casio PRG系列传感器工作原理

http://www.casio-intl.com/wat/protrek/images/sensors_logo.gif' />Direction sensor
This magnetic sensor employs two perpendicularly intersecting internal coils with a centrally located MR (magnetic resistance) element to sense geomagnetism (a magnetic force traversing Earth in the north/south direction) and use it to determine directions. An MR element is a resistance element whose resistance characteristically changes depending on the strength of the magnetic force. It is structured such that its sensing power varies with the geomagnetic angle.
http://www.casio-intl.com/wat/protrek/images/shim.gif' /> The MR element employed by the direction sensor is insufficient, because the geomagnetism is weak and the directivity complicated. Two sets of coils have consequently been adopted to divide the components into a more rational, right-angled, two-directional intersection. When the MR element detects the various components, a microprocessor processes the voltage signals received as the resistance changes and determines the direction.

http://www.casio-intl.com/wat/protrek/images/direction.gif' />http://www.casio-intl.com/products/images/spacer.gif' />Pressure sensor
The pressure sensor employs the "piezo effect" of the resistance change occurring when four diffusion resistances arranged on a silicon base are distorted to measure pressure.
http://www.casio-intl.com/wat/protrek/images/shim.gif' /> Outside pressure on the silicon base depresses the surface because of its flexibility and its internal vacuum structure. The diffusion resistance expands in accordance with the movement of the base and the changes in resistance. Since this diffusion resistance is included in the circuit through which a fixed electric current passes, a voltage difference occurs before and after the resistance. Atmospheric pressure and water pressure are computed by digitizing this voltage difference with the A/D converter and processing it by microprocessor.*
http://www.casio-intl.com/wat/protrek/images/shim.gif' /> *The microprocessor incorporates data on the International Standard Atmosphere (ISA) defined by the International Civil Aviation Organization (ICAO). It compares this with the atmospheric pressure information collected to make high-level conversions instantaneously.

http://www.casio-intl.com/wat/protrek/images/pressure.gif' />http://www.casio-intl.com/products/images/spacer.gif' />Temperature sensor
The PROTREK Thermosensor's temperature sensor converts voltages specified by the resistance at the current temperature into a frequency by means of a frequency conversion circuit (CR oscillation circuit). A microprocessor receives the frequency signals, processes them and employs the results to compute the temperature.
http://www.casio-intl.com/wat/protrek/images/shim.gif' /> * The Triple Sensor and Twin Sensor are equipped with an A/D converter for pressure measurement that they use to transform the pressure difference before and after thermistor measurement to digital signals, which they then process with a microprocessor to determine the temperature.

http://www.casio-intl.com/wat/protrek/images/temperature01.gif' />
http://www.casio-intl.com/wat/protrek/images/temperature02.gif' />
http://www.casio-intl.com/wat/protrek/images/temperature03.gif' />http://www.casio-intl.com/products/images/spacer.gif' />http://www.casio-intl.com/products/images/spacer.gif' />

方向传感器这种磁场传感器采用两个垂直相交的内部线圈与一个位于黄(磁电阻)元件,以 地磁感(磁力穿越地球的北/南方向) ,并用它来确定方向. 何一个因素是一个阻力因素,其阻力特性的变化取决于国力的强大磁力. 它的结构是这样,它的传感功率随磁场角度. 陈元受雇于风向传感器是不够的,因为地磁是弱者和方向性复杂. 两套线圈,因而采用隔膜组成成一个更加理性,直角,双向路口. 当单分子检测的各个部分, 微处理器过程中的电压信号接到的电阻变化,并确定了方向.

压力传感器压力传感器使用"piezo effect" 抵抗变动发生当四扩散抵抗被安排在硅基地被变形测量压力。 外部压力在硅基地压下表面由于它的灵活性和它的内部真空结构。扩散抵抗扩展与基地的运动和变化符合在抵抗上。因为这扩散抵抗包括在固定的电流通过的电路, 电压区别发生在抵抗前后。大气压和水压由数字化这个电压区别与A/D 交换器和处理计算它由微处理器。* * 微处理器合并关于国际标准大气的数据(ISA) 由国际民航组织定义(ICAO) 。它这与大气压信息比较被收集瞬间地做高级转换。

温度传感器的protrek thermosensor的温度传感器电压转换指定的阻力,在目前的温度成频率 采用了变频电路(铬振荡电路) . 微处理器接收频率信号,进程和他们雇用的结果计算温度. *三重传感器和双传感器装有一个模/数转换器的压力测量,他们利用 变换压差前后热敏电阻测量数字信号 然后进程,以微处理器,以确定温度.

好贴，不顶不行~~~~~
正想了解一下呢~~~

英文都能翻译，太有才了兄弟。

是用在线翻译的，要不然，只能看懂50％

请楼主找一些如何调走时准确度的资料译一下吧，多谢了！

太好了,谢谢分享

谢谢 班主太厉害了:):):):)

好像仅仅温度信号是要进行A/D转换后处理的 估计是为了避免传输损耗吧

支持支持

强贴！！知识就是力量啊，看来高手无处不在

好专业，版主好厉害！！！！

好贴，真好想研究一下~