611 block circuit diagram of an optical proximity

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: status display (7) Photoelectric emitter (2) Output stage with protective circuit (8) Photoelectric receiver (3) External voltage (9) Preamplifier (4) Internal constant voltage supply (10) Logic operation (5) Optical switching distance (11) Pulse/level converter (6) Switch output (12) Fig. 6.1.1: Block circuit diagram of an optical proximity sensor (Emitter and receiver are installed in the same housing) © Festo Didactic GmbH & Co. KG • FP 1110 71 6. Optical proximity sensors Emitter 6.1.1 Emitter and receiver elements in optical proximity sensors For versions without fibre-optic connection: • GaAIAs – IRED • Wavelength 880 nm (non visible, infrared) For versions with fibre-optic connection: • GaAIAs – IRED • Wavelength 660 nm (visible, red) Receiver Silicon-phototransistor (Versions with in series connected daylight filters are used for proximity sensors operating at 880 nm.) Optical proximity sensors usually have already built-in protective measures: – Reverse polarity protection – Short-...
View Full Document

This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

Ask a homework question - tutors are online