Method and circuit arrangement for measuring the flow velocity by means of acoustic transit time differences
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Distance measuring method and device
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Method and device for determining the light propagation time over a measuring section arranged between a measuring device and a reflecting object
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Spectral analyser of gas concentration
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Sampling and measuring system for determining the dust content in an exhaust duct
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Operating safety beam gate with light transmitters arranged close in row
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Diffuse sensors with background suppression, implemented using the quotient method
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Reflection light barrier for identifying objects within range covered by beam
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Optical sensor arrangement for presence detection with variable pulse repetition frequency
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Method and device for checking the state of charge of a transport or storage medium
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Laser range finding apparatus
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Barcode reader and method for its operation
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Method and scanning arrangement for identifying a code consisting of successive light and dark fields
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Method for determining the propagation time (delay time) of sound signals, and a sound-wave propagation-time determining device
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Method and arrangement for the angular adjustment of a line scanning device
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Methods and devices for determining objects present in a surveillance area and / or for determining their position
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EM wave, esp. light, transition time measuring appts. - transmits light pulses over measurement path to receiver, has pulse generator and light modulator in feedback path.
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Safety switch arrangement
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Comparator circuit e.g. for optical detector which signals presence of object - uses two comparators to provide two different outputs when input rises above or drops below switch threshold
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Optical sensor arrangement and method for its operation
