Digital gas flow sensor

Abstract

The invention discloses a digital gas flow sensor comprises a circuit system, a laser source, a glass rotameter, fiber image bundles and photodiode arrays. The circuit system structurally comprises a microprocessor, a driver circuit, a signal processing circuit and a photodiode scanning circuit. The fiber image bundles are arranged in the axial direction of a glass tube to form a plurality of columns, a cylindrical lens is arranged between the glass tube and the fiber image bundles, the heads and tails of the columns are flush, and each column is formed through a plurality of vertical-arrayed fibers. Each column of the fibers corresponds to a group of the photodiode arrays, each photodiode array is formed through a plurality of photodiodes, and the fibers are connected to the photodiodes. The digital gas flow sensor has the advantages that digital signals are outputted, anti-jamming capability is high, resolution is high, performances are stable and reliable, structure is simple, and cost is low.

Description

technical field [0001] The invention relates to a digital gas flow sensor. Background technique [0002] Sensor technology has always been a popular technology, among which gas flow sensors are widely used in industrial production, chemical industry, environmental monitoring, biochemical technology and scientific experiments. Among the traditional gas flowmeters, the glass rotameter is a common category. Although the flowmeter is simple in structure and easy to use, it can only meet the needs of on-site instant measurement, and cannot realize the recording and automatic control of the flow rate. In some existing rotor-type flow sensors, the conversion of physical quantities is mostly carried out in the form of analog quantity conversion (such as differential transformers), and its output is analog quantity, and the sampling signal only has quantitative changes (continuous) without qualitative Change (mutant), it is difficult to resist external interference, internal drift, ...

AI Technical Summary

Problems solved by technology

Among the traditional gas flowmeters, the glass rotameter is a common category. Although the flowmeter has a simple structure and is easy to use, it can only meet the needs of on-site instant measurement, and cannot realize the recording and automatic control of the flow rate.

In some existing rotor-type flow sensors, the conversion of physical quantities is mostly carried out in the form of analog quantity conversion (such as differential transformers), and its output is analog quantity, and the sampling signal only has quantitative changes (continuous) without qualitative Change (mutant), it is difficult to resist external interference, internal drift, stability and reliability are difficult to meet the requirements of use

Images