Why use a thru-beam sensor?

为何选择对射光束的传感器?。

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By electronic guidance of the radar beam this technology enables the sensor to fulfill several tasks at the same time while increasing the detection capability substantially.

通过采用电子制导雷达波束这一技术使传感器可以在同一时间完成多项任务，同时大大提高了检测能力。

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An optical mouse uses a beam of light and an optical sensor to detect movement over a surface -- there are no moving parts.

CNN: Review: Apple Pro Mouse

When sound waves enter the tube, the vibration of the droplets will cause the sensor to detect changes optically as the beam is disturbed, supposedly resulting in near-perfect vocal reproduction.

ENGADGET: Inventor patents laser microphone

Since there's no physical interface on the device to configure WiFi, the company's developed Blinkup, a way to enter SSID and password information on any iOS and Android smartphone and beam it to the Electric Imp's light sensor by rapidly pulsing the handset's screen on and off.

ENGADGET: Hands-on with the Electric Imp at Maker Faire (video)