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| 型号： | USB-100 |
| 厂商： | Fujitsu Semiconductor America Inc |
| 文件页数： | 93/143页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER FOR USB |
| 标准包装： | 1 |
| 类型： | MCU |
| 适用于相关产品： | MB91F662 |
| 所含物品： | 板，线缆 |
| 产品目录页面： | 722 (CN2011-ZH PDF) |
| 相关产品： | 865-1099-ND - IC MCU 512KB FLASH FR80 120-LQFP |
| 其它名称： | 865-1108 |
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6
Humidity sensor
6.1 What is humidity?
In the winter, our hands and skin tend to dry, and our throats easily become sore.
Conversely, in areas where rain season occurs, the humidity tends to cause discomfort.
And those who hang dry their laundry no doubt pay attention to the humidity level in
weather reports.
Humidity represents the ratio of moisture in the air. The history of hygrometers used
to measure humidity is said to have started with the hair hygrometer, which utilizes the
elasticity of hair. Today, in addition to hair hygrometers, inexpensive wet and dry bulb
hygrometers are available and used in common households.
Humidity is often referred to in units of "relative humidity" (units: %RH), which is
defined as the ratio of water vapor pressure in air at a prescribed temperature, to the
saturated vapor pressure at the same temperature, expressed as a percentage.
Weather forecasts usually mention "percentage" alone, but the abbreviation for relative
humidity is implied.
Other units used to refer to humidity include, wet-bulb temperature (units: °C), dew
point temperature (units: °C), and water vapor content (units: ppmV for ratio by volume,
and ppmW for volume by weight).
This text will express humidity in terms of relative humidity (%).
6.2 What is a humidity sensor?
The humidity sensor was developed as a replacement for the hygrometer. Humidity
sensors are used in air-conditioner temperature controls for offices and factories.
Recent air conditioners for homes with dehumidifier and humidifier functions also make
use of humidity sensors. Some microwave ovens use humidity sensors to control
cooking temperature and time by detecting the amount of water vapor emitted from the
heated food.
A humidity sensor uses the change in electrical properties caused by absorbing and
releasing moisture in the air. Because the sensor is constantly exposed to air, it is easily
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相关PDF资料 |
PDF描述 |
|---|---|
| USBMLCF | USB BDM INTERFACE MC P&E |
| USBMLPPCBDM | MULTILINK P&E POWERPC USB |
| V-9767-L | DOOR ECONOGLAS 19" LOCKING |
| VC-9931 | CABINT VISNCB 20.54X23.62X23.62" |
| VC-9934B | VISIONCAB B 35.40X23.62X23.62" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| USB10-0001 | 制造商:Black Box Corporation 功能描述:USB 2.0 COILED CABLE 1 "A" MALE TO "B" MALE |
| USB10-0002 | 制造商:Black Box Corporation 功能描述:USB 2.0 COILED CABLE 2 "A" MALE TO "B" MALE |
| USB10-0003 | 制造商:Black Box Corporation 功能描述:USB 2.0 COILED CABLE 3 "A" MALE TO "B" MALE |
| USB100EVAL | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| USB1015-GF-N-A | 制造商:Global Connector Technology (GCT) 功能描述:USB1015 Serie gold Flash Nylon 9T USB Connector 制造商:Global Connector Technology (GCT) 功能描述:USB A Skt, Mid-TH, R/A, GF, offset 3.9mm, W/shell stake, T&R |
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