简介：对于DF-11N反射式光电检测接近开关进行测试。对于它的检测距离进行测试。利用它的功能设置面板开关可以对于传感器的检测距离、是否输出消除抖动、输出信号的极性进行改动。

利用SP-45ML光电二极管对于DF-11N发送的红色光强信号进行测试，可以看到这是一个频率为14.23kHz的调制信号。

关键词： DF-11N，SP-45ML，光电调制，接近开关

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接近开关:DF-11N

文章目录

基本参数

上电测试

发送光信号

测量方法

测量结果

测试结论

§01 接近开关：DF-11N

一、基本参数

1、接口功能定义

接口引线定义：

棕色（Brown）： 12-24VDC
黑色（Black）： OUTPUT, 200mA
蓝色（Blue）：0V

▲ 图1.1.1 接近开关DF-11N

2、设置面板

在面板上有三个设置界面：

灵敏度设置
输出极性设置
输出回滞设置

▲ 图1.1.2 面板设置界面

(1) 灵敏度设置

灵敏度确定了监测距离。灵敏度越高，检测距离越远，反之，检测距离降低。

灵敏度设置：

顺时针旋转：灵敏度降低
逆时针旋转：灵敏度增加

(2) 输出极性设置

输出极性设置形式。输出是OC门形式。如果观察到输出电压则需要增加上拉电阻。器件的带动的最大负载电流200mA。

输出极性：

极性L：有物体输出为低电平，无物品则输出为高电平。
极性D：有物体输出为高电平，无物品则输出为低电平。

(3) 输出回滞设置

虽然设置为Timer，实际上就是设置检测是否回滞处理。这样可以减少输出脉冲的跳跃。

【Ⅰ.Timer设置off】

▲ 图1.3.3.1 Timer设置为OFF

【Ⅱ.Timer设置ON】

▲ 图1.3.3.2 Timer设置为ON

二、上电测试

1、工作电压

测试条件：

工作电压：12V
工作电流：14.5mA

2、检测距离

(1) 灵敏度最高

使用白纸进行反射，检测距离大约20厘米；
如果使用手指进行反射，检测距离大约13厘米；

(2) 灵敏度设置为中间位置

使用白纸进行反射，检测距离大约15厘米；
如果使用手指进行反射，检测距离大约10厘米；

(3) 灵敏度设置为2格

使用白纸进行反射，检测距离大约5厘米；
如果使用手指进行反射，则无法触发；

§02 发送光信号

肉眼可以观察到发送的红色激光信号。那么该信号是否有调制？

一、测量方法

1、测量模块

使用 SP-45ML光电二极管 对于DF-11N发送的光进行检测。在 SP-45ML光电二极管放大电路及其动态特性 测量SP-45ML的响应频带宽度应该大于25kHz。

▲ 图2.1.1 SP-45ML 光电检测模块

2、测量方式

使用光电纤维将DF-11N的发送的红色光导引到SP-45ML进行测。

▲ 图2.1.2 使用SP-45ML的导光线对准DF-11N输出光强

二、测量结果

如下是测量DF-11N发送的光强信号。可以看到这个信号是调制信号。根据SP-45ML的频率响应曲线，可以看到这个信号调制应该是一个50%的调制信号。调制频率14.23kHz。

▲ 图2.2.1 测量SP-45ML输出信号

※ 测试结论 ※

对于DF-11N反射式光电检测接近开关进行测试。对于它的检测距离进行测试。利用它的功能设置面板开关可以对于传感器的检测距离、是否输出消除抖动、输出信号的极性进行改动。

利用SP-45ML光电二极管对于DF-11N发送的红色光强信号进行测试，可以看到这是一个频率为14.23kHz的调制信号。

■ 相关文献链接:

SP-45ML光电二极管放大电路设计
SP-45ML光电二极管放大电路及其动态特性

● 相关图表链接:

图1.1.1 接近开关DF-11N
图1.1.2 面板设置界面
图1.3.3.1 Timer设置为OFF
图1.3.3.2 Timer设置为ON
图2.1.1 SP-45ML 光电检测模块
图2.1.2 使用SP-45ML的导光线对准DF-11N输出光强
图2.2.1 测量SP-45ML输出信号

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接近开关的初步测试： DF-11N

§01 接近开关：DF-11N