Ultrasonic statural height measuring device

Abstract

A ultrasonic instrument for measuring the height of human body is composed of casing, ultrasonic emitter, ultrasonic receiver, display and the circuit unit consisting of signal emitting circuit (pulse power amplifier), signal receiving circuit consisting of pulse amplifier and level converter, signal processing circuit (single-chip microprocessor), display circuit consisting of driver and decoder, and power supply circuit.

Description

technical field [0001] The invention relates to a distance measuring instrument, in particular to a portable measuring instrument for measuring human body height and short distance. Background technique [0002] At present, the ultrasonic height gauges in the market are basically designed as electronic display weighing scale desktop height gauges. The cost is high, the structure is complex, the volume is large and heavy, and it needs to occupy a certain space. [0003] For example, the Chinese patent document whose patent number is 88211628 and application number is 88105505 discloses a non-contact measuring device for human body height, including a main vibration unit, a transmitting unit, a receiving unit, a distance-gain automatic control unit, and an initial monostable oscillation Devices, working memory units, reference monostable oscillators, height comparators, clock pulse generators, counters, registers, decoders, LCD drivers, digital displays and power supplies, etc...

AI Technical Summary

Problems solved by technology

However, this device is similar to the above device, and it is also designed as a bench-type ultrasonic height wave measuring instrument for weighing scales. When measuring height, first adjust the ultrasonic transmitting part and receiving part, then start the measurement, and then compare the reflection time of the whole body and the reflection time from the top of the human head. , and then calculate the human body height reading, the device is bulky, takes up a lot of space, and the cost is high, so it is not suitable for home use; the purpose is single, limited to measuring height, it is inconvenient to carry, and obviously cannot keep up with the needs of the modern market

[0005] The measurement principle of the existing ultrasonic height meter and similar products is non-contact measurement. The measurement involves the coordinated processing of two channels of incoming and outgoing ultrasonic waves. The structure of the circuit is complicated. It cannot meet the high requirements of modern people's portability and simplicity, and the cost is high, so that similar instruments for ultrasonic height measurement cannot meet the needs of daily life and fail to enter thousands of households

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