Questions tagged [sensors]

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1answer
65 views

Resistive force sensor: some basic questions about its functionality

I want to know what the circular force sensor outputs when it is connected to the breadboard (with resistor). Does it output force measured in grams? When I slightly touch the sensor with a finger, ...
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2answers
258 views

How can I determine how many cycles to average for when taking a measurement using Lock-in Amp if I know sensor spectral noise density?

I am taking a phase sensitive measurement of an AC magnetic field using an SR830 Lock-In Amplifier and a magnetic sensor. I know I have to average over a number of measurement cycles to get an ...
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2answers
1k views

Is the reliability of automotive sensor technology impeding the success of self driving car?

The reality is that sci-fi KITT is almost here. Recently I read articles Delphi car driving itself across the country as well as Tesla cars will be self-driving this summer. As of 2013 four states (...
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3answers
841 views

Can sensors detect objects 200 metres away?

I saw in this post on Self driving cars that said the cars developed by Google for the Google Self Driving Car Project, have sensors that can detect objects like humans, plastic bags within a range of ...
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1answer
4k views

What does “BSL Accuracy” mean?

An example is this pressure transmitter which has a BSL accuracy of 0.08%. I know the term "Best fit straight line" - BFSL. Is BSL just a short hand for this ("Best straight line")?
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3answers
767 views

How do robots maintain stability?

I've been watching a clip of a robot dragging a heavy load behind it. I am wondering, in a fairly high level, how does the robot maintain its balance? For example, I know that with a Segway, there ...
2
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1answer
69 views

What paint/spray on material should I use to insulate a metal pole?

I am not entirely sure if this is the correct forum to ask this question so please refer me on if there is a better arena. I am creating a small weather station and I wish to measure soil ...
3
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2answers
620 views

What type of test signal is appropriate for frequency response analysis of string instruments?

I want to test the frequency response of stringed musical instruments . My test set-up includes a piezo film transducer which is just taped onto the instrument and fed a signal which then vibrates the ...
4
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1answer
954 views

Uncertainty Calculation of LVDT displacement transducers for length measurement

I have to calculate the uncertainty of measurement for an LVDT Linear displacement transducer used for measuring length. Uncertainty calculations are ruled by ISO 17025 but there are no (at least ...
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1answer
1k views

Which part of an aircraft can most benefit from a structural health monitoring (SHM) system?

In order to reduce operational cost and improve the safety and reliability of aircraft's the aerospace industry and government is increasingly evaluating new ideas such structural heath monitoring ...
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3answers
210 views

Would it be hard to create a camera that could see the whole electro-magnetic spectrum? [closed]

Usual cameras can capture the visible spectrum, and some others the infra-red spectrum. But the world is so much than that, isn't it? I wonder why cameras that could see a larger electro-magnetic ...
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0answers
510 views

Deriving relationship between LVDT and mass spring damper

I have this system below. It is the schematic of a linear accelerometer moving horizontally, where $m$ is the total mass of the slide, $b$ denotes the viscous damping, and $k$ represents the spring ...
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2answers
862 views

Short range distance estimation systems

Is there any emitter/receiver (passive or active) systems that allow distance estimation in the range of 1~2 meters with an accuracy of few centimetres and don't need to have a direct line of sight as ...
1
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1answer
149 views

From strain to displacement in 3d

I got a question thats been bugging me for a while: Say that you're given a straight square beam (say one meter long), and you attach three strain gauges on each face. One at 0 degrees, one at 45 ...
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1answer
169 views

IR sensor with carbon fibre

Is it possible to use an IR sensor to differentiate accurately between carbon fiber and a human hand kept on the carbon fiber surface? I would like to move the sensor from one end of the carbon fiber ...
9
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1answer
296 views

Sensors / processing algorithms to emulate a human's sense of smell

A lot of research has been devoted to creating electrical devices that emulate biological sensors, including: Visual: Cameras, color/light intensity sensors Auditory: Microphones, ultrasonic sensors ...
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1answer
147 views

What is the meaning of a “trip angle” in a level sensor?

What does trip angle mean in the context of slope / level sensors / inclinometers?
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0answers
118 views

Schematic Reading - Fluid Control Limit Switch Question

Does limit switch LS1 remain pressed on until the piston moves to LS2?
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1answer
1k views

Fan Sensors (Tachometer vs Locked Rotor)

With regard to Fan Sensors, there are two very common methods for detecting whether the fan is doing what it's supposed to or not. Locked Rotor- Detects when the fan is working, or when it has ...
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1answer
194 views

Px26-015 pressure sensors output

I had a PC Mountable Wet/Wet Differential Pressure Sensor I used it to measure a pressure difference , I don't know how to convert its output to pressure !
3
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1answer
292 views

How does the glass layer transfer the touch to the touch sensitive layer on Galaxy phones?

I have a Galaxy Note2 with a front glass layer that is broken, while the screen itself is ok, as well as the touch panel. If I understand properly, the front glass has only a protective function and ...
4
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1answer
490 views

Tracking location and direction without GPS?

How can I track a device's location (x,y,z coordinates) as well as the direction the device is facing (north, south, up, down, etc.)? Standard accelerometers are not precise enough for very small ...
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1answer
176 views

What is meant by the terms “low pass sensor” and “band pass sensor” in a course syllabus?

I am doing B.E. in Mechatronics Engineering. I am due to take a subject called 'Sensors and instrumentation'. So far I only have the syllabus for the course. I decided to do some reading in advance of ...
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3answers
132 views

Help with closed loop heat controller (for a non engineer)

I am interested in setting up a controller which can modulate the output of 2 hotpads based on input from an infrared thermometer. The hotpads have their own dials, but I am considering controlling ...
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5answers
765 views

How can I measure the thickness of a sedimentation layer in a closed tank?

Biogas slurry often contains sand and grit and organic matter that eventually sediments. Clearing thetank from sedimentation is expensive (plant downtime, additional equipment) and dangerous. So it ...
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2answers
116 views

How fast can a VEX robotics light sensor operate?

In my engineering class we must make a machine that can sort 15 marbles with 3 different types in less than 2 minutes. I plan on having one marble go over/under a light sensor with a flashlight on the ...
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1answer
358 views

What type of sensing element is used in Water Quality Monitoring Meters?

What type of sensing element is used in Water Quality Monitoring meters such as those pictured below? I might not be using the correct search terms. Some of these meters monitor Total Dissolved ...
5
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1answer
420 views

What kind of motion information can be extracted from 3-axis accelerometer and 3-axis gyroscope sensor data

I have 3-axis accelerometer and 3-axis gyroscope sensor data coming from my bike trip. Until now I have extracted only basic information like overspeeding, hard acceleration and sudden turns. What ...
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1answer
160 views

What is a good sensing element to monitor corrosion in a bridge structural health monitoring system?

The question relating to measuring structural integrity of bridges brought awareness to six categories of structural health monitoring of bridges. They are Bridge foundations Concrete ...
11
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1answer
667 views

How do ultrasonic proximity sensors detect motorcycles differently from cars and trucks?

My car has ultrasonic proximity sensors to help me park. I've noticed that when motorcycles whiz past me the proximity alarm goes off. I originally thought that the motorcycles were just too close, ...
9
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3answers
1k views

Can the structural integrity of bridges be measured in real-time for safety?

As a follow up to this question, I wonder if structural integrity monitoring information can be provided real-time and to a sufficient degree that safety decisions can realistically be made from the ...
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2answers
153 views

How to sense displacement without using any camera?

I am working on a hand-held prototype model in which I need to fix motor RPM below a certain displacement. For example, if overall displacement is within 5 mm then the motor should be running at a ...

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