Accelerometers
(49 Companies)
Sensors used in the measurement and analyzing of vibration, shock and acceleration.
Contain piezoelectric elements and do not contain conventional electromagnetic coils. Uses of these devices are found in alarms, sirens, ringers, signaling devices, etc.
Produce an audible output that can vary according to tone type, audio frequency, and sound pressure. These components are found in alarms, sirens, audio alerts and other audible warning devices.
Audio amplifiers amplify low-power audio frequency signals, normally frequencies between 20 Hz–20 KHz, to levels suitable for driving loudspeakers and are the final stage in a typical audio playback chain.
Transformer-like device that uses saturation of magnetic materials to produce amplification. Non-electronic amplifier with no moving parts. Bandwidth extends to the hundreds of kilohertz. Amplifier used extensively in early switched-mode power supplies.
An audio attenuator placed in the preamp chain or after the power amplifier. Uses electrical resistance to reduce the amplitude of the signal that reaches the speaker and lower the volume of audio output level.
Used as aural alarm element. May be piezoelectric or electromagnetic. Piezoelectric sounders use metal plate that vibrates with expansion/contraction of piezoceramic element; electromagnetic sounders produce single continuous sound/intermittent tones.
Electromechanical devices that can be attached to a shaft to produce a series of pulses indicating shaft position. Encoders often used in industrial servo control applications.
Magnetic strip encoders are used, most commonly, to create controlled access or identification cards and systems. The encoder modifies the magnetism of iron-based magnetic particles on a band of magnetic material, thus activating the strip or card.
Programmable encoders encrypt or translate input codes using pre-programmed algorithms. Programmable encoders either perform with analog circuitry or digitally.
Contacting encoders have two major parts in their construction–the coded element and a contacting sensor. Switches close/open as the encoder is turned. Movement of the contacting sensor with respect to the coded element produces a digital output signal.
Magnetic shaft encoders convert the angular position of an axle to a code, but use strips of magnetized metal to be sensed by a Hall-effect transducer or sensor that detect and process the code.
Optical rotary encoders use a glass disk with both transparent and opaque areas that are read when a light is shined on the disk. A microprocessor evaluates the pattern and determines the angle of the shaft.
Equalizers are adjustable filters that compensate for unequal audio frequency response. Mixers combine audio signals. Bridges mix multiple inputs and feed back composite audio. Crossovers are networks that filter signals into separate frequency bands.
Gauges, Strain
(59 Companies)
A strain gage is a sensor whose resistance varies with applied force. It converts force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured.
A Hall effect generator creates an output voltage proportional to the magnetic field strength from a current flow. The Hall effect is used in various sensor devices e.g. for rotating speed, fluid flow, current, pressure, etc.
Headphones refer to a pair of tiny speakers worn over the ears. When phones are connected to source this allows user to listen to audio. A headset is a microphone/headphone used in telecommunications. Chestsets used with headsets and allow portability.
Loudspeakers, or speakers, are electro-acoustical transducers that convert an electrical signal to sound. May also refer to a complete system consisting of an enclosure, one or more drivers, and electrical filter components.
Pertains to all the accessories that are used with microphones in audio systems. Including microphone stands, holders, booms, windscreens, covers, pop filters, etc.
Directional microphones, or unidirectional microphones, are sensitive to sounds from only one direction. Spatial response patterns are of the cardioid type, with a narrow microphone response area directly in front of the announcer.
Filters out ambient noise from desired sound e.g. in aircraft cockpits. A separate diaphragm picks up ambient noise without picking up intended signal. Then one diaphragm combines out of phase with intended signal from another diaphragm to cancel noise.
Microphones which are sensitive to audio inputs from all spatial directions. Applications include consumer electronics, choral groups, voice communications, musical instruments, transportation, etc.
Subminiature microphones are very small microphones that often have directional characteristics. Usually may be portable and frequently of the wireless type. Many times they are used by performers for ease of mobility.
A device used to transform sound energy into electrical energy. Sensor utilizes electromechanical, MEMS, ultrasonics, and other technologies. Applications include military, security audio, range detection, material thickness and/or contamination, etc.
A device used to detect speed or velocity of air and convert indication into electrical signals. Sensors may utilize balometers with flow hoods. Applications include medical, HVAC, fuel-to-air ratio sensing, environmental testing, leak detection, etc.
Angle measuring sensors are used to determine orientation/direction of a particular object. May incorporate position, tilt, inertial devices, etc. Applications include construction industry, material handling, military, robotics, transportation, etc.
Used in the determination and recognizability of specific human physiological characteristics. Sensors can be used to analyze fingerprints, facial forms, hand geometry, hand veins, eyes, voice, DNA, etc. to determine a person's identity.
Detect physical properties of specific target chemicals. Sensed quantities include volume, density, signature or spectra, conductivity, heat capacity, temperature, refractive index, etc. Applications include medical, environmental testing, security, etc.
Sensors, Gas
(30 Companies)
Devices used to provide in-line flow sensing to gases and mass flow. Sensed quantities include flow rate, volume, density, leakage, signature or spectra, etc. Applications include medical, HVAC, environmental testing, security, etc.
A Hall effect sensor is a transducer that varies its output in response to slight changes in magnetic fields. Commonly used for proximity switching, positioning, pressure, speed detection, fluid flow, and current sensing.
Sensors, Image
(46 Companies)
Device that converts an optical image to an electric signal. Used mostly in digital cameras and other imaging devices. Sensor is typically a CCD or a CMOS active-pixel sensor.
