Optoelectronic measurement system for testing the optical parameters of infrared seeker

To solve the problems that occur when farmers overuse chemical fertilizers, it is necessary to develop rapid and efficient portable measurement systems for the detection and quantification of nitrogen (N), phosphorus (P), and potassium (K) in soil. Challenges arise from the use of currently available portable instruments which only have a few channels, namely measurement and the reference channels. We report on a home-built, multichannel, optoelectronic measurement system with automatically switching light sources for the detection of N, P, K content in soil samples. This optoelectronic measurement system consists of joint LED light sources with peak emission wavelengths of 405 nm, 660 nm, and 515 nm, a photodiode array, a circuit board with a microcontroller unit (MCU), and a liquid-crystal display (LCD) touch screen. The straightforward principle for rapid detection of the extractable nutrients (N, P, K) was well-established, and characterization of the designed measurement system was done. Using this multi-channel measurement system, available nutrients extracted from six soil samples could be measured simultaneously. The absorbance compensation, concentration calibration, and nutrition measurements were performed automatically to achieve high consistency across six channels. The experimental results showed that the cumulative relative standard deviations of 1.22%, 1.27%, and 1.00% were obtained from six channels with known concentrations of standard solutions, respectively. The coefficients of correlation for the detection of extracted nutrients of N, P, K content in soil samples using both the proposed method and conventional lab-based method were 0.9010, 0.9471, and 0.8923, respectively. Experimental results show that this optoelectronic measurement system can perform the measurement of N, P, K contents of six soil samples simultaneously and may be used as an actual tool in determining nutrients in soil samples with an improvement in detection efficiency.

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A multifunction optoelectronic measurement system for ac three-phase networks

Russian Electrical Engineering ◽

10.3103/s1068371209040099 ◽

2009 ◽

Vol 80 (4) ◽

pp. 221-223

Author(s):

C. A. Zadornov ◽

A. A. Sokolovskii

Keyword(s):

Measurement System ◽

Three Phase ◽

Optoelectronic Measurement

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Curvature Detection with an Optoelectronic Measurement System Using a Self-Made Calibration Profile

Sensors ◽

10.3390/s22010051 ◽

2021 ◽

Vol 22 (1) ◽

pp. 51

Author(s):

Christoph Thorwartl ◽

Thomas Stöggl ◽

Wolfgang Teufl ◽

Helmut Holzer ◽

Josef Kröll

Keyword(s):

Measurement System ◽

Accuracy Assessment ◽

Industrial Robot ◽

Three Dimensional ◽

Maximum Error ◽

Robot Arm ◽

Average Difference ◽

Measuring Point ◽

Marker Distance ◽

Optoelectronic Measurement

So far, no studies of material deformations (e.g., bending of sports equipment) have been performed to measure the curvature (w″) using an optoelectronic measurement system OMS. To test the accuracy of the w″ measurement with an OMS (Qualisys), a calibration profile which allowed to: (i) differentiates between three w″ (0.13˙ m−1, 0.2 m−1, and 0.4 m−1) and (ii) to explore the influence of the chosen infrared marker distances (50 mm, 110 mm, and 170 mm) was used. The profile was moved three-dimensional at three different mean velocities (vzero = 0 ms−1, vslow = 0.2 ms−1, vfast = 0.4 ms−1) by an industrial robot. For the accuracy assessment, the average difference between the known w″ of the calibration profile and the detected w″ from the OMS system, the associated standard deviation (SD) and the measuring point with the largest difference compared to the defined w″ (=maximum error) were calculated. It was demonstrated that no valid w″ can be measured at marker distances of 50 mm and only to a limited extent at 110 mm. For the 170 mm marker distance, the average difference (±SD) between defined and detected w″ was less than 1.1 ± 0.1 mm−1 in the static and not greater than −3.8 ± 13.1 mm−1 in the dynamic situations. The maximum error in the static situation was small (4.0 mm−1), while in the dynamic situations there were single interfering peaks causing the maximum error to be larger (−30.2 mm−1 at a known w″ of 0.4 m−1). However, the Qualisys system measures sufficiently accurately to detect curvatures up to 0.13˙ m−1 at a marker distance of 170 mm, but signal fluctuations due to marker overlapping can occur depending on the direction of movement of the robot arm, which have to be taken into account.

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The calculating method of minimal-distance between aero-engine pipelines by using optoelectronic measurement system

2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems ◽

10.1117/12.2543161 ◽

2020 ◽

Author(s):

Ziyue Zhao

Keyword(s):

Measurement System ◽

Minimal Distance ◽

Calculating Method ◽

Aero Engine ◽

Optoelectronic Measurement

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Leg Volume Measurements with a Modified Optoelectronic Measurement System

Phlebology The Journal of Venous Disease ◽

10.1177/026835559501000206 ◽

1995 ◽

Vol 10 (2) ◽

pp. 62-64 ◽

Cited By ~ 7

Author(s):

J. C. J. M. Veraart ◽

H. A. M. Neumann

Keyword(s):

Healthy Volunteer ◽

The Netherlands ◽

Healthy Volunteers ◽

Outcome Measures ◽

Measurement System ◽

Volume Measurement ◽

Laser Pointer ◽

Interobserver Reproducibility ◽

Volume Measurements ◽

Optoelectronic Measurement

Objective: To evaluate the reproducibility of a modified optoelectronic volume measurement system (the volometer). Design: In the first part of the study healthy volunteers and one investigator were used to evaluate the intraobserver reproducibility; in the second part one healthy volunteer and different investigators were used to evaluate the interobserver reproducibility. Setting: Department of Dermatology, Academisch Ziekenhuis Maastrict, The Netherlands. Patients: Twenty healthy volunteers for the first part of the study; eight doctors and one healthy volunteer for the second part. Main outcome measures: Optoelectronic volume measurements on one leg over a standard distance of 40 cm and over 20 cm with the use of a laser pointer as calibration. A total of eight measurements were performed on each volunteer. The same procedure was performed by different investigators on one volunteer. Results: The modified optoelectronic measurement system with laser pointer calibration showed an improvement of the reproducibility of 27% in the intraobserver study. An improvement of 11% was found in the interobserver study. Conclusions: The modified optoelectronic volume measurement system (the volometer) provides a better reproducibility than the standard system. The instrument can be used for easy and rapid volume measurements in phlebological practice.

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Research on Measurement System of Biological Tissue Parameters Based on Optical Coherence Tomography

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.333-335.135 ◽

2013 ◽

Vol 333-335 ◽

pp. 135-139

Author(s):

Hai Ye ◽

Ying Jun Gao

Keyword(s):

Optical Coherence Tomography ◽

Refractive Index ◽

Measurement System ◽

Biological Tissue ◽

Scattering Coefficient ◽

Optical Parameters ◽

Optical Coherence ◽

Tissue Samples ◽

Non Invasive ◽

Experimental Values

In order to measure the optical parameters of biological tissue accurately and non-invasive, the measurement system based on optical coherence tomography was analyzed and designed from two aspects of hardware and software. The refractive index was calibrated by standard refractive index solutions, experiments were preformed to obtain refractive index of tissue samples and scattering coefficient of IntralipidTMsolution with different concentrations. Results show that the experimental values of refractive index agree with the standard values roughly and scattering coefficient linear relate with concentration in IntralipidTMsolution. The measurement system designed in our experiment is accurate and reliable, simple and feasible.

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