Photoelectric movement detector with varying amplitude light source

US4458146A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Reiner · Neubiberg, DE
• Eckart Schatter · Zorneding, DE

Key dates

• Filing date: May 4, 1981
• Grant date: Jul 3, 1984
• Expiry date: May 4, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V8/12
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Device for determining movements with light, including a light transmitter for radiating light pulses with steeply rising and slowly falling flanks, and a light receiver for the light pulses radiated by the light transmitter, the light receiver including an evaluation threshold device for measuring the duration of individual light pulses, for storing the pulses and for comparing the pulses with each other.