
FAQ on Laser Sensors for Distance Measurement
常见问题
通过“距离范围近”和“距离范围远”参数可以隐藏工作区域的某些区域。在这些区域不分析任何信号。例如,可以隐藏传感器观察的玻璃板。为此,将“距离范围近”放在玻璃板后面。如果背景存在干扰性物体,通过缩小“距离范围远”参数可以减小最大工作范围。
激光测距传感器使用激光束测量传感器与物体之间的距离。根据具体的工作范围和测量精度,测距传感器采用三角测量原理或光传播时间方法(飞行时间)测量距离。
采用三角测量原理的激光测距传感器有盲区域。因此应注意在工作范围的开始处设置开关点,以便可靠识别物体。基于光传播时间原理工作的传感器没有盲区。
wenglor 的激光测距传感器提供不同的电气接口:
- 模拟输出端
- 数字输出端
- 串行接口
- IO-Link
- 工业以太网
一般来说,测量精度取决于测量原理。如果测量值具有很高的正确度和精密度,就能达到很高的测量精度。这里规定了线性偏差和可重复性等值。例如,采用三角测量原理的传感器的线性偏差 <1 毫米。而 ToF 传感器的线性偏差 >10 毫米。
测量精度由精密度和正确度两者组成。为了获得良好的正确度,线性偏差、温度漂移、接通偏移和开关量距离偏差等数值都非常重要。
最大可重复性,也就是最大重复精度,是指在相同条件下连续测量时整个工作范围内可能出现的最大开关点偏差或测量值偏差。
线性是数据表中与正确距离的最大可能偏差。
激光三角测距传感器可以在最大 1 米的近距离内进行精确测量。飞行时间法激光测距传感器使用反射器测量时最大可达 100 米。
激光测距传感器的防护等级为 IP67/68 和 IP69K。IP67/68 防护等级的传感器具有防水性,适用于工业环境。防护等级为 IP69K 的传感器具有极强的耐抗性,能够耐抗清洗剂和高压清洗机。这种传感器适合冲洗和重型应用。
是的,设有密码功能,借此防止通过蓝牙访问。该功能从 weCon 2.1.1 版本起可用。
是的,激光测距传感器能够可靠测量深色、彩色、浅色或弱反射的任何反射系数的物体。不同表面的测量结果保持一致。
传感器的速度取决于所使用的数据输出方式。使用数字开关量输出时,开关量频率决定了每秒的最大开关量。使用模拟输出时,测量速度决定了模拟输出端每秒输出的测量数量。使用 IO-Link 接口时,最小循环时间决定了通过接口输出新测量值的速度。
激光或激光束是受激发的光子以光的形式释放能量。这个性质使光线被聚集在一起,因此激光束只有一个波长(一种颜色)。
光由不同的波长组成。每个波长都有其特定的颜色。蓝光的波长在 380 到 500 纳米之间。
一些激光测距传感器可选配不锈钢防护外壳。防护玻璃磨损后也可以更换。此外,P3 系列还有大猩猩玻璃制成的保护膜,可以像智能手机一样方便地贴在透镜盖上。
关于三角测量传感器的问题
The CMOS line is a light-sensitive receiving element. The light that falls from the object onto the line changes the position of the spot depending on the distance of the object. With the CMOS line, objects can be accurately detected even at short distances.
The temperature range is specified in the technical data. It ranges from min. –30 °C to max 60 °C. The CMOS sensors have a low temperature drift and therefore deliver consistently good measurement performance under fluctuating temperature conditions.
Yes, the measurement report can be generated individually for each sensor as a PDF for the P3 series sensors with the wTeach software. For PNBC sensors, the report is stored on the web server.
Questions About Time of Flight Sensors
The Time-of-Flight measuring principle measures the distance of objects using light pulses. The diode in the sensor emits laser pulses that are reflected by the object. The time from emission of the light pulse to the object and back is measured. The distance to the object is determined by the time and the speed of the light.
The speed of light is a fundamental constant of physics. In vacuum, it is 299,792,458 m/s.
No, ToF sensors allow up to six laser sensors to be installed directly next to each other and even opposite each other without influencing each other.
No, time-of-flight sensors are extremely resistant to disruptive ambient light (up to 100,000 lux) thanks to DS technology. This means that reliable function is guaranteed even in strong sunlight.
Yes, short-term disturbances such as raindrops can be effectively suppressed. The same applies to dust and sawdust.
Yes, ToF sensors are not only suitable for distance detection, but also for intensity and speed measurement.
DS technology stands for Dynamic Sensitivity technology. In contrast to conventional light runtime technologies, very short light pulses in the nanosecond range are emitted here, which are statistically evaluated to determine the distance value to the object.