measures dewpoint by establishing equilibrium between evaporation and condensation on the surface of the SAW device.
		Using a SAW device as a fast, high-sensitivity moisture sensor, a feedback controller measures the condensation on the sensor surface, and responds by heating or cooling the sensor to maintain equilibrium.
		On the one hand, the presence of salt on the SAW surface may explain the tendency of the SAW hygrometer to measure dewpoint (as opposed to frostpoint).
	microwave.msfc.nasa.gov:5721 /dataset_documents/dc8jplsaw_dataset.html (2434 words)

	Sawtooth wave - Wikipedia, the free encyclopedia
		The sawtooth wave (or saw wave) is a kind of basic non-sinusoidal waveform.
		The latter type of sawtooth wave is called a 'reverse sawtooth wave' or 'inverse sawtooth wave'.
		The sawtooth wave is the form of the vertical and horizontal deflection signals used to generate a raster on CRT-based television or monitor.
	en.wikipedia.org /wiki/Sawtooth_wave (675 words)

	Acoustic Wave Technology Sensors - Sensors
		Shear horizontal wave motion signifies transverse displacements polarized parallel to the sensing surface; shear vertical motion indicates transverse displacements normal to the surface.
		Surface wave velocities are temperature dependent and are determined by the orientation and type of crystalline material used to fabricate the sensor.
		SAW velocities are strongly affected by stresses applied to the piezoelectric substrate on which the wave is propagating.
	www.sensorsmag.com /articles/1000/68/main.shtml (4438 words)

	Surface acoustic wave - Wikipedia, the free encyclopedia
		A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material having some elasticity, with an amplitude that typically decays exponentially with the depth of the substrate.
		SAW devices are employed as filters, oscillators and transformers based on the transduction of acoustic waves.
		SAW filters have enjoyed successful application in the booming cellular telephones market and provide significant advantages in performance, cost, and size over other filter technologies (digital signal processors, quartz crystals (bulk wave), LC filters, and waveguide filters).
	en.wikipedia.org /wiki/Surface_acoustic_wave (322 words)

	DarkSonus: Introduction to Subtractive Synthesis
		The "saw" wave oscillator creates a waveform that is characterized by a vertical leap from the highest point of the wave or lowest point (the other way around is common, but it doesn't make a difference in sound).
		If we were to take the fine tune knob of one of the saw waves and turn it up some, a very slight type of "noise" (dissonance to be technical about it), will start to come in, which leads to a more natural and organic sound.
		LFO waves are generally pretty similar to oscillator waves, but they are slower and therefore the harmonic content of an LFO doesn't matter at all, the waveform does.
	www.darksonus.com /DS_articles_intro_subtractive_synthesis.php (2874 words)

	AirGATE Technologies. SAW Harsh RFID Solutions. Project SAW (Surface Acoustic Wave). Benefits of SAW. SAW Applications.
		SAW technology is commonly used in the electronic circuitry of everyday appliances, such as mobile phones and televisions, where the waves are used to filter frequencies.
		SAW technology provides a way to solve problems facing companies that have been unsuccessful in deploying common RFID technology to identify, track, and catalog tagged items in harsh environments or where long read ranges are required.
		SAW devices are built on the surface of piezoelectric crystalline materials.В This allows the devices to work over very wide ranges of temperature and in the presence of radiation dosages that would render semiconductor devices useless.В This makes these devices ideal for applications where sterilization of the tagged item is required.
	www.airgatetech.com /AIRGATE/RFID-solutions/Project-SAW-Harsh-RFID.aspx (712 words)

	Surface-Acoustic Waves (Site not responding. Last check: )
		Wavevectors of the X waves lie on the surface of a cone, as for nondiffracting waves in general.
		The principle of the SAW imaging apparatus (a Michelson-type interferometer), its applications and theoretical estimations of its capabilities were presented in the XXX Annual Conference of the Finnish Physical Society in March.
		In the future the aim is to extend the measurement bandwidth beyond 1 GHz and to use the apparatus for surface-acoustic wave and bulk-acoustic wave device studies in cooperation with component manufacturers and foreign scientific collaborators.
	focus.hut.fi /annrep/1996/node32.html (2096 words)

