CN2505834Y

CN2505834Y - Circular hole mechanism of tubular turbidity sensor

Info

Publication number: CN2505834Y
Application number: CN 00216679
Authority: CN
Inventors: 杨汝清
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2000-03-02
Filing date: 2000-03-02
Publication date: 2002-08-14
Anticipated expiration: 2010-03-02

Abstract

The utility model mainly comprises a light source, a sampling tube, an optical receiver, a small circular hole, wherein, the diameter of the end part of the sampling tube is provided with a pair of small circular holes, an optical path of the light source is received by the optical receiver via the small circular holes on the sampling tube.

Description

Duct type mixes erosion degree sensor circular hole mechanism

The utility model relates to a kind of duct type and mix erosion degree sensor circular hole mechanism.Belong to the sensor field in the physics class.

The turbidity of liquid is meant the degree that contains other impurity in the liquid, because directly miscellaneous impurity is relatively more difficult in the measurement liquid, so all adopting optical principle at present in the world measures indirectly, and the method for testing and the test specification of turbidity have been formed with this, from test philosophy, the tube wall of this pipeline should be transparent, should be transparent at least on light path.The turbidity measurement has the sampling type of interruption to measure and continuous on-line is measured.These two kinds of measurements all have a common problem, and promptly the impurity in the liquid makes the transparent decline of tube wall along with the growth of time can more and more stick on the transparent measurement tube wall, measure inaccurate even can't measure and cause.In the practice, such phenomenon is referred to as " wall built-up ".Because wall cling phenomenon can influence the operate as normal of sensor, particularly shows even more seriously when on-line continuous is measured, the wall built-up problem that therefore solves in the measuring process has just become one of key issue of duct type turbidity detection.Through retrieval, find mainly to take on the present engineering following two kinds of methods to reduce and avoid the influence of wall cling phenomenon to prior art.

1, often demarcates and adjust sensor again, make it keep necessary accuracy.In case wall built-up seriously to a certain degree, is demarcated again or is adjusted in the time of can not solving, and can only clean or change again sensor to tube wall.

2, adopt special design, often clean tube wall.Such as, the piston that motor drives is housed in the sampling pipe, utilize piston inspiration fluid to be measured, and piston handle in evening liquid is cleaned tube wall when discharging in passing.See for details: Harry Norton.Sensor and Analyzer Handbook prentice Halllnc.1982.

In fact first method does not solve the wall built-up problem, just tackles use.If this method is a trouble and bothersome to sampling type, be worthless so basically concerning the on-line continuous formula.

Second method often will be keeped in repair owing to its complex structure, cost height, and actual Use Limitation fruit is not good.

The technical solution of the utility model is as follows: mainly comprise light source, sampling pipe, optical receiver and small sircle hole, diameter is opened a pair of small sircle hole in the end of sampling pipe, is passed small sircle hole and has been avoided tube wall by the light path that light source and optical receiver are formed.Because this exists still having most tube walls around the small sircle hole, so flow of liquid is still more stable through herein the time, certainly, because to small sircle hole, the pipe external and internal pressure is different through this for flow of liquid, from then on some air can enter fluid to small sircle hole, near the liquid level of small sircle hole is fluctuateed, slightly influential to output signal, but handle by signal processing method commonly used, sensor can be used for the usable range that medium accuracy requires fully reliably.

The utlity model has practical value, overcome defective of the prior art,, sensor is operated in stably in a long term have the usable range that medium accuracy requires owing on the light path of measuring, eliminated the tube wall phenomenon.

Further describe below with reference to accompanying drawing:

Fig. 1 the utility model structural representation

As shown in Figure 1, the utility model mainly comprises light source 1, sampling pipe 2, optical receiver 3 and small sircle hole 4, opens a pair of small sircle hole 4 on the diameter of the end of sampling pipe 2, and the small sircle hole 4 of the light path of light source 1 on sampling pipe 2 received by optical receiver 3.Because eliminated the tube wall phenomenon on the light path of measuring, sensor can be used for the medium accuracy claimed range fully stably in a long term.

Claims

1, a kind of duct type mixes erosion degree sensor circular hole mechanism, mainly comprise light source (1), sampling pipe (2), optical receiver (3), it is characterized in that also comprising small sircle hole (4), on the end diameter of sampling pipe (2), open a pair of small sircle hole (4), the small sircle hole (4) of the light path of light source (1) on sampling pipe (2) received by optical receiver (3).