CN202133430U - Three-dimensional laser scan based large volume measurement equipment with high precision - Google Patents

Abstract

The utility model discloses a three-dimensional laser scan based large volume measurement equipment with high precision. A data acquisition card of the equipment is electrically connected with a laser scanner, temperature sensors and a PC respectively, and the measurement equipment further comprises a content gage electrically connected with the data acquisition card and one or more pressure transmitters electrically connected with the data acquisition card respectively. The measurement equipment acquires point cloud data on the surface of a container through the three-dimensional laser scanner, and obtains the volume of the container accordingly; and the temperature of the to-be-measured container is obtained through the auxiliary temperature sensors, and the influence on the measurement result of the volume caused by the temperature distribution of the container is modified through carrying out the temperature compensation to the measured result on the volume. On a container with liquid, the influence on the measurement result of the container caused by the liquid pressure is modified through measuring the pressure condition of the liquid by the content gage or the pressure transmitters. The measurement equipment provided by the utility model can achieve quick measurement to containers with large volume such as oilcan and the like, and due to the measurement precision, the measurement equipment can be further applicable to measurement verification and calibration.

Description

The big volumetric measurement device of high precision based on 3 D laser scanning

Technical field

The utility model relates to the pressure compensated big volumetric measurement device of a kind of high-precision temperature, especially can examine and determine the metering and calibrating device of oil tank volume.

Background technology

At present; The measurement verification of large-volume receptacle all is to adopt the girth of artificial steel tape measuring vessel at the differing heights place; Carry out match with regular figure as the match target; The calculating container section is long-pending, to container in the short transverse segmentation, with height of lift and sectional area multiply each other obtain the segmentation volume after addition obtain container volume.But this method is owing to need artificially in work high above the ground, therefore strict to measuring condition, and measurement result adopts regular figure to carry out match, brought bigger error, is unfavorable for carrying out of measurement verification.In recent years, people have also worked out the method that adopts the total station survey large-volume receptacle, but total powerstation can only use in container; Container external pelivimetry accuracy sharply descends; Therefore energy measurement just after need emptying container, and total powerstation adopts the mode of simple scan, and Measuring Time is long; Therefore very high to the stability requirement of environment, its measuring accuracy and the stable requirement that does not often reach measurement verification.

The utility model content

The purpose of the utility model provides the big volumetric measurement device of a kind of high precision based on 3 D laser scanning.

For realizing above-mentioned purpose, the technical scheme that the utility model is taked is following:

The utility model comprises laser scanner, above temperature sensor, data collecting card and a PC based on the big volumetric measurement device of high precision of 3 D laser scanning, and said data collecting card is electrically connected with said laser scanner, each temperature sensor and PC respectively.

Further, the above-mentioned measurement mechanism of the utility model also comprises liquid level gauge that is electrically connected with said data collecting card or the pressure unit that is electrically connected with said data collecting card respectively more than one.

The beneficial effect of the utility model is: the bulk container volume of all temps such as high temperature or low temperature can be measured owing to adopt laser non-contact measuring mode and temperature compensation in (1).(2), therefore can measure band liquid or not with the vessel volume of liquid because can be in container or container external pelivimetry and pressure compensation.(3) because laser scanner measurement has obtained a large amount of spatial datas, therefore need not to suppose the geometric configuration of container, can measure geometrical rule or irregular container situation vessel volume.(4) the utlity model has the function of automatic measurement, can realize measuring volume quickly and easily.Show that according to experimental measurements the uncertainty of measurement of this device obtains the measurement result that precision satisfies the metering demand less than 0.05%.(5) the utility model has overcome the shortcoming that error is big, environmental requirement is high that manual method measurement verification large-volume receptacle brings in the prior art, has eliminated the deficiency that total powerstation method measurement stability is poor, need slack tank to measure.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified:

Fig. 1 is the structural representation of first kind of measurement mechanism of the utility model;

Fig. 2 is the structural representation of second kind of measurement mechanism of the utility model;

Fig. 3 is a container longitudinal cross-section analyzing spot angle synoptic diagram;

Fig. 4 is the utility model scanning movement point selection synoptic diagram (overlooking).

