Questions tagged [sensors]

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1answer
37 views

Deriving the First order response of a sensor

I'm trying to derive the first order response of a sensor with step input. However, I'm stuck at step just before conducting the Laplace transform. In the following image, how is the left side equal ...
5
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1answer
328 views

How can I detect black spots?

I am researching about ways to continuously determine black spots (size 50+ micron) in our product stream. This stream consists of imperfect spherical polymer beads (size 3 mm) of different materials (...
1
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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 ...
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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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-...
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1answer
137 views

Is the pressure of the gas identical to the static pressure of the liquid in the diagram?

In my application the liquid would be tapped from a fast-varying flowrate, and I want to measure the static pressure change during this by measuring the air pressure above it. Will this work?
1
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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 ...
-2
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1answer
136 views

Accurately measure the distance from chest to back

I want to measure the distance between the back of a human body, and the chest. This is denoted in the image below, where Point A is the back and Point B is the chest: I do not wish to measure the ...
0
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2answers
47 views

Determining change of object over time ( diameter )

I am currently attempting to solve the following problem. Say that I have an object that can expand and contract, given some external force. What I want to know is how much it has expanded, or ...
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
287 views

How to measure above 100K RPM?

I'm trying to measure the rotational speed of a turbocharger, but the laser tachometer I have can only measure up to 99,999 RPM and it isn't enough (display starts to output letters) and devices that ...
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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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 ...
0
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2answers
732 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 ...
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 ...
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 ...
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. ...
4
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4answers
742 views

Precision measurement of liquid levels

How can I measure changes in liquid level of the order of 50 μm? The tank is cylindrical with a radius of about 12.5 mm and a total volume of about 45 ml. The fluid is water-based. The technique ...
1
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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 ...
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 ...
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0answers
91 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?
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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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 ...
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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 ...
1
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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 ...
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 ...
0
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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..
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 ...
1
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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 ...
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 ...
0
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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 ...
2
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1answer
404 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?
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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 ...
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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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 ...
-1
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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 ...
0
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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 ...
0
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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 ...
3
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0answers
157 views

How to tune the radial mode vibration of a PZT disc transducer?

I am trying to create a set-up where I can radially vibrate a 1x1 cm sample using a piezoelectric disc transducer. I know that at the $f_{min}$ of a PZT transducer, for the disc geometry, there is a ...
0
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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? ...
3
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1answer
193 views

Pressure sensors with best precision

Measuring pressures have many different applications which require proper encapsulating of the sensors, but at the core there is a limited amount of techniques. To my understanding, the two leading ...
4
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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 ...
28
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10answers
6k views

How to quantify martial arts strikes?

Subtitled: Ah, strong am I with the Force, but how do I measure it? With all due apologies for paraphrasing Yoda, I am trying to measure a force. Fortunately, it's an easier force to measure than ...
1
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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 ...