z**n
发帖数: 22303 | 1 【 以下文字转载自 PhotoGear 讨论区 】
发信人: zoun (zoun), 信区: PhotoGear
标 题: 大牛们看看这个rain sensor啥工作原理啊？
发信站: BBS 未名空间站 (Thu Apr 14 01:14:31 2011, 美东) | g******u
发帖数: 3060 | 2 这种最容易做了,买个infrared sensor用555做块电路,几毛钱的成本. | C**e
发帖数: 97 | 3 "
.....
The optical system used by most rain sensors consists of a light emitting
diode
(LED), a light receiving diode (LRD), an ambient light sensor, an electronic
control unit (ECU), and several lenses (Fig. 7.14.2). Light from the LED is
reflected at the outer surface of the windshield at the angle of total
reflection. The angle has to be between 42 (glass-air) and 63 (glasswater).
If water is on the windshield, some of the light is coupled out and this
causes a reduced current from the LRD, which is evaluated by the electronics.
.....
"
【在 z**n 的大作中提到】
: 【 以下文字转载自 PhotoGear 讨论区 】
: 发信人: zoun (zoun), 信区: PhotoGear
: 标 题: 大牛们看看这个rain sensor啥工作原理啊？
: 发信站: BBS 未名空间站 (Thu Apr 14 01:14:31 2011, 美东)
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