CN2588336Y

CN2588336Y - Optical imaging type level measurer

Info

Publication number: CN2588336Y
Application number: CN 02250442
Authority: CN
Inventors: 徐冲; 庄焰; 黄中伟
Original assignee: SHENZHEN NIUJITE ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SHENZHEN NIUJITE ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2002-12-17
Filing date: 2002-12-17
Publication date: 2003-11-26
Anticipated expiration: 2012-12-17

Abstract

The utility model relates to an optical imaging type level measurer which accurately measures the level height of liquid in a container. The measurer comprises a luminous element arranged along the height direction of the container, a floater arranged on the surface of the liquid in the container, a linear array CCD imaging device used as a level height sensor, an optical imaging lens arranged between the linear array CCD imaging device and the container, a CCD forwards arranged circuit unit which receives sensing signals from the linear array CCD imaging device and a video signal processing unit which receives one dimensional video signals output by the CCD forwards arranged circuit unit and processes the signals to get information about the level height. The optical imaging type level measurer has the advantages of high detection precision, realization of noncontact detection, safety and convenience, and can be widely used in a precise water level gauge, an inclinometer and a settlement measurer which are composed of liquid communicating pipes or liquid troughs.

Description

Optical imagery formula liquid surface measuring device

Technical field

The utility model relates to measuring technique, is specifically related to a kind of optical imaging concept and one dimension image processing techniques utilized, and accurately measures the device of liquid levels height in the transparent vessel.

Background technology

The accurate measurement of liquid level is the problem that people pay close attention to and study always.China's utility model 99231001 discloses a kind of liquid level detecting sensor, realizes detecting by transmitting and receiving of light emitting diode.Chinese invention patent 93103961 discloses a kind of method for detecting liquid level and device, utilizes the funtcional relationship between vibration frequency or cycle and the tested liquid level, realizes level gauging.

The utility model content

The technical problems to be solved in the utility model provides a kind of new level gauging device, has very high measuring accuracy and succinct measuring process.

The above-mentioned technical matters of the utility model solves like this, construct a kind of optical imagery formula liquid surface measuring device, comprise the light-emitting component that is provided with along the container height direction, be located at the buoy on liquid in container surface, also comprise as the alignment CCD image device of liquid surface height sensor and be located at optical imagery camera lens between described alignment CCD image device and the container, comprise that also reception is from the CDD front end circuit unit of described alignment CCD image device transducing signal and receive from a dimensional video signal of described CDD front end circuit unit output and to it and handle the video signal processing unit that draws liquid level information.

Implement the optical imagery formula liquid surface measuring device that the utility model provides, have the accuracy of detection height, can realize non-contact detection, safety is convenient.This device can be widely used in precision level, inclinator and the settlement measuring device that is made of fluid connection pipe or liquid tank.

Description of drawings

Fig. 1 is the principle schematic of the optical imagery formula liquid surface measuring device that provides of the utility model;

Fig. 2 is the planar structure synoptic diagram of the optical imagery formula liquid surface measuring device that provides of the utility model;

Fig. 3 is the side direction structural representation of the optical imagery formula liquid surface measuring device that provides of the utility model;

Fig. 4 is the logic diagram of CDD front end circuit in the optical imagery formula liquid surface measuring device that provides of the utility model;

Fig. 5 is the logic diagram of main signal treatment circuit in the optical imagery formula liquid surface measuring device that provides of the utility model.

Embodiment

The utility model utilizes alignment CCD image device, optical imagery camera lens and signal processing circuit, and the liquid levels in the transparent vessel is imaged onto the CCD device surface, by signal Processing, obtains the liquid levels height.Use alignment CCD image device as liquid surface height sensor.Use the optical imagery camera lens that the liquid levels in the transparent vessel is imaged onto alignment CCD device surface.Use signal processing circuit that the one dimension picture signal of CCD output is understood, thereby obtain the information of liquid level position.As shown in Figure 1, in the optical imagery formula liquid surface measuring device that the utility model provides, the image scioptics 3 of the liquid 2 in transparent vessel 1 and the container project the surface of alignment ccd image sensor 4.Effect by CCD front end circuit module 5, from ccd image sensor 4, obtain the vision signal 6 of each pixel illuminance of a series of representatives, pass through the processing of video processing circuit 7 again, therefrom find out illuminance and change the distance 8 of maximum pixel apart from the edge, this distance has just been represented the height of liquid level in the container.In order to make the liquid level position in the image more obvious, also used the buoy 10 in illuminating light-emitting component 9 and the liquid in the device of the present utility model.Distance in the ccd image sensor 4 between any two pixel central points is fixed, and this pixel point is apart from having determined the minimum resolving accuracy of level gauging with the optical imagery enlargement ratio.For example pixel point is apart from being 14 microns, and the imaging multiplying power is 5/1, and then the liquid level gauging resolving accuracy is 0.07 millimeter.The device of liquid levels height in this accurately measuring vessel of the present utility model, effectively utilized the geometric optical imaging principle, the liquid level of liquid projects to alignment CCD image device surface in transparent vessel with containing, by processing, accurately measure liquid level in the container to CCD device output signal.This device can be used for the precision level, inclinator and the settlement measuring device that are made of fluid connection pipe or liquid tank.