	Will You See SAW? (Site not responding. Last check: )
		Surface Acoustic Wave (SAW) technology has been used for RFID since the late 70s but the tags (like all RFID tags of the time) were bulky and expensive.
		SAW tags use piezoelectric crystals with “reflectors” at pre-determined intervals to represent the tag’s data (which can be read by variations in amplitude, time, phase and/ or other variable).
		With the potential for increased range, SAW tags are often capable of being read on difficult materials such as liquids or metals because it is possible to trade some of the range performance of the system for operation in the vicinity of these materials.
	www.aimglobal.org /technologies/rfid/resources/articles/nov03/saw.htm (1566 words)

	Integrated SAWs using GaAs
		SAW devices consist of a piezoelectric substrate, typically quartz, and two interdigitated transducers formed by photolithographic patterning of a thin metal layer.
		The velocity and attenuation of the propagating wave are very sensitive to properties, such as mass and viscoelasticity, of thin films formed on the device surface.
		Quartz, the typical substrate for SAW sensors, is not a semiconductor while Si, the typical semiconductor used for microelectronics, is not piezoelectric and requires piezoelectric film deposition to enable SAW excitation.
	www.sandia.gov /mstc/technologies/microsensors/sawgaas.html (624 words)

	SAW devices are used in considerable range of applications in modern electronics
		SAW energy is concentrated near the surface in a small region of approximately one wavelength in depth, therefore Piezoelectric thickness must be at least two wavelength thick to ensure correct conditions for Rayleigh wave propagation.
		SAW devices are used in considerable range of applications in modern electronics.
		In SAW devices, the change of electrical conductivity and the mass change of the chemical interface cause the change of phase velocity.
	home.gwu.edu /~farid_h/SAW.htm (290 words)

	freesound :: view sample :: Basic saw wave 2 G#2.wav (Site not responding. Last check: )
		It is a basic saw waveform.There is a little low pass filtering on the sound, but the sound is still quite rich in harmonic content.
		Basic saw wave 2 C5.wav :: (0:02) :: This sample is part of the "Basic saw wave 2"...
		Basic saw wave 2 C1.wav :: (0:02) :: This sample is part of the "Basic saw wave 2"...
	freesound.iua.upf.edu /samplesViewSingle.php?id=8186 (435 words)

	Surface Acoustic Wave (SAW) sensors
		However, unlike filters for telecoms, some SAW torque sensor technology exploits the influence of strain, mechanical and thermal, on the resonant frequency of a single port SAW resonator – the first order effect being a reduction in resonant frequency with increase in surface strain and hence in the distance that the wave has to travel.
		SAW torque sensor technology exploits the principal tensile and compressive strains on the surface of a shaft in torsion for the measurement of torque.
		SAW devices operating at 433MHz are bonded to metallic packages in order to protect them from surface contamination.
	sensing.honeywell.com /index.cfm/ci_id/142333/la_id/1.htm (302 words)

	vco (Site not responding. Last check: )
		Otherwise a leaky integrator value of.999 is used for the saw and square waves and.995 is used for the triangle wave.
		This can be used to "flatten" the square wave or "straighten" the saw wave at low frequencies by setting ileak to.99999 or a similar value.
		which occurs during the first half cycle of the square wave which causes the waveform to be greater in magnitude than all others.
	www.kevindumpscore.com /docs/csound-manual/vco.html (429 words)