Embodiment

The utility model adopts 3 D laser scanning as the main measurement means of measuring big volume, utilize three-dimensional laser scanner fast, big data quantity and non-contacting metering system, obtain the spatial data of big volume.Spatial data is carried out after noise removing handles; Calculate the bulk container volume under the actual measurement situation; After the surface temperature of the container that utilizes temperature sensor again and obtained the volume that measures is carried out the temperature correction, to revise since vessel temp distribute to volumetric measurement result's influence.If in the target bulk container liquid is arranged, also need obtain the pressure data in the target bulk container through pressure unit or liquid level gauge, measurement result is done further pressure correction.Thus, finally realized the volumetric measurement of bulk container.Show that according to experimental measurements the uncertainty of measurement of the utility model device can satisfy the demand of measurement verification fully less than 0.05%.

Among Fig. 1, first kind of device of the utility model comprises laser scanner 1, temperature sensor 2, data collecting card 3 and a PC 4.Certainly, in the utility model measurement mechanism, temperature sensor 2 can have a plurality of.Data collecting card 3 is electrically connected with laser scanner 1, each temperature sensor 2 and PC 4 respectively.

Use first kind of device of the utility model to can be used for measuring the volume of the bulk container of not being with liquid.Concrete grammar is following:

1) because target bulk container 7 is not with liquid, personnel can get into internal tank, and laser scanner 1 is positioned over the inside of target container 7, and each temperature sensor 2 is fixedly mounted on respectively on the sidewall of target bulk container 7.

2) carry out the spatial data that single pass obtains the inner surface of target bulk container 7 with the inner surface of 1 pair of target bulk container 7 of laser scanner, and spatial data is transmitted to data collecting card 3 through data line.

3) data collecting card 3 is gathered the temperature data of the sidewall of the measured target bulk container 7 of said spatial data and each temperature sensor 2 through data line, and spatial data that is collected and temperature data are sent to PC 4 through data line.

4) PC 4 is done data processing with received spatial data earlier: at first be noise removing, promptly eliminate unnecessary noise data through artificial or computer automatic programming.Spatial data behind the sharp then elimination noise obtains the cross-sectional area of target bulk container 7 at the differing heights place, if the figure of xsect is the geometrical rule shape, then can utilize the geometric fit mode to calculate sectional area; If the figure of xsect is an irregular figure, then can utilize the mode of integration to calculate the interface figure.At last the area according to each xsect at differing heights place combines high computational to obtain the volume of target bulk container 7.

5) utilize formula (I) that the resulting volume of step 4) is revised,

$V_{h0}=V_h-\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\θ}}_{h,i}^2(r_{h,i}^2-r_{h,i0}^2)\mathrm{\Δ}{H}_h/2---\left(I\right)$

r _h，i0＝r _h，i[1-α(t-t ₀)]

In the formula (I), V _H0Be meant at working temperature t ₀The time container at the orthobaric volume at height h place, V _hBe meant under the actual measurement situation container at the volume at height h place, N is meant that the coordinate that records on the height h place xsect counts θ _{H, i}Represent that line that the i on container height h place xsect as shown in Figure 3 puts this cross-section center and i the counter clockwise direction consecutive point of putting arrive the angle of the line of this cross-section center, r _{H, i}I on the height h place xsect that is meant at the target bulk container the measured distance of putting this cross-section center, r _{H, i20}Be meant at working temperature t ₀The time i on the height h place of target bulk container xsect put the theoretical of this cross-section center, Δ H _hThe height that is meant the target bulk container is the actual measurement height of sampling of the cross-section of h, and α is meant the linear expansion coefficient of container, and t is meant the medial temperature of vessel surface, t ₀Refer to the container work temperature.

As shown in Figure 2, second kind of device of the utility model comprises laser scanner 1, temperature sensor 2, data collecting card 3 and a PC 4.Certainly, in the utility model measurement mechanism, temperature sensor 2 can have a plurality of.Data collecting card 3 is electrically connected with laser scanner 1, each temperature sensor 2 and PC 4 respectively.

Use second kind of device of the utility model to can be used for measuring band liquid or not with the volume of the bulk container of liquid.Concrete grammar is following:

A) no matter target bulk container 7 band liquid perhaps are not with liquid, and personnel need not to get into internal tank, can laser scanner 1 be placed the outside of target bulk container 7, and each temperature sensor 2 is fixedly mounted on respectively on the sidewall of target bulk container 7.Simultaneously, liquid level gauge 5 is placed in the target bulk container 7, perhaps each pressure unit 6 is placed in the target bulk container 7, liquid level gauge and pressure unit need be put into internal tank in advance usually.

