A High-Accuracy, High-Resolution, and Low-Cost All-Digital Temperature Sensor Using a Voltage Compensation Ring Oscillator

2016 ◽  
Vol 16 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Yu-Lung Lo ◽  
Yu-Ting Chiu
Keyword(s):  
High Resolution ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Accuracy ◽  
Ring Oscillator ◽  
Voltage Compensation ◽  
Digital Temperature Sensor

scholarly journals Improving the Accuracy of Low-Cost Sensor Measurements for Freezer Automation

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6389
Author(s):  
Kyriakos Koritsoglou ◽  
Vasileios Christou ◽  
Georgios Ntritsos ◽  
Georgios Tsoumanis ◽  
Markos G. Tsipouras ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Nonlinear Response ◽  
Low Cost ◽  
Absolute Error ◽  
Machine Learning Algorithms ◽  
Generalization Error ◽  
Acceptable Error ◽  
The Mean ◽  
Digital Temperature Sensor ◽  
Monitoring Devices

In this work, a regression method is implemented on a low-cost digital temperature sensor to improve the sensor’s accuracy; thus, following the EN12830 European standard. This standard defines that the maximum acceptable error regarding temperature monitoring devices should not exceed 1 °C for the refrigeration and freezer areas. The purpose of the proposed method is to improve the accuracy of a low-cost digital temperature sensor by correcting its nonlinear response using simple linear regression (SLR). In the experimental part of this study, the proposed method’s outcome (in a custom created dataset containing values taken from a refrigerator) is compared against the values taken from a sensor complying with the EN12830 standard. The experimental results confirmed that the proposed method reduced the mean absolute error (MAE) by 82% for the refrigeration area and 69% for the freezer area—resulting in the accuracy improvement of the low-cost digital temperature sensor. Moreover, it managed to achieve a lower generalization error on the test set when compared to three other machine learning algorithms (SVM, B-ELM, and OS-ELM).

scholarly journals SLIC SUPERPIXELS FOR OBJECT DELINEATION FROM UAV DATA

2017 ◽  
Vol IV-2/W3 ◽  
pp. 9-16 ◽  
Author(s):  
S. Crommelinck ◽  
R. Bennett ◽  
M. Gerke ◽  
M. N. Koeva ◽  
M. Y. Yang ◽  
...  
Keyword(s):  
High Resolution ◽  
Low Cost ◽  
High Accuracy ◽  
Numerous Application ◽  
High Resolution Data ◽  
Cadastral Maps ◽  
Simple Linear Iterative Clustering ◽  
Object Delineation ◽  
Application Fields ◽  
Future Work

Unmanned aerial vehicles (UAV) are increasingly investigated with regard to their potential to create and update (cadastral) maps. UAVs provide a flexible and low-cost platform for high-resolution data, from which object outlines can be accurately delineated. This delineation could be automated with image analysis methods to improve existing mapping procedures that are cost, time and labor intensive and of little reproducibility. This study investigates a superpixel approach, namely simple linear iterative clustering (SLIC), in terms of its applicability to UAV data. The approach is investigated in terms of its applicability to high-resolution UAV orthoimages and in terms of its ability to delineate object outlines of roads and roofs. Results show that the approach is applicable to UAV orthoimages of 0.05 m GSD and extents of 100 million and 400 million pixels. Further, the approach delineates the objects with the high accuracy provided by the UAV orthoimages at completeness rates of up to 64 %. The approach is not suitable as a standalone approach for object delineation. However, it shows high potential for a combination with further methods that delineate objects at higher correctness rates in exchange of a lower localization quality. This study provides a basis for future work that will focus on the incorporation of multiple methods for an interactive, comprehensive and accurate object delineation from UAV data. This aims to support numerous application fields such as topographic and cadastral mapping.

scholarly journals Accurate Flexible Temperature Sensor Based on Laser-Induced Graphene Material

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Huang Kun ◽  
Liu Bin ◽  
Mostafa Orban ◽  
Qiu Donghai ◽  
Yang Hongbo
Keyword(s):  
Body Temperature ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Accuracy ◽  
Vital Role ◽  
Infrared Thermometer ◽  
High Measurement ◽  
Human Body Temperature ◽  
Temperature Ranges ◽  
Resistance Value

