CN103940481A

CN103940481A - Laser micro-flow detection device

Info

Publication number: CN103940481A
Application number: CN201410204082.1A
Authority: CN
Inventors: 胡达广
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-05-14
Filing date: 2014-05-14
Publication date: 2014-07-23

Abstract

The invention provides a laser micro-flow detection device, belongs to the field of micro-flow detection technologies and aims at detecting outlet liquid micro-flows on the premise that monitored liquid does not directly flow through a flow metering device. The laser micro-flow detection device takes a following measure: laser transmitting tubes (5) and laser receiving heads (6) are respectively installed on two sides of a transparent drip tube (4), the laser transmitting tubes (5) are connected with a laser signal generator, the laser receiving heads (6) are connected with a laser signal processing circuit, the laser signal processing circuit is connected with a single chip microcomputer, and the single chip microcomputer is connected with a display screen (3). The laser signal processing circuit is a circuit device capable of converting electrical signals output by the laser receiving heads when water flows through the transparent drip tube into electrical signals which can be recognized by the single chip microcomputer. The laser micro-flow detection device has the advantages that due to the fact that liquid dripping information is read by adopting a laser technology, detected liquid is non-contact when liquid flows are detected. Liquid corrosion on an instrument is avoided.

Description

Laser micrometeor pick-up unit

Technical field

The invention belongs to a field of micrometeor detection technique.

background technology

A lot of technical fields in industry automatic control, medical treatment, laboratory etc., all need the liquid of micrometeor carry out flow detection and and control.But owing to being micrometeor, so its flow velocity flow very slow, the unit interval is considerably less, its mobilization force is not even enough to promote apparatus working.So the conventional means of existing use almost cannot detect exactly and measure.At some special occasions, for example field of medical technology, need to detect metering to the liquid body of micrometeor, to control manually or automatically accurately., the flowmeter using in the prior art not only cannot measure the micrometeor of liquid, and they all need the measured liquid flowmeter of flowing through.This is unallowed to pharmaceutical drugs, because be easy to like this cause the pollution of liquid.Therefore, in the prior art, field of medical technology all can not find suitable micrometeor pick-up unit up till now.

On the other hand, in industry, the occasion such as technical field, laboratory that particularly chemical industry etc. need to be controlled automatically according to micrometeor, a lot of local liquid that all needs to detect the micrometeor with severe corrosive, as automatic control or record the foundation of flow.These liquid are general, and all with very strong corrosion or hypertoxicity, they also can precipitate and crystallization, and it can badly damaged flowmeter.General flowmeter is difficult to it to measure.Cause this to remain on the one hand a blank.

Summary of the invention

For can be under monitored liquid not directly be flowed through the prerequisite of flow measurement device, detect the micrometeor of liquid, the present invention has taked following measure: on the both sides of transparent drop cylinder, LASER Discharge Tube and laser pick-off head are installed respectively, LASER Discharge Tube connects laser signal generator, laser pick-off head connects laser signal treatment circuit, laser signal treatment circuit connects single-chip microcomputer, and single-chip microcomputer connects display screen; Laser signal treatment circuit described here refers to can be by laser pick-off head output, and the electric signal that water droplet produces while flowing through transparent drop cylinder changes the circuit arrangement of the electric signal that single-chip microcomputer can identify into.

The benefit of doing is like this: laser micrometeor pick-up unit of the present invention, and owing to having adopted laser technology " to read " fluid drips stream information, so in the time of tracer liquid flow, be non-contacting to detected liquid.That is to say, liquid is at direct contact measurement device, still can remain in the situation of circulation in oneself pipeline, and the present invention also can measure its micrometeor.So just can avoid measurement mechanism to bring secondary pollution to detected liquid, also avoid the corrosion of corrosive liquids to instrument simultaneously.This dress can pass through single-chip microcomputer, can add up monitoring to the flow of unit interval and total flow at any time, makes user can understand in time the situation of change of flow.So such device is great especially to the use meaning of medical field.

Brief description of the drawings

Fig. 1 is the structural representation of laser micrometeor pick-up unit.

