IEEE Instrumentation & Measurement - September 2023 - 39

Given that the test environment is an indoor experiment,
20
18
16
14
12
10
8
6
4
2
Fitted value of sediment content
Standard value of sand content
the ambient variation in temperature is minimal. Therefore,
the effect of environmental variation was ignored. The standard
uncertainties were summarized based on the calculated
standard uncertainties (Table 5).
According to Table 5, synthetic standard uncertainty, formula
reference (10), was calculated to find uSc() .∆=0 0174 kg/m .
3
Taking the confidence probability p = 0.95 and k = 2,
the extended uncertainty of the calibrated device was:
U k u S
=
∗ ()= .0 0348 kg m . Then, the sand content online
c ∆
/
3
46 8101214161820
Device output current value (mA)
Fig. 6. Sediment fitting curve.
collection equipment in the sand content had standard value of
1 kgm/ .3 The fitted value of the measurement in the standard
field of sand content was 1.0148 kgm/3, and the corresponding
calibration result was: Sm =
±
3
1 0148 0 0174.. / kg m .
Field Experiments
The sand content online collection equipment was placed at
the site of Xiaokai River channel in Henan Province, and the
site testing environment is shown in Fig. 7. The sand content
sensor was placed in the water and the sand content collector
ws placed in the bank control box to compare the sand content
of the site.
Three different periods were selected, and the corresponding
number of measurement points were collected at
regular intervals for each period. The data from each point
were recorded to compare the relationship between the sand
content of suspended sediment measured by the online sand
content collection equipment and the sand content analyzed
manually in the field, and the measurement results are shown
in Fig. 8.
The measurement results showed that the sand content
Fig. 7. On-site measurement environment of sediment content.
in the three periods was different, with the sand content in
the range of 0.2-1.2 kg/m³ in the first period, 1.3-1.8 kg/m³
in the second period, and 2.0-3.5 kg/m³ in the third period.
Since the turbidity and sand grain size of the river channel
were different at different measurement stages, the measurement
results were not the same, but the overall measurement
results and curve fitting results were similar, the fitting results
were good, and the maximum relative error of the
Table 4 - Measurement results of 30 times at 1 kg/m³
Measurement
times
1
2
3
4
5
6
7
8
9
10
September 2023
Current value
(mA)
4.502
4.504
4.499
4.491
4.490
4.503
4.503
4.509
4.509
4.501
Measurement
times
11
12
13
14
15
16
17
18
19
20
Current value
(mA)
4.498
4.499
4.501
4.512
4.496
4.493
4.500
4.502
4.496
4.498
IEEE Instrumentation & Measurement Magazine
Measurement
times
21
22
23
24
25
26
27
28
29
30
Current value
(mA)
4.500
4.510
4.503
4.496
4.491
4.501
4.502
4.496
4.493
4.496
39
Sand current (kg/m3)

IEEE Instrumentation & Measurement - September 2023

Table of Contents for the Digital Edition of IEEE Instrumentation & Measurement - September 2023

Contents
IEEE Instrumentation & Measurement - September 2023 - Cover1
IEEE Instrumentation & Measurement - September 2023 - Cover2
IEEE Instrumentation & Measurement - September 2023 - Contents
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