Test of Accuracy between Total Station and ADM

发布于： 2021-04-28 10:14

ADM is an Automatic Monitoring device to measure the displacement in Horizontal. But how can we verify its accuracy and stability? In this test, we will compare ADM’s deformation value with Total Station’s result, to prove ADM’s stability in monitoring direction and data.

1.Equipment used in this test

GINTEC ADMS-500,

Trimble S9 Total Station (0.5 second),

Portable Inclinometer RDM Pro.

2.Test Method

We install one 17m length inclinometer casing against the wall, and fix the chain of ADMS-500 with casing together. It’s Node/0.5m, totally 35 nodes. We stick reflector of Total Station on the surface of ADMS.

S9 total station is on the top of other building. Because the view of sight is blocked, Total Station just can measure the upper part 9.5m of ADMS.

3.Define the coordinate axis of ADM and Total Station.

X direction perpendiculars to the wall and pointing outward. The Y direction is perpendicular to the X direction and along the wall.

4.Measure and save the initial data.

Before measure and save the initial data, we recorded the reading of the ruler. From the reading we can know that the initial number is 22.5cm.

Initial Reading of Ruler

S9 total station measure and save the data from the depth of the ADM to the top of ADM. We set Total Station’s Control point coordinate as X: 100, Y:200, Z:10. R9 target at the reflector to collect data. The collection interval is 1 Point/0.5m in Z direction.

Target at reflector

Then we can get the initial data of Total Station, please check. As we said in the first part of this article, because the view of sight is blocked, Total station just measures the upper part 9.5m of ADMS

Point name	X0(Unit M)	Y0(Unit M)	Z0(Unit M)
J2.1	237.675	99.995	10.234
J2.2	237.666	100	10.739
J2.3	237.698	100.014	11.237
J2.4	237.693	100.029	11.744
J2.5	237.696	100.04	12.252
J2.6	237.702	100.05	12.761
J2.7	237.707	100.061	13.264
J2.8	237.711	100.071	13.765
J2.9	237.712	100.08	14.278
J2.10	237.717	100.087	14.784
J2.11	237.719	100.107	15.291
J2.12	237.716	100.124	15.797
J2.13	237.718	100.144	16.297
J2.14	237.722	100.161	16.801
J2.15	237.725	100.18	17.306
J2.16	237.73	100.195	17.829
J2.17	237.733	100.211	18.324
J2.18	237.74	100.237	18.84
J2.19	237.746	100.26	19.289

Initial data of Total Station

We set ADM as “Automatic Collection”, data collection frequency is 1HZ. Then we get the initial coordinates of ADMS-500.

Nodes	X0(Unit MM)	Y0(Unit MM)	Z0(Unit MM)
750035	-61.9122	-69.3756	491.2778
750034	-34.499	-24.3624	988.4924
750033	-14.8153	-52.8368	1487.2927
750032	-17.4967	-54.0379	1987.2841
750031	3.5212	-69.9656	2486.5881
750030	-13.3344	-76.8724	2986.2563
750029	-15.0006	-96.8934	3485.8525
750028	-4.169	-91.4872	3985.7061
750027	-9.3256	-82.9997	4485.6074
750026	-2.033	-82.8073	4985.5542
750025	-13.4822	-87.3524	5485.4023
750024	-10.6827	-92.8919	5985.3638
750023	-25.60526166	-91.20301231	6485.1382
750022	-29.71502749	-74.44755702	6984.8403
750021	-22.3920595	-57.3630467	7484.4946
750020	-8.065896087	-53.17759729	7984.272
750019	4.94886922	-30.69791515	8483.5967
750018	12.23872509	-24.79533481	8983.5088
750017	-25.10451108	-10.16057316	9481.8975
750016	-17.2055009	2.651821498	9981.6709
750015	-17.43879566	15.73248117	10481.5
750014	-24.44416804	24.91939089	10981.3662
750013	-16.01152037	52.95830746	11480.5078
750012	-14.0176637	56.30342952	11980.4922
750011	-16.86080239	75.61165535	12480.1113
750010	-25.0859386	85.79543235	12979.9395
750009	-29.12227592	104.2171269	13479.584
750008	-21.04237345	116.8954968	13979.3574
750007	-25.89099896	134.7152462	14479.0166
750006	-29.90424207	149.7134609	14978.7754
750005	-35.94230316	164.0839658	15478.5322
750004	-40.44604898	185.0601874	15978.0713
750003	-44.64897049	200.8524857	16477.8047
750002	-63.66818135	222.8273967	16976.959
750001	-67.27190666	253.079387	17476.0293

Initial data of ADMS-500

5.Move ADMS and Inclinometer Casing, then compare the displacement

We move the ADMS and inclinometer casing along Y axis, then record the reading number of the ruler, record the S9 Total Station’s result and ADMS-500’s data. We define the coordinate of this time is X1, Y1, Z1

(1)From this photo we can know that, after moving, the ruler reading of ADMS is 18.5cm. The displacement is 22.5-18.5=4cm=40mm

Reading after displacement

(2)Check and record the displacement of Total Station after the displacement.

Next table shows Total Station’s coordinates after displacement.

