Questions tagged [sensors]

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1answer
71 views

Kalman filter for sensor fusion — what is the advantage?

Is there any meaning of using Kalman Filter for cases when you do not have good statistical model of the system? For example, if you have a drone and it has IMU sensor and GPS sensor. You do not have ...
2
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2answers
46 views

Are there general-purpose acoustic FFT sensors for plant diagnostics?

For the purpose of detecting a defect or failure in a machine, it is often practical to physically listen to any abnormal noises that a machine might be making, and even use a simple stopwatch to ...
2
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4answers
431 views

How to Measure Air Flow in a Large Tunnel at Various Different Points?

I am a student who is interning at a company this summer, and I've been put in charge of its first R&D project which will require me to collect a lot of data. The machine with which I am working ...
2
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1answer
405 views

Determining frequency of an ultrasonic transducer

Ultrasonic transducers emit sound at a frequency greater that 20 KHz. What are the ways the frequency of sound emitted by such a transducer can be verified?
2
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1answer
96 views

Transducers in cuff-style blood pressure monitors

I have been doing research into blood pressure monitors, and I was wondering when the cuff tightens, how do the transducers actually measure the systolic/diastolic pressure in the arteries.
2
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2answers
120 views

How to measure changes in curvature?

I am building a device to remind myself of keeping my spine straight. I have a way to implement the "reminder" feature and the control package, but I have not found a way to measure changes in ...
2
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1answer
90 views

How to determine / control if a conveyor belt runs straight?

I'm spec'ing out a conveyor belt and want a control mechanism to make sure that it runs straight. I know there exists a product for this since I've seen the function in an older tender, but don't have ...
2
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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")?
2
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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 ...
2
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2answers
58 views

Measuring distance to a non perpendicular surface

I am a Mechanical engineering student and i am completely new to arduino and need some advice. i have a project to measure the maximum deflection in a sailplane wing (up to 9 meters) How do i measure ...
2
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2answers
62 views

How can one make the beam angle smaller on an ultrasonic sensor?

I'm trying to create higher resolution data with a beam angle of 5> degrees (as close as 1 degree as possible). I have been experimenting with creating using an aluminum casing around the sensor ...
2
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1answer
506 views

MQ3 Alcohol sensor

I have done my project on alcohol detection for drivers, but I don't know the minimum and maximum distances between the alcohol sensor and the driver. What are the maximum and minimum distances?
2
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1answer
634 views

Can lamda sensor 4.9 be used without the special LSU-IC?

I was looking into using Lambda Sensor LSU 4.9 to know the lambda value. From the datasheet, its looks though this sensors cannot be used without a special IC such as Bosch lambdatronic LT4. Can we ...
2
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2answers
97 views

Can you detect the operation of a wireless radio (or other wavelength) receiver?

I am Comp-sci student doing a software engineering paper about designing a program, planning the software like you were actually planning a real-life software project, short of writing actual pseudo-...
2
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1answer
2k views

How to measure a bearing temperature in a pump?

I found that Resistance Temperature Detectors (RTD) are mostly used for bearings, but it's not easy to drill the casing and we need to take a signal out to PLC and LabVIEW. Is there a sensor that can ...
2
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1answer
775 views

Strain gauge for wood

I have a project in mind where I want to measure the pulling force of each finger while doing a climbing exercise. My original plan was to build a wooden climbing hold that used 4 load cells under a ...
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 ...
2
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1answer
173 views

Can a load be estimated using a Kalman filter?

I have a system with a motor, some masses, damping and springs. One of the masses is loaded with an unknown external force F. I want to estimate the force F using data of the motor (mainly current). ...
2
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0answers
25 views

allan-variance noise terms of MEMS accelerometer

Specific noise terms are given in datasheets of MEMS sensors. In example the specification of accelerometer contains information about random walk and in some cases the bias instability. Both ...
2
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0answers
111 views

What is meant by “accuracy within factor of 2” in sensors?

I've spent quite some time googling the meaning of "factor of (number)" in sensor accuracy but could not find any document explaining the meaning of this expression used to describe sensor accuracy. ...
2
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0answers
36 views

What is the gel used for covering the strain gauge in the load cell?

We have one imported strain gauge load cell, which shown open circuit in the input impedance. I removed the protective gel and corrected the wiring. Now the load cell is working. But I want to cover ...
2
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0answers
59 views

How to compare two acceleration sensors side-by-side?

I have a single axis analog capacitive acceleration sensor (from PCB Piezotronics) which is very reliable but expensive. Now I need more axis, unfortunately can not afford buying anymore. So I have ...
2
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0answers
40 views

Oxygen sensors in trace gas environments

Do Oxygen lambda sensors (used in automotive applications) work in trace gas environments? My requirements for a trace Oxygen gas sensor: The sensor must be capable of working in an inert gas ...
2
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0answers
47 views

Placement of a refractory wall excess temperature sensor?

