scholarly journals Lensless Multispectral Camera Based on a Coded Aperture Array

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7757
Author(s):  
Jianwei Wang ◽  
Yan Zhao

Multispectral imaging can be applied to water quality monitoring, medical diagnosis, and other applications, but the principle of multispectral imaging is different from the principle of hyper-spectral imaging. Multispectral imaging is generally achieved through filters, so multiple photos are required to obtain spectral information. Using multiple detectors to take pictures at the same time increases the complexity and cost of the system. This paper proposes a simple multispectral camera based on lensless imaging, which does not require multiple lenses. The core of the system is the multispectral coding aperture. The coding aperture is divided into different regions and each region transmits the light of one wavelength, such that the spectral information of the target can be coded. By solving the inverse problem of sparse constraints, the multispectral information of the target is inverted. Herein, we analyzed the characteristics of this multispectral camera and developed a principle prototype to obtain experimental results.

2014 ◽  
Vol 716-717 ◽  
pp. 911-914
Author(s):  
Rui Wang ◽  
Kai Yuan Zhang ◽  
Le Zhang

As for the severe situation of mine water hazard in our country, it is extremely urgent to find ways of preventing and managing mine water hazard. This paper proposes a design of system which adopts fluorescence detecting technology and uses SOPC as the core control module, it can quickly detect the changes of mine water hazard source.This system collects signal of fluorescence produced in laser irradiation of water, and turns it into electric signal which is later be collected by ADC and then sends the digital data into FPGA for storing and managing. SOPC is designed in QuartusIIsoftware, and program code is designed in NiosIIsoftware, which will finally be downloaded into FPGA. A test of data collecting, handling and storing is carried out in the lab to verify the feasibility of the system. The results show that the system can efficiently detect the changes of mine water hazard source.


2011 ◽  
Vol 121-126 ◽  
pp. 677-681
Author(s):  
Jian Wang

This paper has proposed a remote water quality monitoring system based on ZigBee. The core of this system is the ZigBee wireless sensor network and GPRS network. Adopting the WSN tree routing structure and false alarm optimization algorithm, it can realize the remote detection and real-time monitoring of water quality. The clients can get access to the present and historical information of water quality conveniently,on which reasonable judgments can be formed to help with the management of water resources. The test in the West Trunk Canal of the Four-Lake Basin shows that the system has a high stability, high efficiency and great expandability.


2013 ◽  
Vol 133 (8) ◽  
pp. 1616-1624
Author(s):  
Zu Soh ◽  
Kentaro Miyamoto ◽  
Akira Hirano ◽  
Toshio Tsuji

2016 ◽  
Vol 15 (5) ◽  
pp. 1069-1074 ◽  
Author(s):  
Violeta-Monica Radu ◽  
Alexandru Anton Ivanov ◽  
Petra Ionescu ◽  
Gyorgy Deak ◽  
Marian Tudor

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