Teng, Jie, Wang, Shaorong and Jiang, Lin 
ORCID: 0000-0001-6531-2791
(2021)
A novel coordinated detection method for transmissive/reflective sensors against strong in-band interference.
MEASUREMENT, 169.
p. 108357.
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Measurement Wangle 2020 Manuscript.pdf - Author Accepted Manuscript Download (3MB) | Preview |
Abstract
Accuracy of transmissive/reflective sensors is usually degraded by strong in-band interference, especially those with frequencies very close or even equal to that of the measured signal. To tackle this challenge, this paper proposes a novel detection method including three units: a coordinated modulator (CM), a high-performance analog narrow-band filter (ANBF), and a smart digital filtering algorithm (SDFA). The CM performs a mixed function of amplitude modulation and phase modulation, and is used to control the sensor's transmitter to circularly transmit the signal modulated according to the coordinated time-sequence requirement from the SDFA. The ANBF has a very narrow passband to make the analog signal sampled by the SDFA only include the measured signal and an in-band interfering component. The SDFA utilizes the properties of odd/even functions and the definitions of power in A.C. circuit to filter out the in-band interfering component, with the coordination of the CM and ANBF. Effectiveness of the proposed method is validated via simulations and laboratory tests setting up based on a real application case of electromagnetic mold level detection under mold-electromagnetic stirring operating condition. Test results show that the proposed method can effectively deal with strong in-band interfering signal with the frequency very close or even equal to that of the measured signal. In the total of 20000 simulation cases, attenuations of in-band interference can exceed −76 dB. Moreover, in the experimental tests under a condition of −40 dB signal-to-noise ratio, measurement errors of the amplitude of the measured signal can be achieved less than 1.88%.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Transmissive/reflective sensor, Detection method against in-band interference, Coordinated modulation, Digital filtering algorithm, Odd/even function properties, Electromagnetic mold level detection |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 24 Aug 2020 07:36 |
| Last Modified: | 18 Jan 2023 23:36 |
| DOI: | 10.1016/j.measurement.2020.108357 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3098363 |
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