I am working on a burner management system for a gas/coal fired pulp dryer. We are providing a thermocouple temperature switch on the roof of the firebox for an Excess Temperature Limit Interlock (per ...
2
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0answers
42 views

Convergence problem in polymer - silicon structural analysis

I'm trying to model a capacitive force sensor with a bilayer configuration of polymer - Si on Mechanical APDL 16.2 . I have a 0.2 mm layer of Si deposited on 0.005 mm of polyimide polymer. My goal is ...
2
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0answers
135 views

How does smartphone VR positioning work? [closed]

I've recently came across Google's cartboard VR headset, which allows you to use your smartphone as a virtual reality device. The headset basically splits the screen in your left and right eyes, ...
1
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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 ...
1
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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
9k views

Difference between PI and PD controller?

what is the difference between a PI and a PD controller? In which instance or for what kind of sensor(s)would you use one as opposed to the other?
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1answer
3k views

What does “redundancy” mean?

What is "redundancy," exactly? As far as I know a system/component is redundant if critical components are being duplicated to ensure a higher safety level while reducing availability. Lets take a ...
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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 ...
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2answers
48 views

How do fiber optic sensors detect strains in a structure?

I am working on a project on detecting damage in structures using fiber optic sensors. I read the paper Structural Health Monitoring in Composite Structures by Fiber-Optic Sensors and found out that ...
1
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1answer
1k views

What is best sensor & method to measure human height?

My application needed to measure human height on a standing kiosk. I need to attach the sensor on kiosk ceiling type top. I used different kind of ultrasonic sensor for this purpose but nothing ...
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3answers
261 views

Measuring the level of inflation of an airbag

I want to make an inflatable seat that is electronically controlled. I am specifically looking to be able to estimate the level of inflation of an airbag using small electronic sensors. The airbag is ...
1
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1answer
151 views

Can LDR acts as a position sensor?

I am currently doing a solar tracker project. Can I use the LDR as position sensor by detecting the sunlight intensity? I mean if light intensity on LDR east is greater than LDR west, the LDR east ...
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2answers
117 views

What is this device?

So recently I went to Supercomputing 17 conference and picked this from a booth. I would like to know as to what this device is? What's its name? Where to find its documentations? Thanks
1
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1answer
61 views

Thermistor - Steinhart-Hart Coefficients

In order to identify Steinhart-Hart coefficients for a thermistor, three known temperatures may be used to find three resistances. What is the best way to choose these temperatures to calibrate ...
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2answers
54 views

Measuring the temperature of gasoline while conducting experiments over a temperature range

I am building a device to heat and measure the temperature of a small vessel (double boiler) of gasoline over a range of temperatures say -10F to 120F. I will be measuring the capacitance across a ...
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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
20 views

Sensor compatibility with power source

I have a sensor whose datasheet mentions that it should be connected to 5V Vcc. A green LED glows on the sensor when it is powered from the source at 5V. However, even if I power it with 3.3V, still ...
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1answer
33 views

Design of a hydrogen and corrosion sensor query

I’m designing a hydrogen and corrosion sensor. A thin film changes resistance based on hydrogen concentration. Then the capacitance between two electrodes will change depending on substrate thickness (...
1
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1answer
92 views

How to reduce oscillations (rapid changes of control signal) when controlling a real system, which occur due to noise in measurement from sensors?

I have a real mechanical system (ball & beam) which I want to control. The system is approximated by the second order transfer function: $$ T(s) = \frac{b_0}{s^2+a_1s+a_2} $$ and in state-space ...
1
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1answer
130 views

Is there a difference between piezo ceramic disc transducer and a piezo ceramic bender

I really do apologise if this is a stupid question but I for the life of me can't find an answer. I need to do a project where I measure the liquid of water in a tank using ultrasound and am planning ...
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1answer
31 views

Breath Sensor: A low range pressure sensor that won't be affected by humidity

I am designing a device that will measure the force of a breath through a tube. A small differential pressure sensor like this https://www.digikey.ca/product-detail/en/MPX10DP/MPX10DP-ND/464046 would ...
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1answer
166 views

What are some robust method to detect or repel lizard?

I am working on a HVAC project where lizard in going inside the electrical unit and causing wire damage and short circuit. I need to find some solution to detect or repel lizard before any ...
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1answer
573 views

How can I connect a silicon hose with 2mm inner diameter to a smaller 1,9mm port

The biggest diameter of my pressure sensor input port has a size of 1.93 mm. The silicon hose which I want to connect with the sensor's port has an inner diameter size of 2.0 mm. My honeywell ...
1
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1answer
1k views

How to increase the sensitivity range of MQ3 Alcohol sensor?

I am using an MQ3 sensor for alcohol detection but the sensing distance is short. Is there any alternative approach or solution to detect alcohol present in air from a longer distance? For example, ...
1
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1answer
80 views

How to measure electro-mechanical coupling?

I have mounted a piezo-ceramic ultrasonic transducer (MODEL # SMD10T2R111WL, Vendor Website: PIEZO CERAMIC DISC 10X2MM R 215 KHZ WIRE LEADS) under a plastic tank using epoxy. Please see the picture ...
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1answer
55 views

Is it possible to detect specific UVB wavelength ranges using just a UVM-30A UV sensor or similar

Is it possible to detect specific UVB wavelength ranges using just a UVM-30A UV sensor or similar. The sensor in consideration is GUVA-S12SD. Seems to indicate that it generates a specific current ...
1
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1answer
68 views

Precision measurement of liquid level in a tank which is continuously opened and closed

I need to measure the level of the liquid in a tank. The tank is opened and closed frequently. Measurements are made in milliseconds. I tried to measure the level of the liquid by using an ultrasonic ...