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IR distance ranger covers 1 to 20 cm - 11-Apr-02 Issue of EDN
Commercially available IR distance rangers typically handle a 3- to 30-in.
detection distance. Many times, it is necessary to determine smaller
distances. The circuit in Figure 1 is useful for measuring small distances
to reflective surfaces. Its measurement range is from less than 1 cm to
approximately 20 cm for a flat, white surface.... [Design Idea by Paul
Florian, McKinney, TX]
