Paper currency detection method and equipment and self-adaptive regulating method and device for photoelectric sensor

Abstract

The invention provides a self-adaptive regulating method and device for a photoelectric sensor. The self-adaptive regulating method can regulate the DAC (Digital-to-Analog Converter) quantitative value corresponding to the voltage at the luminous end of a self-adaptive regulating method and compensate the DAC value, so that the influences on the photoelectric sensor from structural deflection, surface soot formation and other factors are reduced, and the self-adaptation of the photoelectric sensor is enhanced. The self-adaptive regulating method and device are used in the paper currency detection equipment and method to lower the failure rate of the paper currency detection equipment. The invention further provides paper currency detection equipment and a paper currency detection method.

Description

technical field [0001] The invention relates to a banknote detection method and device in a financial self-service device, in particular to an adaptive adjustment method and device for a DAC value corresponding to a light-emitting terminal voltage of a photoelectric sensor in the banknote detection device. Background technique [0002] In order to detect the existence of banknotes in the conveying channel, calculate the width of a single banknote and detect whether banknotes overlap in the cash automatic teller machine, it is usually detected by arranging multiple groups of photoelectric sensors in the conveying channel. However, when the equipment is frequently used in some places, dirt and dust are likely to affect this type of sensor, which greatly reduces the actual light intensity received by the receiving end, so the sensor has poor adaptability to the environment. The current solution is generally: use a linear photoelectric sensor, set its light-emitting end to a fix...

AI Technical Summary

Problems solved by technology

Because this method uses the light-emitting terminal to fix the working current value, it has the disadvantages of limited adjustment range, slow scanning speed when there are many channels, and low circuit integration.

[0003] In order to solve the above problems, some automatic teller machine cores use digital photoelectric sensors, and set a fixed working current value with a certain margin at the light-emitting end. The digital signal output by the receiving end is processed by a shaping isolation circuit and then introduced to the central The GPIO port of the processing unit simplifies the circuit, but there are certain restrictions in this usage. Although the working current value set at the light-emitting end of the photoelectric sensor has a certain amount of margin, it will still be affected by the dirt and dust on the surface of the sensor and the channel to a certain extent. , sensor installation structure offset, sensor light aging and other factors, resulting in the receiving end of the sensor can not receive enough light intensity when the conveying channel is not blocked by paper, resulting in abnormal detection, which indirectly reduces the photoelectric sensor. service life

When the automatic teller machine is used on a large scale, the frequent shutdown of the machine, the replacement of the sensor and the cleaning of dust will affect the use of the machine to a certain extent

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