	PHYS & VISUAL ARTS NOTES on Lesson 2
		When the wave speed in the incident medium is slower than in the transmitting medium the reflection is "soft" and the reflected pulse comes back with the same phase, that is, with the pulse amplitude in the same direction.
		There is a traveling, oscillating electric field that is the light wave and this field is transverse to the direction the wave is propagating.
		The wavelength increased dramatically as the waves went from the slower moving section of the machine to the faster moving section.
	astro.physics.sc.edu /~rjones/phys153/lec02.html (816 words)

	IntraSAW - Lectures
		For calculation, the concept of a nodal admittance matrix of a SAW transducer is introduced, with the self- and mutual elemental nodal admittances of a periodic SAW transducer with the uniform aperture deduced in the closed-form.
		A complete mixed scattering matrix of a SAW system is deduced as the closed-form solution of the block-matrix equation to express all the currents on the electric ports and the reflected waves on the external acoustic ports in terms of the applied voltages and incident acoustic waves.
		As a particular case, the mixed scattering matrix of a SAW transducer is deduced in the quasi-static approximation where a short-circuit SAW transducer is supposed to be non-reflective.
	intrasaw.com /index.php?option=com_content&task=view&id=15&Itemid=39 (5454 words)

	RFID Journal - - RFID (Radio Frequency Identification) Technology News & Features
		As the acoustic wave travels along the crystal, it picks up a pattern produced by those reflectors, which is converted to a unique ID through the interrogator's digital signal processor.
		Thus, by analyzing the wave deformations, the interrogators can also determine a SAW tag's temperature and the shock or pressure to which it is being subjected.
		CTR's SAW tags operate in the 2.45 GHz band and, according to Sheriff, can be read from as far away as 300 feet.
	www.rfidjournal.com /article/articleview/2495/1/1 (892 words)

	[No title]
		When SAW devices were used for passive generation (in the transmitter) as well as pulse compression (in the receiver), the two devices (the ‘expander’ and ‘compressor’) were often made as a matched pair mounted in the same package, as this helped to reduce errors due to differences of fabrication or temperature.
		The earliest SAW example appears to be that of Alsup et al in 1973 [70], and it was subsequently developed by for example Atzeni et al [71], Jack et al [72] and Moule [73].
		This component, consisting of an array of unconnected electrodes parallel to the SAW wavefronts, was introduced in 1971 by Marshall and Paige [83, 84].
	www.ieee-uffc.org /freqcontrol/hist3.html (13986 words)

	Acoustic Wave Sensors Infiltrate the Auto Industry \| WDD Asia - Wireless Design & Development
		Because of this, the SAW is a very sensitive probe for measuring mechanical properties such as their sensitivity to mass loading and visco-elastic changes like stiffening (increase in the oscillation frequency) and softening (decrease in the oscillation frequency).
		The Rayleigh SAW is also sensitive to stress or strain coupled into the SAW substrate whether it be through the packaging or on a diaphragm on which the SAW transducer is fabricated.
		The wave is a waveguide mode with energy throughout the bulk of the crystal and is dependent on the thickness of the substrate.
	www.wirelessdesignasia.com /article-7128-acousticwavesensorsinfiltratetheautoindustry-Asia.html (1904 words)

	CAMEX-3 JPL Surface Acoustic Wave (SAW) Hygrometer
		The SAW hygrometer measures dewpoint by establishing equilibrium between evaporation and condensation on the surface of the SAW device.
		Using a SAW device as a fast, high-sensitivity moisture sensor, a feedback controller measures the condensation on the sensor surface, and responds by heating or cooling the sensor to maintain equilibrium.
		On the one hand, the presence of salt on the SAW surface may explain the tendency of the SAW hygrometer to measure dewpoint (as opposed to frostpoint).
	ghrc.msfc.nasa.gov:5721 /dataset_documents/dc8jplsaw_dataset.html (2434 words)

