There are a number of different types of sensors which can be used as essential components in different designs for machine olfaction systems. Electronic Nose (or eNose) sensors belong to five categories, conductivity sensors, piezoelectric sensors, Metal Oxide Field Effect Transistors (MOSFETs), optical sensors, and these employing spectrometry-based sensing methods.
Conductivity sensors could be made up of metal oxide and polymer elements, each of which exhibit a change in resistance when subjected to Volatile Organic Compounds (VOCs). In this particular report only Metal Oxide Semi-conductor (MOS), Load Sensor and Quartz Crystal Microbalance (QCM) will likely be examined, as they are well researched, documented and established as vital element for various machine olfaction devices. The applying, where proposed device will likely be trained to analyse, will greatly influence the choice of sensor.
A torque sensor, torque transducer or torque meter is a device for measuring and recording the torque on a rotating system, like an engine, crankshaft, gearbox, transmission, rotor, a bicycle crank or cap torque tester. Static torque is fairly easy to measure. Dynamic torque, on the other hand, can be difficult to measure, because it generally requires transfer of some effect (electric, hydraulic or magnetic) from the shaft being measured to a static system.
One method to accomplish this would be to condition the shaft or even a member linked to the shaft with a number of permanent magnetic domains. The magnetic characteristics of those domains will vary according to the applied torque, and therefore could be measured using non-contact sensors. Such magnetoelastic torque sensors are generally utilized for in-vehicle applications on racecars, automobiles, aircraft, and hovercraft.
Commonly, torque sensors or torque transducers use strain gauges put on a rotating shaft or axle. With this particular method, a method to power the strain gauge bridge is necessary, in addition to a methods to receive the signal through the rotating shaft. This could be accomplished using slip rings, wireless telemetry, or rotary transformers. Newer types of torque transducers add conditioning electronics and an A/D converter towards the rotating shaft. Stator electronics then read the digital signals and convert those signals to Micro Load Cell, including /-10VDC.
A much more recent development is using SAW devices linked to the shaft and remotely interrogated. The strain on these tiny devices because the shaft flexes could be read remotely and output without making use of attached electronics on the shaft. The probable first use in volume will be in the automotive field as, of May 2009, Schott announced it has a SAW sensor package viable for in vehicle uses.
A different way to measure torque is by way of twist angle measurement or phase shift measurement, whereby the angle of twist resulting from applied torque is measured by utilizing two angular position sensors and measuring the phase angle between the two. This method is used inside the Allison T56 turboprop engine.
Finally, (as described within the abstract for all of us Patent 5257535), in the event the mechanical system involves the right angle gearbox, then this axial reaction force gone through by the inputting shaft/pinion can be associated with the torque experienced by the output shaft(s). The axial input stress must first be calibrated up against the output torque. The input stress can be simply measured via strain gauge measurement from the input pinion bearing housing. The output torque is easily measured employing a static torque meter.
The torque sensor can function like a mechanical fuse and is an important component to have accurate measurements. However, improper installing of the torque sensor can harm the device permanently, costing time and money. Hence, cdtgnt torque sensor needs to be properly installed to make certain better performance and longevity.
The performance and longevity in the torque sensor as well as its reading accuracy will be affected by the appearance of the Force Transducer. The shaft becomes unstable in the critical speed from the driveline and results in torsional vibration, which can damage the torque sensor. It is actually essential to direct the strain to an exact point for accurate torque measurement. This time is usually the weakest point of the sensor structure. Hence, the torque sensor is purposely created to be among the weaker components of the driveline.