光调制型光 IC 是一种带有 LED 驱动器的光 IC,具有检测信号光的功能,同时能与自己的发光周期同步。这种同步操作可以轻松消除低频背景光,因此即使在背景光下也能相对轻松检测出对象,并且几乎没有探测误差。
如果背景光不是很强,并且检测距离很长,那么我们建议使用高灵敏度型。但如果背景光较强,那么我们建议使用具有较高允许背景光量的类型。
可见光截止型对波长为 700 至 1100 nm 的光较为敏感(最大灵敏度波长:850 nm),因此建议使用发射波长为 800 至 950 nm 光的 LED。透明塑料封装型在 400 至 1100 nm 范围内具有较好的灵敏度(最大灵敏度波长:800 nm),因此可见光到红外线范围内的 LED 都是合适的。
这需要使用晶体管等安装外部放大器电路。驱动电流的占空比为 1:16,因此电流的设置应确保不会超过 LED 额定值。
需要采取相应的措施,例如交替布置 LED 和光调制型光 IC,并/或将孔安装在光 IC 正前方,使得仅接收光轴方向上的信号光。
流经导线的大瞬时电流可能导致在驱动 LED 时出现电压波动。有时,这会造成 IC 不稳定,从而导致运行故障。需要采取相应的措施,例如在光调制型光 IC 附近放置一个旁路电容器(约 0.1 μF),并在 LED 电源线中插入一个电容器(电解电容器等)以稳定功率。
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