无线传感器

Wireless sensor 

传感器具有纯无源、免维护、体积小、安装灵活等特点。可以很方便安装在被测点上，准确地测量发热点的实时温度，并以无线方式发送到采集器上，实现对被测点温度进行实时采集，实现非接触温度测量。

Sensor with a pure passive, free maintenance, small volume, flexible installation, etc. On the measuring point can be very convenient to install, to accurately measure real-time temperature of the hot spots, and sent to the collector in wireless way, realize the real-time acquisition, by measuring point temperature to realize noncontact temperature measurement. 

标准的温度采集过程，如下图所示，包括如下步骤：

Standard temperature acquisition process, as shown in the figure below, includes the following steps: 

无线读入器通过它的天线发射射频脉冲。脉冲信号被传感器上的天线收到后，通过叉指换能器 (IDT)在压电感应器的表面激活一个表面波。传感器表面波的频率由于受到传感器本身温度的影响发生了变化。正是由于频率受温度变化的机制，使得温度数据测量得以实现。IDT 再将表面波的频率振荡转化成射频信号。此射频信号由读入器上的天线收到后进行处理。由于谐振器的高质量特性，即使访问波具有50Hz 的带宽，也确保了反射回来的信号包含了精确的射频信息。反射回来的射频频率变化与温度的变化成比例关系。

Wireless reader antenna launch rf pulse through it. After the pulse signal received by the antenna on the sensor, through the fork refers to the transducer (IDT) over the surface of the piezoelectric sensors to activate a surface wave. Sensor surface wave frequency due to the influence of the temperature sensor itself has changed. It is due to the frequency by the mechanism of temperature change, make temperature measurements. IDT and surface wave frequency oscillation into rf signal. The rf signal by the reader antenna on receipt for processing. Due to high quality characteristics of resonator, even visit wave has 50 hz bandwidth, and ensures that the reflected signal contains precise radio frequency information. Reflected in the rf frequency changes with the changes in temperature is proportional to the relationship.