In the plane and side direction structural representation of the utility model optical imagery formula liquid surface measuring device shown in Fig. 2 and Fig. 3, light-emitting component 9 among Fig. 1 adopts the surface mounted formula red light emitting diodes 92 that is welded on the pcb board 91 herein, light emitting diode 92 tops are provided with reflector 13, and the buoy 10 among Fig. 1 is lamellules 102 of one one end bending of a rectangle polyfoam 101 following linings; CCD element 4 among Fig. 1 is herein for being welded in the common 2048 yuan of alignment CCD42 on the CCD installing plate 41; And CCD installing plate 41 uprightly is loaded on the CCD front end circuit plate 43, and CCD front end circuit plate 43 is placed on the main circuit board 11, and the transparent vessel 1 among Fig. 1 can be a fluid connection pipe 12.

Fig. 4 is the logic diagram of CDD front end circuit in the optical imagery formula liquid surface measuring device that provides of the utility model; CCD front end circuit 5 comprises clock-signal generator, difference video signal amplifier and signal transformation circuit, wherein, clock generator 51 produces the required clock signal of CCD, the signal of 52 pairs of CCD outputs of differential amplifier amplifies, and signal transformation circuit 53 is organized into the binaryzation digital signal with vision signal.

Fig. 5 is the logic diagram of main signal treatment circuit in the optical imagery formula liquid surface measuring device that provides of the utility model.Main signal treatment circuit 7 comprises impulse meter 71, CPU72 and communication interface circuit 73, wherein impulse meter 71 is counted automatically and is occurred buoy signal time clock number before in each scan period, CPU72 converts pulse number to position dimension by computed in software, by external communication interface 73 result is sent at last.

Claims

1, a kind of optical imagery formula liquid surface measuring device, it is characterized in that, comprise the light-emitting component (9) that is provided with along the container height direction, be located at the buoy (10) on the interior liquid of container (1) (2) surface, also comprise as the alignment CCD image device (4) of liquid surface height sensor and be located at described alignment CCD image device (4) and container (1) between optical imagery camera lens (3), comprise that also reception is from the CDD front end circuit unit (5) of described alignment CCD image device (4) transducing signal and receive from a dimensional video signal of described CDD front end circuit unit (5) output and to it and handle the video signal processing unit (7) that draws liquid level information.

2, according to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that described video signal processing unit (7) comprises the impulse meter (71) of receive clock pulse, synchronizing pulse and vision signal, the CPU element (72) that is connected with impulse meter and the communication unit (73) that is connected with CPU element (72).

3, according to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that described CDD front end circuit unit (5) comprises to be provided clock and synchronizing pulse and the clock generator (51) that is connected with CDD image device (4), the difference amplifying unit (52) that is connected with CDD image device (4) output port and be connected the signal reshape unit (53) that vision signal output is provided with difference amplifying unit (52).

According to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that 4, described light-emitting component (9) adopts the red light emitting diodes of surface-adhered type, described light emitting diode is welded on the printed circuit board (PCB).

According to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that 5, described buoy (10) comprises a rectangle polyfoam (101), and lining is at the lamellule (102) of one one end bending of this foam-plastic blocks (101) bottom.

According to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that 6, described CCD image device (4) is mounted in the common 2048 yuan of alignment CCD devices on the CDD installing plate, described CDD installing plate uprightly is loaded on the CDD front end circuit plate.

7, according to the described optical imagery formula of claim 1 liquid surface measuring device, it is characterized in that, also comprise the reflector (13) that the light that light-emitting component produces can be transmitted into the buoy direction.