Diffuse reflection sensors are applied to detect presence, error proof, fill level and height of the targets. When a red, infrared or laser light source is cast on the surface of the targets, it is diffused in many directions. A small portion of the light is reflected back to the sensors' receiver, which is sensitive to weaker reflected light. Thus electric signals are activated for output.
Sensing ranges, varying from a maximum of 50 mm to 200 cm, depend on the targets' reflectivity. The diffuse reflection mode photoelectric sensing include proximity, fixed focus, convergent beam, divergent beam, wide angle, background and foreground suppression.
One of the advantages of the diffuse reflection or proximity style photoelectric sensors is that the light emitter (light source) and the receiver are in the same enclosure. Thus a single device for mounting and wire makes installation easier and faster. This is a huge benefit in restrictive space where both sides of the target are unavailable. Due to only one device in use, such sensors are more effective in cost, compared with retro-reflective or through-beam sensors.
Features of Landz diffuse reflection sensors
▪ Performance more steady due to specialized IC;
▪ Reverse polarity, short-circuit and surge protection;
▪ Housing materials: nickel-copper alloy or economic plastic types;
▪ Protection degree: IP67 (IEC).