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0answers
14 views

Is spectroscopic analysis of flowing air sensitive to the amount of matter or the flux?

I would like to like to go deeper in understanding the analytical and physical behaviour of air quality analysers. AQ analysers are merely based on spectroscopy (absorbance, fluorescence, ...
0
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0answers
14 views

Using a magnetometer in a sub-sea application, how to get a good magnetic bearing?

Mechanical engineer here, getting in over my head concerning magnetic sensors, electronics and the like :-) Quick situation description:For a work-application I am looking at using a MEMS based 3 ...
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3answers
34 views

A logic question on binary variables

I recently purchased some nightlights with sensors. The sensor will make sure the nightlight will only be tuned on in a dark environment. Let's assume the sensor is binary, ON or OFF. Here is the ...
0
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0answers
17 views

What position are the BOSEMs in LIGO measuring?

As I understand it, the quadruple pendulum of LIGO is also actively positioned, in addition to the seismic damping of the ISI. What I don't understand is: relative to what are the BOSEM sensors ...
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1answer
34 views

Orientation from acceleration?

I have an object that has a sensor attached on it. This sensor calculates the acceleration in all axis and angular acceleration in all axis(Keep the gravity force in mind). How can I get the Pitch, ...
1
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1answer
27 views

looking for a technique for conducting experiment [closed]

I have used a servomotor and a controlling circuit to produce oscillatory motion for an experiment that involves flapping of a tiny metal plate (~few mm) inside liquid. I could not be very successful ...
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0answers
39 views

What does this sentence about centripetal force mean

I'm reading this paper about sensors and I came across this paragraph: In this paper, our objective is to enhance the area coverage of WMSNs by 1- turning sensors to the correct orientation and 2-...
0
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1answer
58 views

Why should you be careful when you use a Hall effect probe to measure magnetic field?

Question: Why must you be careful with orientation when you use the hall effect probe to measure magnetic field? Background: In a recent Physics 2 lab, we used a magnetic field sensor which ...
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0answers
20 views

Transmittance of yellow light through blue substance

I am performing an experiment in which I flash an LED-light through a substance with different opacities and do voltage measurements over a photoresistor on the other side. When I decrease the ...
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0answers
20 views

What are the possible ways of detecting cell phones in some small space? [closed]

I guess i can somehow use the fact that cell phone is a source of electromagnetic waves. Considering the space of about 8m3 volume. What equipment setup can be used in order to count phones in a given ...
1
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1answer
68 views

How to sensor Jerk=$d^3{\bf r}/dt^3$, or higher derivatives (4th, 5th, 6th order) when applied in the equation of motion of a ballistic missile?

Given a 6th order differential equation of motion as usually used in ballastic missile dynamic models. What kind of sensors are usually used to measure Jerk, (or higher order derivatives in kinematics)...
0
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1answer
20 views

Bayer filter mosaic [closed]

Hello, How a yellow or any other color that is not rgb light, get throw the Bayer filter since only allows the RGB value to pass ?
0
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1answer
25 views

3D thermography setup

I want to know if its possible (yet) to sense the temperature throughout a given cylinder using non-invasive techniques? Such as ultrasonic or visual imaging etc. The temperature ranges from 250-450C. ...
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1answer
49 views

Speed Calculater [closed]

I want to make an android calculator which can calculate speed of a vehicle by using mobile sensors(accelerometer or GPS) i am interested to calculate it by using accelerometer instead of GPS is it ...
0
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0answers
11 views

Blocking Window Distance Estimation in sCMOS Sensor setup

I am trying to establish an appropriate distance between a spectrograph output window and a CMOS sensor. The spectrograph creates a focussed image on the CMOS sensor, but I need to block out some of ...
0
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0answers
114 views

How does a flex sensor work?

I was reading an article glove controlled hand using flex sensors. I know that a flex sensor is a type of variable resistor, but I want to know it's principle of operation, like does it work on ...
0
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1answer
60 views

Sitting to Standing Posture Transition Accelerometer Triaxial Data Explanation

I don't have a physics background. (I'm a Computer Science student) I have a waist-worn accelerometer provided by the school which is quite reliable. I've captured data of sitting still to standing ...
0
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1answer
58 views

Shack Hartmann lenslet array design

What is the relationship between the number of pixels on a CCD that are dedicated to a lenslet array and the number of pixels covered by the focal spot from one lenslet array on the CCD? Specifically ...
1
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1answer
28 views

Is it possible to determine when an accelerometer is in a vibrating state compared to a non-vibrating state?

I would like to know if so, how raw 3-axis accelerometer data could be analyzed and manipulated real-time to register periods of vibration. The device being used has a max sample rate of 62Hz (I ...
1
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1answer
37 views

What sizes are detectable from 1m using a fairly good cmos camera?