B) scan at the outside surface of each scanning website respectively with laser scanner 1, obtain the spatial data of the outside surface of target bulk container 7 target bulk container 7.According to actual conditions; Can select the scanning website more than 3 (for example as shown in Figure 4; The scanning website 8, scanning website 9 and the scanning website 10 that distribute along the excircle direction of target bulk container 7), more than the outer surface portions of guaranteeing target bulk container 7 is scanned once.Utilize the spatial data splicing function of laser scanner 1,, obtain the spatial data of the outside surface of target bulk container 7 data splicing of each scanning website.

C) data collecting card 3 is gathered the measured liquid level data of temperature data and the liquid level gauge 5 of sidewall of the measured target bulk container 7 of said spatial data and each temperature sensor 2 (the perhaps measured pressure data of each pressure unit 6) from laser scanner 1, and said spatial data and temperature data and liquid level data (perhaps pressure data) are sent to PC 4.Wherein liquid level data changes into pressure data through liquid pressure formula (III):

P＝ρgh (III)

Wherein, P is meant liquid bottom pressure, and g is meant acceleration of gravity, and ρ is meant the pot liquid average density, and h is meant liquid level.

D) PC 4 is done data processing with data collecting card 3 received spatial datas earlier:

(i) at first being noise removing, can be noise data artificial or that the computer automatic programming elimination is unnecessary.

(ii) utilize the spatial data behind the said elimination noise to obtain the cross-sectional area of target bulk container 7 then:, then can utilize the geometric fit mode to calculate sectional area if the figure of xsect is the geometrical rule shape at the differing heights place; If the figure of xsect is an irregular figure, then can utilize the mode of integration to calculate the interface figure.

(iii) obtain the volume of said target bulk container 7 at last according to each cross-sectional area combination high computational at differing heights place.

E) utilize formula (II) that the resulting volume of step d) is revised,

$V_{h0}=V_h-\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\frac{{\mathrm{\θ}}_{h,i}^2(r_{h,i}^2-r_{h,i0}^2)\mathrm{\Δ}{H}_h}{2}$

$r_{h,i0}=r_{h,i}[1-\mathrm{\α}(t-t_0)]-\frac{j(\frac{P}{\mathrm{\ρg}}\×{10}^3-h)}{2{\mathrm{\δ}}_h}\×{10}^{-4}---\left(\mathrm{II}\right)$

$j=\frac{2g(\mathrm{\ρ}-0.0011)\×r_{h,i}^2}{E}$

In the formula (II), V _H0Be meant at working temperature t ₀The time container at the volume at height h place, V _hBe meant under the actual measurement situation volume at the volume at height h place, N is meant that the coordinate that records on the height h place xsect counts θ _{H, i}Represent that line that the i on container height h place xsect as shown in Figure 3 puts this cross-section center and i the counter clockwise direction consecutive point of putting arrive the angle of the line of this cross-section center, r _{H, i}I on the height h place xsect that is meant at the target bulk container the measured distance of putting this cross-section center, r _{H, i0}Be meant at working temperature t ₀The time i on the height h place of target bulk container xsect put the theoretical of this cross-section center, Δ H _hThe height that is meant the target bulk container is the actual measurement height of sampling of the xsect of h, and α is meant the linear expansion coefficient of container, and t is meant the medial temperature of vessel surface when tested, t ₀Refer to the container work temperature, the pressure of container bottom when P is meant container band liquid, δ _hBe meant the average thickness of slab of height h place container, g is meant acceleration of gravity, and ρ is meant the pot liquid average density, and E is meant the elastic modulus of container material.

Claims (2)

1. big volumetric measurement device of the high precision based on 3 D laser scanning; It is characterized in that: comprise laser scanner (1), an above temperature sensor (2), data collecting card (3) and PC (4), said data collecting card (3) is electrically connected with said laser scanner (1), each temperature sensor (2) and PC (4) respectively.

2. the big volumetric measurement device of the high precision based on 3 D laser scanning according to claim 1 is characterized in that: also comprise liquid level gauge (5) that is electrically connected with said data collecting card (3) or the pressure unit (6) that is electrically connected with said data collecting card (3) respectively more than one.

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