Questions tagged [sensors]

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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 ...
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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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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 ...
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3answers
1k views

How to test connectivity between wire and piezo-ceramic transducer

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 below ...
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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 ...
3
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1answer
85 views

mounting a transducer under a polycarbonate jar for fluid level detection

I am working with a tdc1000-tdc7200 evm board for water level detection. I am trying to mount a steminc 1MHz ultrasonic transducer under a polycarbonate jar to measure the water level in the jar. ...
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1answer
687 views

Multi Ratio Current Transformers

I encountered a problem in measuring electrical energy using a multi ratio current transformer (CT). The catalogue of CTs is unavailable. I have little information about the type of CT I am using. I ...
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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 ...
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51 views

Leakage detection system along the pipe

I want to design a leakage detection system along the pipeline that will use differences in pressure of flowing liquid (change in pressure between two points). Which sensor I should use?
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1answer
39 views

How to turn a photo receptive sensor into an emitter of light? [closed]

I try to understand how is possible to turn a photo receptive sensor into an emitter of light. Settings, tools, modulation..
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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 ...
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0answers
90 views

Flex sensor vs stretch sensor [closed]

I want to use sensor for stretchable or bendable movements on knees, on fabric. But I am confused that which sensor is better to use and why?
5
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3answers
162 views

Measuring the road surface quality

First of all, excuse my little knowledge, I'm a computer programmer by trade and unfortunately have very little knowledge of physics, engineering, DSP but I'm willing to learn. I would like to ...
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3answers
162 views

How can I build a proximity sensor?

I want to build a proximity sensor that will detect if an object is within 100 cm of the sensor and then send a signal to a raspberry pi. What type of short range detection device should I use to ...
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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
39 views

Infrared thermometer unreliable [closed]

I have an infrared thermometer that supposedly goes up to 1200F (https://www.amazon.com/gp/product/B00IT0ODPQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1). However, I used this on my electric ...
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2answers
729 views

How reliable is a QR code reader?

I'm currently designing a project for a local museum through Purdue University's engineering class. My team has come down to three options: Trying on a space suit with functioning parts Looking ...
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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, ...
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1answer
376 views

Selecting the correct strain gauge and metal thickness for custom load cell

I'm working on project and after a good amount of research I've ended up with a final design that looks roughly like this: The design is inspired by load cells used in bathroom scales, but I found ...
5
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2answers
308 views

How to obtain sensor failure probabilities?

I'm a computer science student doing research in wireless sensor networks (WSN) optimization. Based on past research works, sensors are capable of failing due to a number of factors such as harsh ...
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 ...
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2answers
85 views

Is there any good way to measure humidity constantly in a concrete block?

So, there is this teacher who wants to test how an chemical compound acts in the velocity of drying in concrete. Basically, i want to measure continuously (it would be great if i could do it with an ...
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0answers
60 views

What is the relation between frequency of piezo element and its shape?

I was reading about piezo elements and its frequency. I found on the internet that : The composition of the ceramic material and the shape and volume of the element determine the resonance frequency ...
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1answer
77 views

FFT output for noise sensor shifts after some time

I am using a noise sensor (ADMP401) along with Arduino Mega. I use FFT to convert the noise sensor analog output to frequency domain, then remove the first 30 bins (to remove some board noise), then ...
2
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1answer
403 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.
3
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1answer
103 views

Autonomous RC car trying to stop at a point

I am doing a robotics project. The goal is to make an autonomous car start from one point and stop at another point around 10 +-1 meters away. I need to make a steering mechanism. I want to be as ...
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 ...
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3answers
260 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 ...
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2answers
282 views

How do I sense reflective tape such as on a spinning wheel?

I know that the frequency and rotational speed of a spinning shaft or wheel is measured using a device that senses a piece of reflective tape on one of the rotating components. I am thinking a laser ...
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1answer
44 views

How to find the positioning of cutter machine with high accuracy with digital sensor?

I have an old vertical and horizontal cutting machine that is working manually it is kind of useless because it is hard to make accurate measurements. I want to use two digital sensor (with output for ...
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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3answers
1k views

How to measure height of water

I am trying to measure the height [level] of the water in a box that goes from -3°C (saltwater) with water and 150°C dry. Objects will be placed inside the box but will not take up the whole area. I ...
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1answer
72 views

Balancing a copter with just gyro data [duplicate]

It seems like pitch angle could be computed from just gyro data, which uses 2 gyros. However, isn't pitch computed from acceleration rather than gyro data? ...
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1answer
89 views

How to mount an O-ring differential pressure sensor in a pipe

I am trying to figure out the best way to connect an O-ring mounted differential pressure sensor into 1/8" female NPT. Ideally would like to do it with something like aluminum tubing, but I'm not sure ...
5
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2answers
501 views

Seeing through walls and noninvasive structural integrity metrics

Walking into a building, how does one find out where the pipes are, how strong the walls are (currently) and other key structural integrity measures? without breaking walls or utilising harmful-to-...
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3answers
699 views

Can Fast Fourier Transform be used to monitor for fault vibrations in a hard disk?

We want to monitor hard disks for present problems or pending failure. Can the Fast Fourier Transform (FFT) of a given hard disk in question, then, be compared with a reference FFT for a perfectly ...
3
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1answer
178 views

What sensors should be used to analyze vibration of a hard disk?

What kinds of sensors can be used to monitor the condition of a hard disk? We want to be able to detect when a hard disk is not operating correctly. Unexpected vibrations may be caused by spindle ...
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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
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, ...
4
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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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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
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 ...
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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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 ...
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 ...
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1answer
129 views

How can I estimate blocking window distance in an sCMOS sensor setup?

I am trying to establish an appropriate distance between a spectrograph output window and a CMOS sensor. The spectrograph creates a focused image on the CMOS sensor but I am trying to restrict 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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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 ...