Body temperature is an essential physiological index reflecting human health. Accurate measurements of body temperature play a vital role in the diagnosis and treatment of diseases. In this paper, a temperature sensor manufactured by laser-induced graphene is introduced. This sensor has high measurement accuracy, simple preparation, and low production cost. The sensor is made of laser-induced graphene and is easier to fabricate and operate than traditional thermal resistance sensors. The sensor is of high accuracy, is easy to manufacture, and is of low cost. The sensor has high accuracy and is linear between 30°C and 40°C in the human body temperature ranges. Laser-induced graphene (LIG) sensor’s resistance value is correlated linearly with the temperature value, and compared with the infrared thermometer, the accuracy of the sensor is ±0.15°C while that of the infrared thermometer is ±0.30°C. The sensitivity of the LIG sensor is − 0.04145 % ° C − 1 .

Development of a Highly Miniaturized PQT-Sensor for Monitoring and Diagnosing of Pneumatic Systems

2007 ◽  
Author(s):  
Christoph Sosna ◽  
Rainer Buchner ◽  
Walter Lang ◽  
Wolfgang Benecke ◽  
Christian Boehm ◽  
...  
Keyword(s):  
High Resolution ◽  
First Principles ◽  
High Performance ◽  
Low Cost ◽  
Fast Response ◽  
High Accuracy ◽  
Measuring Range ◽  
Micro Electro Mechanical Systems ◽  
Diagnostic Applications ◽  
Design Proposal

In this paper a feasibility study of a micromachined PQT-sensor for measurement of pressure (P), flow rate (Q), and temperature (T) for diagnostic applications in pneumatic systems is presented. As a low cost device this innovative PQT-sensor has to fulfill different kinds of criteria such as wide measuring range, fast response time, high resolution and high accuracy for diagnosing the health status of a pneumatic system. By using micro electro mechanical systems (MEMS) technologies small high-performance sensors were fabricated which fulfill all these criteria. At first, principles will be described that have been chosen for measurement of pressure, flow and temperature that will be used for the PQT-sensor. A design proposal for the sensor will be presented and verified with analytical calculations to show its applicability.

scholarly journals Desenvolvimento de material didático para uso em aulas práticas de metrologia industrial

2018 ◽  
Vol 1 (39) ◽  
pp. 46
Author(s):  
Fabio Luis Nardin ◽  
Fabricio Tadeu Paziani ◽  
Flavio Yuko Watanabe ◽  
Rafael Vidal Aroca
Keyword(s):  
High Resolution ◽  
Mechanical Engineering ◽  
Low Cost ◽  
High Accuracy ◽  
Manufacturing Processes ◽  
Universal Measuring ◽  
Linear Measuring ◽  
Constructive Process ◽  
Measuring Machine ◽  
Design And Construction

<p>In the current economic scenario of the Brazilian federal universities, it is a great challenge to acquire high resolution and high accuracy equipment for use in metrology practical classes. As an alternative, it is common the development of projects aiming the design and construction of low-cost courseware equipment. They are built within extension activities involving graduation students. This paper reports the development of two pieces of equipment for use in practical classes of the discipline “Principles of Industrial Metrology”, of the Mechanical Engineering course at the Federal University of São Carlos (UFSCar). The activity was supported by the Extension Office (ProEx) and had, as a premise, the use of low-cost materials and manufacturing processes. Within the proposed scope, a universal measuring table and a linear measuring machine were developed. The constructive process allowed to verify that the exercise of simple practices is a motivating experience for the student who was directly involved in the activity and for the students who use the produced equipment.</p>

scholarly journals The Open Polarimeter: A High-Resolution Instrument Made from Inexpensive Optomechanical Parts

2020 ◽  
Author(s):  
Andrew Harvie ◽  
John de Mello
Keyword(s):  
High Resolution ◽  
Low Cost ◽  
Source Code ◽  
High Accuracy ◽  
Optical Systems ◽  
3D Printer ◽  
Milling Machine ◽  
Open Hardware

The Open Polarimeter (“Opol”) is a phase-based, high-resolution laser polarimeter formed from a small number of inexpensive optomechanical parts. The complete instrument can be assembled from scratch in two days for less than US$250, using only a 3D-printer and a benchtop milling machine. However despite its low cost Opol achieves a high accuracy of a few millidegrees, comparable to far costlier commercial instruments. It is released here as open hardware, with technical diagrams, a full parts list, and source-code for its firmware included as Supporting Information. Beyond polarimetry, Opol’s easy-to-build and versatile optical mounting system is likely to prove useful for a wide variety of optical systems.

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