Sensors, Light
(53 Companies)
Light sensors, or photodetectors, change light resistance, or produce voltage/current when detecting presence/absence of light source. Applications include photography, communications, military, fiber optics, security, robotics, transportation, etc.
Detect relative air humidity or water vapor content. Sensors convert humidity changes into resistance variation and then into an electrical current or differential electrical signal. Applications include agriculture, environmental testing, metrology, etc.
Sensors, Reed
(10 Companies)
Generic sensor device built using a reed switch. Hermetically sealed and immune to dust and moisture. Applications include shock, vibration, inclination, pressure, flow, telecommunications, security, hydraulics, level sensing, pneumatics, automotive, etc.
Current sensors detect either AC or DC electrical currents in wire/cable and then generate proportional signals. Current sensors can detect analog and unipolar outputs in AC currents and unipolar, bipolar, and digital output in DC currents.
Liquid flow sensors/transducers determine the velocity flow or quantity of moving fluid. Probe devices interface with moving fluid in-line, insertion, or non-invasive. Common liquid flow indicators include flow sensors, mass flow sensors, and flow meters.
Commonly found in the automotive, hydraulics, chemical, petroleum, etc. industries. Sensors/transducers utilize magnetic, mechanical or pneumatic principles depending upon physical material to be detected.
Pressure sensors/transducers measure pressures of gases and liquids and generates proportional signal. References are absolute, gauge, vacuum, differential and sealed. Technologies used are mechanical deflection, strain gauge, MEMS, piezoelectric, etc.
Detect the presence of near-by objects without any physical contact. Proximity sensors/transducers are generally designed using technology of infrared, or acoustic, or capacitive, or inductive sensing.
Temperature sensors/transducers determine temperature by sensing some physical characteristic, e.g. electrical resistance, EMF, or thermal radiation. Technologies include thermistors, thermocouples, resistance temperature detectors, bimetal switches, etc.
Vibration sensors/transducers measure linear velocity, acceleration, and displacement. They can have from one axis to three axes of measurement. Tilt sensors measure tilting of two axes of a reference plane.
Computer speakers, or multimedia speakers, are small external speakers commonly equipped with a low-power internal amplifier.
High fidelity speakers is a term used by stereo listeners and audiophiles to refer to speakers of high-quality fidelity (frequency response, power handling, etc.) to reproduce sound that is very faithful to the original master recording.
Small speakers that have a relatively low depth in cross section. Usually found in telephones, portable devices, headsets, etc.
General purpose replacement speakers refer to substitute speakers used to replace existing units that are old, defective, etc. Often substituted for use in consumer electronics e.g. radios, automobiles, intercoms, musical instruments, etc.
Subminiature speakers are very small effective speakers. They are used in a variety of items, including personal listening devices and other small electronics. Most are small and button-shaped, but they can come in a variety of ways.
Couple audio data into a form enabling a speaker to produce the sound quality. These transducers may contain either electromagnetic or piezoelectric elements for operation.
Displacement transducers indicate distance traveled by object relative to rest position. Usually transducer converts movement of rod or armature into electrical energy. Transducers used in hydraulics, automotive, aerospace, geological applications, etc.
Transducers convert tension, compression, and shear forces into a voltage that can be measured. Commonly detected by allowing an elastic member on the object to deflect or expand, and then measure the positional change with a displacement-type sensor.
Humidity transducers measure relative air humidity or water vapor content. These transducers convert humidity changes into a resistance variation, altering signals received into electrical currents or differential electrical signals.
Inertial transducers convert acceleration, vibration, inclination changes into electrical signals. May use reaction forces on internal mass/spring to produce detectable force. Often used in navigation, aerospace, geological, military, applications, etc.
Pickup devices act as transducers that capture magnetic changes (e.g. Hall effect sensors), or mechanical vibrations, and convert them to electrical signals.
Operate using contraction or expansion of a rod of ferromagnetic material, such as iron, nickel, or cobalt, in a magnetic field. Components used in factory automation, servo controls, and electrical actuation of linear motors.
Piezoelectric transducers are generic transducers whose operation depends on piezoelectric effect (generate mechanical deformation under influence of electric field and vice versa). Used in numerous applications, e.g. acoustics, instrumentation, etc.
Measure position and convert the data into a form for transmission as a feedback signal. Devices used in medical applications, automotive industries, automation, hydraulics, military, etc.
Sonic and ultrasonic transducers generate high frequency sound waves and evaluate delay in received echo. Used in diverse applications, e.g. weather, motion, medicine, testing, distance, hydraulics, military, aerospace, etc.
Torque transducers convert torque (either static or dynamic) of a rotating system. Most torque transducers use strain gauges to create power bridge between sensor and object on pickup. Used in applications for mechanical power, speed, force, testing, etc.
A transducer which generates an output proportional to the velocity. May consist of coil with a suspended magnet from one end and surrounded by conductive coil. Movement of transducer imparts movement of the object which generates an electrical current.
Volt, watt, current, VAR, power factor, and frequency transducers measure AC and DC currents and then emit corresponding electrical signals based upon the level of voltage, wattage, VAR, power factor, and frequency in the measurement.
Process control transmitters collect/evaluate parametric data based upon conditions in a system. The transmitter alerts users to possible concerns at remote monitoring areas and process measurement points for changes in pressure, temperature, flow, etc.
Valve positioners compare a control signal received from a valve actuator, analyzes the signal, and responds by moving the actuator to correspond to the received signal. Indicators/transmitters receive/send appropriate signals within the valve.
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