Accurate distance measurement device and method based on capacitor discharge voltage time difference
A capacitor discharge and distance measurement technology, which is applied in the field of accurate distance measurement devices based on capacitor discharge voltage time difference, can solve problems such as inability to perform accurate measurement, and achieve the effect of accurate calculation
Inactive Publication Date: 2014-08-06
唐克良
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[0005] like figure 1 As shown, the influence of different reflective surfaces on the measurement results of pyroelectric sensors: the accuracy of the test distance results of the white card can reach 90%, while the accuracy of the black card can only reach 5%, which also cannot be accurately measured
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0034] figure 2 It is a schematic diagram of a device for accurately measuring distance based on time difference of capacitor discharge voltage.
[0035] Such as figure 2 As shown, the device for accurately measuring distance based on the capacitor discharge voltage time difference includes a capacitor C charging and discharging circuit, a voltage test circuit not shown in the figure, an IR transmitter, an IR receiver, a controller and a calculator not shown in the figure.
[0036] The capacitor charging and discharging circuit includes: a capacitor C connected in series, a capacitor discharging resistor R, a first switch K1 and a second switch K2.
[0037] The voltage test circuit is used for the voltage value across the capacitor C. When the capacitor C is charged, the voltage test circuit obtains the initial voltage V1 of the capacitor ...
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The invention provides an accurate distance measurement device based on the capacitor discharge voltage time difference. When a capacitor C is charged, a voltage test circuit obtains an initial voltage V1 of the capacitor C; a controller controls a transmitter to transmit infrared light, and controls the capacitor C to discharge at the same time; when a receiver receives the returned infrared light, the controller controls the capacitor C to stop discharging, and a turn-off voltage V2 of the capacitor C is obtained; a calculator carries out calculation to obtain the distance. The accurate distance measurement device and method based on the capacitor discharge voltage time difference have the advantages that the voltage difference obtained after the capacitor discharges within extremely short time is used for calculating the transmission time of the infrared light so that accurate measurement of the calculated distance can be achieved; the device and method are applied to accurate measurement of the distance between a human body and a device when a user reads a book or watches a screen.
Description
technical field [0001] The invention relates to a device and method for measuring distance, in particular to a device and method for accurately measuring distance based on time difference of capacitor discharge voltage. Background technique [0002] The method of measuring the precise distance by infrared reflection time is mainly to emit infrared rays directionally through the infrared emitting device, and convert the time difference into a distance measurement value by calculating the time difference between the infrared emission time and the infrared reflection and receiving time. The accuracy of infrared measurement distance is mainly affected by two aspects of propagation medium and reflection medium. Among them, the time delay caused by the reflective medium will cause the error of the distance measurement result to several meters or even tens of meters, which is the main factor affecting the distance measurement. At present, most of the methods for calculating distan...
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IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 刘达唐克良胡舟燕
Owner 唐克良