INFRARED RADAR FOR PEOPLE WITH WEAK SIGHT Russian patent published in 2009 - IPC G01S17/02 A61H3/06 A61F9/08 

FIELD: instrument engineering.

SUBSTANCE: invention refers to devices used for warning a person with weak sight against approaching an obstacle, and for assessing the distance thereto. Into infrared radar for people with weak sight there additionally introduced is a switch, the first memory register, in-series connected the second memory register, the second digital-to-analogue converter, the second controllable audio frequency generator and the second headphone, and pulse counter is made in the form of reversible pulse counter. Frequency divider output is simultaneously connected to input of T-type flip-flop, control input of reversible pulse counter and control input of switch. True output of T-type flip-flop is connected to input of left-handed infrared source, and inverted output of T-type flip-flop is connected to input of right-handed infrared source. Output of pulse generator is parallel connected to frequency divider input, inverting input of reversible pulse counter to controllable input of linear instrument with charge coupling. Output of limiting amplifier is connected via the switch to control input of the first memory register and control input of the second memory register. Output of reversible pulse counter is connected simultaneously to data inputs of the first and the second memory registers. Output of the first memory register is connected to the first digital-to-analogue converter connected via the first controllable frequency generator to the first headphone.

EFFECT: improving accuracy of determining location of obstacle relative to movement trajectory of a person with weak sight.

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