Electronic levelling instrument

Abstract

An electronic level consists of a capacitive sensor and a measurement processor circuit. A sensor measuring circuit, an A / D conversion circuit, CPU and a LCD display are connected in series in the measurement processor circuit. A capacitance / frequency conversion circuit, the CPU and the LCD display are connected in series. The invention possesses the features as follows. (1) Capacitance is used as the sensor for measuring level, providing the high measuring accuracy with simple structure. (2) The measurement processor circuit with simple structure of the circuit is adopted, providing high sensitivity with cheap component. (3) The entire structure is simple so that the products are easy to be manufactured. The electronic level can be utilized in large-scale or precise engineering.

Description

technical field [0001] The invention belongs to the category of measurement, and in particular relates to a level sensor and a level. Background technique [0002] The spirit level is a kind of measuring instrument for measuring the level. It is widely used in large-scale projects or precision projects such as buildings, rocket launch platforms, and bridges. At present, the commonly used sensor in the spirit level is a water bubble sensor. Chinese patent application No. 86202257 discloses an electronic level, but the precision of this level is low. In order to improve the measurement accuracy, some electronic levels use whether the pendulum vertical line is in contact with two horizontal bodies to measure the level or verticality. For example, Chinese patent application No. 89206956.2 discloses an electronic level. This level is only tilted to a certain level. It will give a music alarm signal when the level is high, and it cannot be used for pr...

AI Technical Summary

Problems solved by technology

Chinese patent application No. 86202257 discloses an electronic level, but the precision of this level is low

In order to improve the measurement accuracy, some electronic levels use whether the pendulum vertical line is in contact with two horizontal bodies to measure the level or verticality. For example, Chinese patent application No. 89206956.2 discloses an electronic level. This level is only tilted to a certain level. Gives a music alarm signal when the level is low, and cannot be used for precision measurement

At present, capacitive sensors are used in most engineering measurements, such as the ADXL50 acceleration sensor produced by Analog Device Inc. in the United States. This sensor integrates the sensor and signal conditioning circuit on one chip, which is small in size, resistant to shock, and easy to use. ; But the sensitivity of the electronic level meter composed of this kind of sensor is often low, which cannot meet the needs of high-precision measurement level

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