I haven't ordered a CMOS camera module yet, but I am planning to use it to detect a small object from ~1-1.5 meters. Just too be specific, say I am using the following CMOS camera (although if you ...
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2answers
365 views

Piezoelectric water flow detection

Can a piezoelectric sensor detect constant water flow, or just the moment when the water is turned on and off?
1
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1answer
84 views

How can the active area of a photodiode increased?

I use photo-diode VTB8440BH. To increase its active area I was thinking to put a lens in front the diode would enlarge its active area. What kind of lens would be beneficial one? I was thinking of a ...
3
votes
1answer
211 views

Can I catch a single photon with webcam's CMOS or CCD sensors?

I thought it would be nice to capturing single photons using a webcam's sensor due to simplicity. I've read that ccd and cmos sensors have a certain percent of quantum efficiency. What about webcam'...
2
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0answers
140 views

Circumference measurement using a capacitive sensor

I have a question which I hope someone in here can help me answer. Background: I’m building a device where I intend to use a stretchable capacitive sensor to define the radius change of an object. ...
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0answers
31 views

How can we detect the property of matter by using mechanical waves or IR or any other way

First of all, I am in high school[to tell that I don't know much physics]. And the second thing is that, I am not sure whether this question is specifically related to physics. What I want to ...
1
vote
1answer
299 views

Is one accelerometer enough for detecting tilt/orientation of a rigid body?

I’m not familiar with sensor hardware, and I don’t really know how an accelerometer works. But I do know that from a mathematical point of view, you wouldn’t be able to uniquely determine the ...
1
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3answers
229 views

Are some sources of electromagnetic radiation theoretically (or perhaps technically!) more challenging to detect than others?

In a previous question, I learned that in order to detect an object in space, what matters is how much electromagnetic radiation it is giving off, and what sources of EM radiation the sensor can pick ...
3
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1answer
427 views

Using infrared temperature sensor to measure water surface temperature

Can I use infrared temperature sensor (such as TS118-3) to measure water surface temperature? I'm afraid some effects such as reflection of infrared waves from water surface and blinking because of ...
0
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1answer
18 views

Active remote sensing to measure temperature?

I understand that objects give off EM emissions according to their temperature. But let's say this object is too far away to be measured via passive remote sensing. How can you measure the temperature ...
1
vote
1answer
213 views

Wavefront sensor specifications Shack-Hartmann

Why is the dynamic range of Shack-Hartmann wave-front sensors (As seen in the first image below) quoted in wavelengths and not in angles? I thought that one of the most important aspects of the ...
1
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0answers
34 views

The needs of photonic senseor for biomedical applications

I am doing a literature review on the topic mentioned in the title. When I write the review, I found myself a contradiction. Just want to listen to opinions from others :P Nowadays, the development ...
3
votes
2answers
477 views

Shack-Hartmann wavefront sensor concepts, pupil conjugate planes?

I am just starting to looking at the application of wavefront abberommtery to measure abberations in the human eye. I am confused over the pupil conjugate planes, do you use relay lenses to image the ...
2
votes
0answers
35 views

Quantum Efficiency Estimation

Might there be a way to do a rough estimate of the quantum efficiency of a photo-detector like a CCD or CMOS sensor based only on a picture taken with it? I've read papers and guides (like this one: ...
1
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1answer
62 views

Practical hardware question regarding optical source for an array of fiber bragg gratings [closed]

I have a single 1 meter array of 5 fiber bragg gratings that has FC/APC connectors on both ends. I will be embedding the array in a material and want to be able to do a quick check that the array is ...
0
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0answers
40 views

compressed/compressive sensing, sensor placement

Given: I have a beam fixed at one end and free at the other. It obviously results in vibrations due to the disturbances in the environment or when induced. This system can be represented using a ...
0
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1answer
203 views

Image K-Space and SNR

I am imaging a sample using CMOS camera. The pixel ratio is 6um x 6um and a total resolution {480, 752}. I understand that each pixel on the camera sensor is 6um x 6um in size (Have I understood this ...
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0answers
58 views

Modeling the probability of a photodiode measuring photons targets at a neighbor

In current digital cameras, sensors are arrays of photodiodes which "transform" photons energy to electrons. I am aware that the probability of a photon to generate an electron is modeled by a Poisson ...
1
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2answers
3k views

What is the difference between an accelerometer and an inclinometer?

When looking through papers for a controls project I found one that seemed to be referencing the fusing of sensor data from an inclinometer and an accelerometer. I always had thought that it was ...
2
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2answers
2k views

Why does a microwave oven affect other electronic devices

When I turn my microwave oven over the stove on, it will cause a motion sensor light in the hallway next to the kitchen to got off and on. This affect can be reproduced anytime. I did notice that ...
1
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0answers
71 views

Reorienting a sensor axes according to particle displacement directions

Consider a sensor which is located inside the solid substance. This sensor is capable of detecting the substance oscillations along each of the three axes (usually orthogonal, but generally, any non-...
8
votes
2answers
294 views

What is a capacitive screen sensing?

What should be a properties of a body so a contact with it can be detected by a capacitive touchscreen or a touchpad?