	Kauai Garden Island News (Site not responding. Last check: )
		The third of a series of strong waves crashed onto the bluffs near Queen's Bath at Princeville, and swept an already-badly-injured-and-incoherent John Jones into the sea, she said.
		Lynn Jones estimated the wave had to be 20 to 25 feet.
		Lynn Jones said they saw only one person, a man who shouted out and asked if they were OK, and said he would bring back help.
	www.kauaiworld.com /articles/2005/10/18/news/news04.txt (715 words)

	Surface Acoustic Wave
		The SAW touchscreen is a glass overlay with transmitting and receiving piezoelectric transducers for both the X and Y axes.
		These mechanical waves are directed across the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal.
		When the front surface of the touchscreen is touched, a portion of the mechanical wave is absorbed, thus changing the received signal.
	www.pixeltouch.com /saw.html (317 words)

	Advances in SAW technology
		The bandwidth of the SAW delay line second filter in the receiver is 1.5 MHz, and the filter response is close to that of a six-pole linear phase Bessel filter.
		The delay of a SAW delay line was used as a storage element to create a time diversity receiver while using its amplitude characteristics to perform a filtering function.
		The use of the same two SAW devices in both the receiver and the transmitter, in conjunction with a custom IC for the active functions, made it possible to include the entire transceiver in a 10.2 × 7.06 × 2.03mm surface-mount package.
	rfdesign.com /mag/radio_advances_saw_technology (3772 words)

	SenGenuity for Viscosity, Gas and Physical Sensors : SAW Technology : Rayleigh Surface Acoustic Wave Delay Line
		Because of this, the SAW is a very sensitive probe for measuring mechanical and electrical properties on its surface.
		The Rayleigh SAW is sensitive to mechanical and electrical properties occurring on its surface.
		Application of the Rayleigh SAW as a gas sensor is achieved by placing a gas specific sensing film on the surface of the device.
	www.visensors.com /tech_raleighSAW.html (576 words)

	SAW FILTER - Custom SAW Filter, SAW Filter Design, Surface Acoustic Wave SAW Filter, SAW Filter Manufacturing
		A SAW Filter allows radio frequency signals within the desired frequency band to pass through, but restricts radio frequency signals that are outside of the desired band or frequencies.
		As SAW Filters move to higher frequencies and smaller sizes, the SAW Filter packaging structure has an increasing effect on the electrical performance of the device.
		For instance a SAW Filter at 1960 MHz a full-wave simulation is first performed on an empty package; inductors are used to represent bond wires.
	www.filtro.net /saw-filter.htm (1093 words)

	Surface Acoustic Wave (SAW) Touchscreens
		SAW touch cannot be used within NEMA environments, as the technology cannot be gasket sealed.
		The waves are spread across the screen by bouncing off reflector arrays along the edges of the overlay and are detected by two "receivers".
		The acoustic wave weakens when the user touches the glass with their finger, gloved hand or soft stylus.
	www.vartechsystems.com /products/resources/surface-acoustic-wave-saw-touchscreens.asp (222 words)

	Wireless communication system using surface acoustic wave (SAW) single-phase unidirectional transducer (SPUDT) ...
		An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device.
		SAW is a passive thin film technology that does not require any bias current in order to function.
		A SPUDT-type SAW system according to the invention may be employed in the design of virtually any new short range wireless communication system, for example to enable communication between an earpiece unit and an associated mobile communications device.
	www.freepatentsonline.com /6462698.html (4980 words)

	SAW Filter General Information and Product Selection
		In designing a SAW Filter, the overall frequency response characteristics are determined by deriving two impulse responses for the two transducers whose transforms are added together in dB.
		From a SAW Filter design perspective, the first parameter to consider is the Fractional Bandwidth (Bp/Fo) because of the influence on the substrate material to be used in the design.
		Advances in SAW Filter design techniques routinely allow for a design incorporating a specification of under 10dB Insertion Loss, however, the minimum attainable Insertion Loss is generally influenced by the Fractional Bandwidth and the influences of this ratio on the applicable substrate material.
	www.oscilent.com /catalog/Category/saw_filter.htm (852 words)

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