ACCELEROMETERST Sensor Fusion Solution(iNemo Engine)iNEMO Sensor Fusion is a new advanced filtering and predictive software suitethat uses sophisticated algorithms to integrate outputs from multiple MEMSsensors.ACCELEROMETERProduct OverviewBased on the Kalman filter theory, ST’s iNEMO engine SensorFusion Software suite employs a set of adaptive predictionand filtering algorithms that make sense of all of the complexinformation coming from multiple sensing devices, includingaccelerometers, gyroscopes, compasses and pressuresensors.The software eliminates or minimizes the impact of intrinsicand external noise and the dynamic distortion of eachdevice. It also compensates for the magnetic distortion of themagnetic sensor and the inherent drift of the gyroscope.The family of ST sensor-fusion product lines includes iNEMOEngine Lite which is a free source-code software library formotion-detection system evaluation, and iNEMO Engine Prowhich consists of compiled software libraries with data-fusionalgorithms for multiple sensor output processing.The iNEMO engine is compatible with all MEMS sensors.WHATdigital filtering algorithms to compensatethe disadvantages of each individualsensor and then output accurate dynamicattitude information pitch/roll/heading12Documentation and Software AvailableMEMS product catalog and datasheetsTechnical documentation•§Application notes•§Technical notes on package surface mountingEvaluation boardsLow-level drivers (platform independent)HOWtake each sensor measurement dataas input and then apply digital filteringalgorithms to compensate each otherand output accurate and responsivedynamic attitude resultséHeading or Orientation is immune to environmentalmagnetic disturbance as to the bias drift of the gyroscopewww.FutureElectronics.com/Sensors
ACOUSTICWhat is an acoustic sensor?Acoustic sensors detect sound, or mechanical vibration,producing an electrical signal representing the sound orvibration detected. Some types of acoustic sensors candetect frequencies beyond the range of human hearing, forexample ultrasonic sensors, and shock sensors. In somecases, and often with ultrasonic sensors, the sensor elementcan also serve as a transducer, which can emit sound givenan electrical stimulus.Ultrasonic sensors (also known as transducers when bothsend and receive) work on a principle similar to radar orsonar which evaluates attributes of a target by interpretingthe echoes from radio or sound waves respectively.Ultrasonic sensors generate high frequency sound wavesand evaluate the echo which is received back by the sensor.For distance sensing, the sensors calculate the time intervalbetween sending the signal and receiving the echo todetermine the distance to an object.Another example of acoustic sensor is silicon microphone,also known as MEMS (MicroElectrical-Mechanical System)microphone as the pressure sensitive diaphragm is etcheddirectly into silicon through MEMS processing technology.With the help of advanced MEMS processing technologies,silicon microphone offers advantages of smaller size andhigher overall performance compared to the popular electretcondenser microphone.ApplicationCasesDistanceNDTLevel sensingReal Life ExamplesFish finderMobile robots & autonomousmobile systemsIndustrial or undergroundpipeline inspectionConcrete structure inspectionOil Tank level detectionImportant selection parametersSensitivity is a measure of the weakest detectable soundfield strength, in decibels. For silicon microphones, sensitivityis a measure of the microphone output response to theacoustic pressure of a 1kHz 94dB SPL (1Pa RMS) sinewave. It is referenced to the output Full Scale Range (FSR) ofthe microphone.Sound Pressure Level (SPL) is defined as the level of thepressure deviation from the local ambient pressure causedby sound waves. It indicates the loudness of sound, indecibels (dBSPL).Signal-to-Noise Ratio (SNR) is a measure of the differencein level between the output response of a 1kHz 94dB SPL(1Pa) sine wave and the idle noise output, in decibels (dB).Typical applicationsSilicon microphones are gaining popularity due to the smallsize and overall performance compared to other typesof traditional microphone technologies, especially in highdensity and high performance applications like cell phones,cameras, audio players and accessories.Ultrasonic sensors are widely used in two-dimensionalpositioning, object/motion detection, and distancemeasurement. The latest applications include liquid levelsensing, Nondestructive Testing (NDT) and high performanceultrasonic sensing systems for mobile robots or autonomousmobile systems. In Nondestructive Testing, ultrasonicsensors are used for non-contact inspection of compositematerials, aluminum, and plastics for defects, cracks, ordelamination. Because contact is unnecessary, the sensorscan also be used to inspect material or products on a movingassembly line or in applications in which contamination is aconcern.ACOUSTIC13www.FutureElectronics.com/Sensors
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