Fig. 2 is the electrical block diagram of laser micrometeor pick-up unit.

In figure: flow regulator 1, drop sebific duct 2, display screen 3, transparent drop cylinder 4, LASER Discharge Tube 5, laser pick-off 6.

Embodiment

The present invention is on the both sides of transparent drop cylinder 4, and LASER Discharge Tube 5 and laser pick-off 6 has been installed respectively.LASER Discharge Tube sees through transparent drop cylinder 4, to a laser pick-off 6 Emission Lasers pulse signal.In the time that the top of transparent drop cylinder 4 has liquid downwards drip and pass through the transmission path of laser, laser beam is by drop scattering and stop.Having there is variation in the laser signal intensity that at this moment laser head obtains, causes that variation has also occurred the electric signal of laser pick-off head output, and these variations can reflect flowing through of drop exactly.

A laser pick-off 6 connection laser signal treatment circuit.Laser signal treatment circuit described in the application refers to can be by laser pick-off head output, and the electric signal that water droplet produces while flowing through transparent drop cylinder changes the circuit arrangement of the pulse electrical signal that single-chip microcomputer can identify into.The present invention does not have special requirement to laser signal treatment circuit, and the form of laser signal treatment circuit is to have diversifiedly, and they can have different structures and different combinations.

Principle of work of the present invention for convenience of description, the present embodiment is beaten garter as example taking medical field.First upper medicine bottle hanging hook, then connect stilligout sebific duct 2, more transparent drop cylinder 4 is clipped between LASER Discharge Tube 5 and laser pick-off 6, as shown in Figure 1.Air in nurse releases drop sebific duct 2 is also connected to syringe needle after patient's vein blood vessel, just can open flow regulator 1, below at this moment liquid starts to drip above transparent drop cylinder 4.The power switch of opening laser micrometeor pick-up unit, circuit is started working.LASER Discharge Tube 5 is to a laser pick-off 6 Emission Lasers pulse.While falling in the time that liquid water droplet drips above transparent drop cylinder 4, water droplet has flow through the transmission path of laser, when Ear Mucosa Treated by He Ne Laser Irradiation has caused sharp scattering of light and refraction to time on water droplet.It makes the laser that originally arrives laser pick-off head that deflection occur, and its energy significantly reduces.There is variation in the electric signal that reduces laser pick-off head is exported of laser energy.These variations can reflect flowing through of drop truely and accurately.Laser pick-off head connects laser signal treatment circuit, and laser signal treatment circuit connects single-chip microcomputer, as shown in Figure 2.Laser signal treatment circuit changes monolithic function identification into the electric signal of laser pick-off head output, is sent to single-chip microcomputer after having represented the pulse electrical signal that water droplet flows through.Single-chip microcomputer is pressed blas, according to the time between two drops, calculates dripping number and showing the reference frame as adjust flux regulator 1 for nurse by display screen of per minute.So greatly shortened adjust flux time, alleviated nurse's labour intensity.Single-chip microcomputer can arrange alert program on the other hand.For example, in the time that the regular hour does not detect flow, can think that the blocked or liquid medicine of sebific duct pressurized beaten, single-chip microcomputer can start alert program at once and report to the police and transfer to nurse to process.In the time that flow is greater than setting value, single-chip microcomputer can start equally alert program warning and transfer to equally nurse to process.

Claims

1. laser micrometeor pick-up unit, mainly comprise LASER Discharge Tube (5), laser pick-off head (6), display screen (3) composition, it is characterized in that: LASER Discharge Tube (5) and laser pick-off head (6) are installed respectively on the both sides of transparent drop cylinder (4), LASER Discharge Tube (5) connects laser signal generator, laser pick-off head (6) connects laser signal treatment circuit, laser signal treatment circuit connects single-chip microcomputer, and single-chip microcomputer connects display screen (3); Laser signal treatment circuit described here refers to can be by laser pick-off head output, and the electric signal that water droplet produces while flowing through transparent drop cylinder changes the circuit arrangement of the electric signal that single-chip microcomputer can identify into.