#the sensor

The future car not merely cares about oil-economizing question, the most important one is the place where you want to go to send you Safety Ground. The traffic accident is often the topic that we discuss with rescuing, and the conclusion is often all come down to, we need improvement car navigating and security system. However, it is difficult to settle this problem well. For example, though Assist technology of OnStar of General Motors and BMW can offer very great help, but they generally need the aid of the mobile phone mobile communication network. The reality is, in a bit more remote area, the mobile phone signal is often insecure.

Fortunately a lot of automakers and government departments of various countries have been already setting about studying some newer technology, in order to offer more valid help to us in urgent cases. These new technologies are mainly concentrated in such aspects as new navigation system, emergency braking sensing system and car wireless communication system. In all these technology, sensor network (sensornetwork) Will play an important role, the meaning of its maximum will lie in preventing trouble before it happens. For example and driver send out severe weather, road control and drive a vehicle the prewarning of the accident to car in time, thus reduce possibility of the accident.

Safe Singapore side navigating turns towards the car

When and live in the routine work, the time that people stay in the means of transportation is longer and longer. So, the meaning of allocating the more convenient commercial facility for the car is greater and greater, because this will help we and family, colleague to obtain and get in touch in time, also help us to find the danger early. Moreover, the vehicle carried communicating device should also stand up with our commonly used personal communicating device integration, such as mobile phone, PDA,etc.. Because of the above-mentioned reason, a lot of experts believe, the vehicle carried communication system will enter a very high-speed developing period soon.

Alliance's group of Swiss fort (Baumer) Garrison in the Chinese market in more than one year, the business scope is expanded constantly. Sensor, motion control, visual technology, course instrument and viscose system,etc. are applied to the stream extensively, print packaging, die casting, medical treatment, medicine, semiconductor, textile, engineering machinery, every large trade such as water treatment, metallurgy, wood working, science and technology, food, chemistry, petrochemical industry, warm and open, public health, energy technology and laboratory equipment in environment protecting mode. The company adheres to " Cooperation, perfect, pioneer " Corporate culture,it is efficient without being relied on research and develop innovation,is it superior, the constant one is offering reliable and advanced products and solution to Chinese customer.

LEM has put out Minisens, miniaturization, integrated measurable quantity AC and DC electric current transducer. Frequency band range can be to 100KHz. This new sensor offers overall insulation (not need photosensitive resister) And highly sensitive (each ampere can export 20mV to 200mV) And there is no insertion loss. Can fix on the printed circuit board through SMD directly, reduce the equipment cost.

Key feature:

The insulation current of non-contact is measured, measurable quantity 70A is even higher. Insert automatically, the price is rich in the competitiveness The electric current of the high cost performance measures the scheme, promote energy efficiency on the electric and electronic application Can offer the previous cipher scheme of many kinds of effective schemes.

Minisens is a integration ASIC and Hall transducer of the magnetic field collection device, very direct measuring current, no need and magnetic core. The non-contact measuring way can avoid the restriction on the thing that the electric current measured the grade. The only limiting factor is a temperature behavior of the wire of primary side. Can measure the wire of PCB, space wire and bus-bar electric current of measurable quantity on or under minisens. It is even higher that limitless design can make minisens measure to 70A.

The parameter of a lot of ASIC can be passed on-chip the nonvolatile memory carry on the disposition, for instance: Regulate the gain to noise temperature ratio of the sensor, bias, polarity, temperature drift and rule of gain to noise temperature ratio (change or not influence with VDD proportion) ; Two kinds of different output base pins: A restriction noise with filter action, one does not have filter action, but 3 microseconds ahead of normal output of fast response time.

The grades of the electric insulation and degree of sensitivity of the output can be improved through the design of PCB, for instance: The layer different from IC of wire of primary side, can obtain good insulation, wire and IC and layer of primary side, can obtain more high degree of sensitivity. Standard PCB assembling process, minimize the manufacturing cost.

Minisens adopts 5V to supply power. In order to minimize the energy loss, can minimize the chip dissipation by Standby mode that oneself carry. The sensor is and capsulate by the cmos process it is SO8.

Recently, Ge transport, build " the multidimensional study and application of force sensor " that researcher preside over by the intersection of Chinese Academy of Sciences and the intersection of Hefei and intelligence Scientific and technological assessment of results organizing through the scientific and technological drawing room of Anhui Province. Evaluation committee members are from coming from the association of software industry of the computer of Anhui Province, China Science & Technology University, Chinese electron are scientific and technological 38 groups, Anhui university, multidigit expert of the institute of electronic engineering of PLA make up.

This project has proposed the sextuple force sensor of the E-shaped diaphragm, frame type and meant methods such as the force sensor, integrated sextuple strength test platform,etc. and constructional design for the first time, and develop the relevant prototype machine; The ones that develop, because of microelectromechanical systems (Micro Electrict Mechanic System) Multi-functional skin sensor of array type, digital shot, digital dip compass on the basis of multidimensional strength / much Vega's speed pickups are the originality achievement with totally independent intellectual property right; Intelligence of the ones that develop using under terminal environments such as the spaceflight and ocean based on sextuple wrist force sensor,etc. for China in dynamic characteristic research results of force sensor of sextuple wrist of the robot Study important meaning in robot control; Because of achievements such as the sextuple strength test platforms and digital shots,etc., get real application in sports training, have offered scientific basis for the fact that Chinese athletes prepared for the Olympic Games, improved weight lifting and throwing level.

