测距仪

为什么带通滤光片至关重要

在激光测距仪中，探测器接收到的光是目标反射的激光信号和不需要的背景辐射（如阳光）的组合。

  • 降噪：阳光包含大量的光谱辐射，尤其是在近红外区域。带通滤光片 (BPF) 起到高选择性闸门的作用，允许信号（在激光波长处呈现强而窄的脉冲）通过，同时衰减宽光谱噪声，这对于精确测距至关重要，尤其是在远距离或明亮的户外环境下。
  • 提高灵敏度：通过减少照射到探测器上的总背景光，该滤光片降低了整体噪声基底（例如散粒噪声），从而有效地提高了探测器对微弱反射激光脉冲的灵敏度。
Diagram showing a laser rangefinder receiver using a bandpass filter to pass the reflected laser signal while reducing unwanted sunlight and ambient background before the detector.
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中心波长（nm）
半高宽 (纳米)
光密度（OD）

筛选条件

中心波长（nm）
半高宽 (纳米)
光密度（OD）
Before-and-after diagram showing how a bandpass filter reduces sunlight and ambient background so a rangefinder detector receives a clearer return signal.

Reduces sunlight and background light

Outdoor rangefinders receive a lot of unwanted light:

  • sunlight
  • sky background
  • reflections from surroundings
  • LED / lamp background
  • thermal or broadband background

A bandpass filter blocks much of this out-of-band light before it reaches the detector.

This helps improve:

  • signal-to-background ratio
  • detection stability
  • measurement reliability
  • maximum useful range

Match the Filter to the Rangefinder Laser Wavelength

Select the bandpass filter center wavelength to match the rangefinder laser source.

850nm → BP850
905nm → BP905
940nm → BP940
1064nm → BP1064
1550nm → BP1550

Diagram showing rangefinder laser wavelengths matched to corresponding bandpass filters, including 850nm, 905nm, 940nm, 1064nm, and 1550nm options.
Infographic showing how a 3–10nm narrow bandpass filter with OD4+ blocking passes the laser return wavelength while reducing out-of-band background for a cleaner receiver signal.

Narrow Bandwidth and High Blocking for Receiver Filtering

  • 3–10nm bandwidth helps isolate the return signal
  • OD4+ blocking reduces unwanted background light
  • Cleaner receiver signal improves detection stability