This document discusses different types of sensors used in industry. It describes sensors such as trip switches, strain gauges, optical sensors like photodiodes, optoswitches, and proximity sensors including inductive, capacitive, ultrasonic, and optical varieties. Position sensors like potentiometric, LVDT, encoders, magnetic pickups, and linear sensors are also covered. The document provides details on operation and applications of these various sensors.
Float level sensors are continuous level sensors attributing a magnetic float that move up and down as liquid levels change. The movement of the float creates a magnetic field that actuates a hermetically sealed reed switch in the stem of the level sensor, triggering the switch to open or close.
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. It detects An Object When The Object Approaches Within The Detection Range And Boundary Of The Sensor. Proximity Sensor Includes All The Sensor That Perform Non-Contact Detection In Comparison To Sensors Such As Limit Switch, That Detect The Object By Physically Contacting Them. It is a sensor able to detect the presence of nearby objects without any physical contact
Float level sensors are continuous level sensors attributing a magnetic float that move up and down as liquid levels change. The movement of the float creates a magnetic field that actuates a hermetically sealed reed switch in the stem of the level sensor, triggering the switch to open or close.
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. It detects An Object When The Object Approaches Within The Detection Range And Boundary Of The Sensor. Proximity Sensor Includes All The Sensor That Perform Non-Contact Detection In Comparison To Sensors Such As Limit Switch, That Detect The Object By Physically Contacting Them. It is a sensor able to detect the presence of nearby objects without any physical contact
Requirements of a sensor, Principles and Applications of the following types of sensors- Position sensors - Piezo Electric Sensor, LVDT, Resolvers, Optical Encoders, pneumatic Position Sensors, Range Sensors Triangulations Principles, Structured, Lighting Approach, Time of Flight, Range Finders, Laser Range Meters, Touch Sensors ,binary Sensors., Analog Sensors, Wrist Sensors, Compliance Sensors, Slip Sensors, Camera, Frame Grabber, Sensing and Digitizing Image Data- Signal Conversion, Image Storage, Lighting Techniques, Image Processing and Analysis-Data Reduction, Segmentation, Feature Extraction, Object Recognition, Other Algorithms, Applications- Inspection, Identification, Visual Serving and Navigation.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
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CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
2. 2
Sensors
• Allow a design to respond to its
environment – e.g. a line following robot
may use photosensors to detect a paint
line on the floor.
• Enable systems to determine when the
required action has been completed; for
example a trip switch will indicate that a lift
has reached the desired floor.
3. 3
Trip switches
Perhaps the most common sensor used in industry
is the trip switch or limit switch – a simple
microswitch in an industry-sealed case with a
rugged mechanical activation system such as a
lever + roller as shown above
4. 4
Strain gauges
Also extremely widely used,
strain gauges measure the
amount of extension or
compression experienced by
the material it is fastened to.
This gives a measure of the
strain, and can thus be used
to measure deformation or
applied load.
5. 5
Optical sensors
• Photodiodes and phototransistors
• Integrated photoswitches
• Light dependent resistors
• Diode arrays (1d & 2d)
• CCTV & digital cameras
• Low light sensors e.g. photomultipliers
• No moving parts so inherently reliable BUT
• Susceptible to dirt and changes in ambient light
7. 7
OptoSwitches
Sensors comprising a light
source, photodiode and
amplifier
Diffuse scan – detects
reflected light
Through scan – detects
when beam is interrupted
Hall effect sensor also
shown here detects when
a ferrous metal breaks the
magnetic field
8. 8
Proximity sensors
Types:
• Mechanical
• Inductive
• Capacitive
• Ultrasonic
• Optical
Application etc.
• Contact sensing
• Ferrous only 1cm
• Metals only 1cm
• 6m range solid/liquid/powder
• Through beam or
• Reflective
• Clean environments only
9. 9
Non-contact sensors (1)
Inductive proximity sensor
Coil inductance increases
as iron / steel object (S )
gets closer, because lines
of magnetic flux can flow
through the iron, making
the effective path shorter.
Capacitive proximity sensor
C1
C3
C2
Capacitance increases as metal
object (P) gets closer because
additional capacitance paths C2 &
C3 are added and increase in value
as the separation reduces. C1 is
always present.
S P
10. 10
Non-contact sensors (2)
Other non-contact sensors use sound
(ultrasonic) or electromagnetic waves (light,
microwaves, etc.) to gather information
about the distance between the sensor and
a surface.
Microwave sensors are reliable in dirty
industrial environments but exposure of
personnel must be prevented.
12. 12
Rotary and linear position
• Potentiometric (sliding contact)
• LVDT
• Encoders
Main issues: operating conditions, reliability,
analog or digital output
Contact or non contact - is wear important?
13. 13
Magnetic pick-ups
Often used to detect
engine timing by counting
teeth on the starter gear.
Robust, reliable non-
contact
14. 14
Rotary shaft encoder
Gives a digital output indicating
the angular position of a shaft.
They often use a disk with marks
like a bar code, that are read by
optical photodetectors inside the
encoder.
Robust, reliable non-contact.
15. 15
Absolute rotary encoder
An absolute encoder has a number of binary outputs that
indicate the switch shaft's absolute rotational position
referenced to some spot on the switch's body. For
example, a three bit absolute rotary encoder will divide the
rotational position into eight sectors. Absolute encoders are
available in a variety of style with a variety of resolutions.
16. 16
Incremental rotary encoder
An incremental rotary encoder won't tell you where the shaft is positioned. It will only
tell which direction the shaft is being turned and how fast. Incremental encoders have
two outputs called phases. Each outputs a square wave. Turning the shaft one
direction causes one phase to lead the other by 90 degrees. Reversing the direction
will cause the other phase to lead. The frequency of the output is proportional to the
rotational speed of the shaft.
18. 18
Linear position
• Linear Variable
Differential Transformer
• Other (cheaper!) linear
position sensors use a
resistive track and slider
but this is less precise
and reliable due to wear
of the track
19. 19
Potentiometric sensors
+
-
Resistive track may be wire wound on a
former, metal film or graphite on
substrate L
x
Vs
Vout
The voltage picked off is proportional to the position of the sliding
contact
Vout = Vs * x / L
20. 20
Open loop control
• Simple and easy to implement
• No feedback of controlled parameter
• No certainty that parameter is at desired
value
• Change in system parameters such as
load will result in a deviation from the
desired value
21. 21
Servo systems
Measure output variable
Compare to desired value
Amplify the difference
Apply to correct the error
Result: servo system can adjust for
changes in load, amplifier gain etc and still
give good compliance with required value