Recently, one U.S.A. develops a rescue robot to call uBOT-5 in a laboratory, can find have patients fall in a swoon, can carry on some essential inspections, for instance blood pressure, heartbeat,etc., later put through emergency call 911 rapidly, and all these offered very important help for first aid.

The sensor located in header of the robot can check whether someone goes into a coma, besides function such as first aid, uBOT-5 can also remind patients to take medicine, or help patients to fetch the things, do some cleaning,etc., because the interlinkage that the robot can be convenient gets to Internet, so doctors can control the patient when real through network lens, microphone, very touch-type LCD display screen, understand the patient's state,etc..

Understand after a simulation signal path, the number system developer can be from various application, catch the sensor data more accurately. Main point Even it may have different outputs that the same manufacturer is similar to the sensor, and these differences will bring the trouble to system artificer. The noise comes from many kinds of reasons, including the CIBOL, radio frequency, thermoelement, even sensor. The signal using the sensor to strain the wave rear, must use ADC, will imitate the semaphore and turn a digital signal. Can choose to adopt and connect ADC, can adopt the microcontroller of built-in ADC too. There is higher precision to connect ADC, there is a better characteristic in speed and definition. Sensor multi-place apply the embedded systems to more and more. Though the industrial products have been using it for making control system all the time for a long time, but consume the apparatus and begin to adopt the sensor now. The manufacturers integrated sensor in the consumer products, in order to create good users experience, if increase the accelerometer in the mobile phone, and add vaporized sensor,etc. into microwave oven. The system artificer who worked only in the digital domain in the past finds now, must have dealings with analog sensor by oneself.

Fig. 1, the simulation signal path of a sensor can be divided into several grades: Enlarge, filter and digitization.

Analog signal of the sensor must for the system to use digitizing, and signal take process amplify, filter and digitization ' Fig. 1) . Every grade usually involves a device around some passive components, by realizing a application correctly. Once do digitization to the signal, can give the control system of the microprocessor of it, or put the data in order, send to a host processor through a communication protocol. The agreement can use the sensor data depending upon need. Each sensor has different outcoming signals and ranges. The signal outputted can be voltage, electric current, resistance, electric capacity or frequency, but hardly there is any standard, there is only dedicated industry's systematic inuse, they. Even it can have different outputs that the same manufacturer is similar to the sensor, and these differences will bring some trouble to system artificer. The artificer meets system's demands while choosing the sensor. But if the demand present, change during design, sensor take, make modification too then. In addition, one must output slightly different new sensors to the amplifier stage and strain the wave scale to change. Most sensors output the electric current or voltage signal of a low level, so a simple resistor network can turn signal of any electric current into a voltage. Some concepts and component selection procedure of simple description of this text. Range One output of sensor can low to several, can also so as to up to several volts. In order to accomplish accurate digitization, the signal must be enough large for ADC, could read out effectively. Under most situations, the sensor signals all need amplifying. For example one typical the intersection of Model K and thermocouple export as 41μ V / degrees of C, the intersection of design and in need of a degree of C graininess of you, need to do equivalent magnification. So, must consider the definition of ADC, in order to guarantee to enlarge the signal to meeting required graininess. Mainly depend on the required type to the choice of the amplifier, for example amplifier of an instrument, difference amplifier, operation amplifier, PGA ' Programmable gain amplifier) . In addition must also confirm the amplifier required gain magnitude. Amplifier around resistor network ( The tape is feedbacked) Have determined the gain to noise temperature ratio of the amplifier. Under the ideal situation, the maximum gain of the reference amplifier is limitless. Usually presume the gain to noise temperature ratio of PGA for the digital signal of the device. This signal has changed the internal resistor network. The gain to noise temperature ratio of maximum likelihood of a PGA expires by 1/2 for 1‰ of the traditional amplifier, but this section can be accepted under most situations. Must also consider another important specification as to the amplifier: Offset voltage. Voltage changed when the offset voltage is a signal passing amplifier. For example, if give a unit gain to noise temperature ratio (the gain to noise temperature ratio is 1) a 500 mV signal Amplifier,offset voltage as 10 mV,there are 510 mV on what has been received output. If the output area of the sensor is 0 to 900 mV, but the system does not need very delicate sensor reading, then this deviation can be ignored. If the range of the sensor is from 450 mV to 550 mV, maybe this deviation is unacceptable. The smaller the offset voltage is, the more expensive the amplifier is. All amplifiers are deflected, but you need to know whether the system can tolerate it. Can reduce or dispel the offset voltage with relevant pair of sampling techniques. Filter All systems will superpose some noises in the sensor signal. The noise source has all respects, including the CIBOL, radio frequency, thermoelement, even sensor. The signal noise will make the reading of ADC not accurate and unstable, noise level will be strengthened in the amplifier, because the amplifier can amplify the error in signals. The signal noise can be divided into low frequency, high frequency or a certain known frequency. It is the high frequency noise problem to be the usually to be most solved.

Fig. 2, include amplifier, electric-wave filter and ADC in the signal path of the sensor. Designing to remove the noise in signals of electric-wave filter, limit the bandwidth.