Digital sensor system

Fig. 6.12. Block diagram of the digital sensor system architecture...

The output of the sensor system delivers a digital signal- The sensor is supplied with 5VDC via a coded RAST 2.5 plug connection. The sensor consists of water resistant material and is therefore especially suitable for the use in household appliances Like dishwashers or washing machines. 

The fabrication of the sensor system was described in Sect. 4.1.2, since this microsystem also features a circular microhotplate. A micrograph of the complete microsystem (die size 6.8 x 4.7 mm ) is shown in Fig. 5.2. The microhotplate is located in the upper section of the chip. The analog circuitry and the A/D and D/A converters are clearly separated and shielded from the digital circuitry. The bulk-chip temperature sensor is located close to the analog circuitry in the center of the chip. The distance between microhotplate and circuitry is comparatively large owing to packaging requirements, as will be explained in Sect. 5.1.6. 

H. Uchida, W.Y. Zhang and T. Katsube, High speed chemical image sensor with digital LAPS system, Sens. Actuators B Chem., 34(1-3) (1996) 446-449. 

Figure 15 shows the schematic diagram of a typical sensor system. The CTL-based sensor element is fixed with pins to connectors for heater lead and thermocouple in the sensor cell. The temperature of the sensor is monitored by the thermocouple and is controlled by a digital temperature controller. The sample gas in the sensor cell is aspirated by an air pump downstream of the... 

Functional oxide materials play an important role for applications in microwave communication and sensor systems. Whereas silicon and GaAs represent the basic materials for the digital part of communication and sensor systems, the analogue parts require high quality factors and low losses, which cannot be fulfilled by semiconductors. Oxide insulators provide extremely low microwave losses expressed by the value of its loss tangent tan 5 = Im(er)/Re(er). The functionality of oxides in microwave devices or circuits can be classified as follows ... 

Fig. 7.11.24 Block diagram for a digital steering-angle sensor system with two microcontrollers (source Valeo)...

L. Luan, R.D. Evans, D. Schwiim, R.B. Fair, and N.M. Jokerst, Chip scale integration of optical microresonator sensors with digital microfluidics systems, LEOS-2008, Newport Beach, CA, Nov. 9-13 (2008). 

Today, the job of the mine hoist brake system designer is made easier since SIL certified electrical and electronic components are now more widely available. Most of the major PLC manufacturers now have SIL 3 certified PLC systems. More and more SIL 3 certified sensors such as speed encoders are also available as is SIL 3 digital communication systems. 

The CAREM reactor is designed with a distributed digital control system. Sensor signals are digitalized and fed to micro-processors. These microprocessors are placed as close to the field as possible. Microprocessors communicate with each other through a redundant network. The man-machine interface is connected to the same network. 

Single Lens Reflex (SLR) Mechanical mirror system in a film or digital camera that reflects the light entering the lens so that the view through the camera s eyepiece matches the scene recorded on the film or digital sensor. 

The materials and structures associated with primary sensors contain dissipative, storage and inertial elements. These translate into the time derivatives appearing in the differential equation that models the sensor system. Hence another major defect is represented by the time (or frequency) response. The means to neutralise this imperfection involves filtering, which may be thought of in terms of pole-zero cancelation. If the device has a frequency response H s) then a cascaded filter of response G s) = 1/H s) will compensate for the non-ideal time response. The realisation of such a filter in analogue form presents a major obstacle that is greatly diminished in the digital case. 

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