Point Name	X1	Y1	Z1
J2.1	237.674	99.994	10.236
J2.2	237.666	99.998	10.739
J2.3	237.698	100.012	11.237
J2.4	237.692	100.027	11.744
J2.5	237.695	100.037	12.253
J2.6	237.702	100.047	12.761
J2.7	237.706	100.058	13.264
J2.8	237.71	100.07	13.765
J2.9	237.712	100.078	14.279
J2.10	237.717	100.088	14.784
J2.11	237.72	100.109	15.291
J2.12	237.718	100.128	15.797
J2.13	237.72	100.154	16.296
J2.14	237.724	100.176	16.801
J2.15	237.727	100.2	17.306
J2.16	237.731	100.219	17.829
J2.17	237.735	100.239	18.324
J2.18	237.74	100.271	18.838
J2.19	237.748	100.299	19.289

Total Station’s coordinate after displacement

Then calculate the deformation value of Total Station, the deformation value is X1-X0, Y1-Y0, Z1-Z0. Unit M

Point Name	X1-X0	Y1-Y0	Z1-Z0
J2.1	-0.001	-0.001	0.002
J2.2	0	-0.002	0
J2.3	0	-0.002	0
J2.4	-0.001	-0.002	0
J2.5	-0.001	-0.003	0.001
J2.6	0	-0.003	0
J2.7	-0.001	-0.003	0
J2.8	-0.001	-0.001	0
J2.9	0	-0.002	0.001
J2.10	0	0.001	0
J2.11	0.001	0.002	0
J2.12	0.002	0.004	0
J2.13	0.002	0.01	-0.001
J2.14	0.002	0.015	0
J2.15	0.002	0.02	0
J2.16	0.001	0.024	0
J2.17	0.002	0.028	0
J2.18	0	0.034	-0.002
J2.19	0.002	0.039	0

Deformation Value of Total Station

From this deformation value we can see that at the point J2.19(Top place of Inclinometer casing), the deformation in Y is 0.039m=3.9cm=39mm. The value we read from the ruler is 40mm. Just 0.1cm difference. That means Total Station records the deformation value correctly.

(3) Check and record the deformation value of ADMS-500 after the displacement happening.

Next table shows ADMS-500’s coordinate after displacement.

Unit mm

Nodes	X1	Y1	Z1
750035	-61.861	-69.352	491.288
750034	-34.429	-24.442	988.51
750033	-14.763	-52.876	1487.31
750032	-17.463	-54.073	1987.31
750031	3.6218	-69.989	2486.61
750030	-13.164	-76.842	2986.28
750029	-14.766	-96.856	3485.87
750028	-3.8229	-91.389	3985.73
750027	-8.8288	-82.914	4485.63
750026	-1.6876	-82.51	4985.58
750025	-13.255	-86.975	5485.42
750024	-10.348	-92.573	5985.38
750023	-25.273	-91.016	6485.16
750022	-29.377	-74.442	6984.87
750021	-21.993	-57.575	7484.53
750020	-7.6029	-53.585	7984.3
750019	5.39543	-31.501	8483.65
750018	12.6269	-25.939	8983.56
750017	-24.61	-11.799	9481.98
750016	-16.59	0.62283	9981.76
750015	-16.687	13.3312	10481.6
750014	-23.636	22.3912	10981.5
750013	-15.424	50.6366	11480.6
750012	-13.518	54.2954	11980.6
750011	-17.062	74.0473	12480.2
750010	-25.971	85.6579	12980
750009	-30.951	106.06	13479.5
750008	-23.709	121.682	13979.2
750007	-29.038	144.676	14478.7
750006	-33.53	164.707	14978.2
750005	-39.924	183.926	15477.8
750004	-44.676	209.394	15977.2
750003	-49.341	229.707	16476.7
750002	-68.935	255.813	16975.7
750001	-72.514	291.528	17474.4

ADMS-500’s coordinate after displacement

Then calculate the deformation value of ADMS-500, the deformation value is X1-X0, Y1-Y0, Z1-Z0. Unit MM

Nodes	X1-X0	Y1-Y0	Z1-Z0
750035	0.0515	0.0233	0.0098
750034	0.0705	-0.08	0.018
750033	0.052	-0.0391	0.0211
750032	0.034	-0.0351	0.0211
750031	0.1006	-0.0236	0.0188
750030	0.1707	0.0305	0.0218
750029	0.2345	0.0371	0.0223
750028	0.3461	0.0986	0.019
750027	0.4968	0.0859	0.021
750026	0.3454	0.2972	0.0229
750025	0.2269	0.3779	0.021
750024	0.3351	0.3189	0.02
750023	0.332467	0.186947	0.0205
750022	0.33814	0.005451	0.0269
750021	0.399104	-0.21194	0.0332
750020	0.463013	-0.40753	0.0327
750019	0.446557	-0.8035	0.0508
750018	0.38813	-1.14354	0.0557
750017	0.494997	-1.63819	0.0781
750016	0.61564	-2.02899	0.0859
750015	0.751972	-2.40124	0.0957
750014	0.808157	-2.52823	0.0986
750013	0.587136	-2.32166	0.0908
750012	0.499372	-2.00805	0.0898
750011	-0.20086	-1.56433	0.0674
750010	-0.88481	-0.13753	0.0253
750009	-1.82922	1.842616	-0.0606
750008	-2.66689	4.786517	-0.1308
750007	-3.14678	9.960335	-0.3477
750006	-3.62585	14.99354	-0.5283
750005	-3.98196	19.84182	-0.6953
750004	-4.22982	24.33378	-0.9063
750003	-4.69166	28.8548	-1.0742
750002	-5.26651	32.98604	-1.2949
750001	-5.24255	38.4482	-1.6543

From the deformation value of ADMS-500, we can know that in Node 750001(Top of ADMS-500) the deformation value is 38.4482mm. This value is similar as Total Station’s 39mm, Ruler’s 40mm.

6.Summary

From the deformation value of ADMS-500, S9 Total Station and ruler, we can know that these 3 values are very similar. That means they all can indicate the deformation value and direction successfully. S9 total station is a recognized product with high precision and stability. ADMS-500’s result just has 0.5518mm deformation, that means ADMS-500 also has a good accuracy and stability.

Devices	S9 Total Station	Ruler	ADMS-500
Displacement value in Y	39mm	40mm	38.4482mm

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