Hot answers tagged

2

I think you are right to rule out catalytical and electrochemical sensors, as these likely require oxygen, though I'd confirm this with a manufacturer. As a proxy for hydrogen, use density. As a first order approximation, a mix of 99% N2 and 1% H2 will have 0.99 x the density of N2. The first density measurement device I found (Schwing PMT, site only german ...


2

My experience is there is no particular standards for saving sensor data. Usually one just picks a format that is useful to the task at hand. If, for instance one wants to do post processing analysis in Excel then CSV formatted text files work pretty well. If you do use CSV, then just save numerical values. Don't add text indicating units to each number as ...


2

Searching for "fibre-optic strain measurement" yields plenty of results. One from HBM states: To create the actual strain sensor, the optical fiber is inscribed during production with a so-called Fiber Bragg Grating (FBG). This is basically a pattern of material interferences, which reflects the light differently from the rest of the fiber. For better ...


2

Ultra sound sensors could be used, you know the general size of all available container sizes and the material it is made of create a lookup table for such empty containers returning sounds. sound returned from a loaded truck will be different. It will not give you mg though.


1

This is a challenging measurement. In my opinion best done with a very good balance. Fully shielded from thermals and vibration, obviously. Use a small container with small opening diameter to limit evap to what will hopefully be under 10% of the final measurement (and we will correct for it more later). A clean 2mL glass bottle is good. Fill bottle halfway, ...


1

If it says 5V power it up with 5V. The fact that the LED is glowing does not necessarily mean that the sensor is operating as it should. You can only safely say that the LED is receiving enough voltage to operate (nothing more nothing less), unless you have the manual of the sensor that says otherwise (e.g. if the greenlight on the LED is indicative of ...


1

Are you asking how a scanning LIDAR physically works? Or just the format in which it outputs data? I feel that you're overthinking something. Because the raw data that is obtained by a LIDAR is the angle at which the beam is pointing and the distance that was measured when pointing in that direction. It is just a rangefinder at heart after all and can only ...


1

As far as I can see- I think your error in measuring $\delta L$ should be zero. I mean apart from the increased friction, that might hinder the movement a bit, I don't think that you should get any error in the measurement of length.


1

Usually, thermostats work with the principle of thermal expansion. There is a bimetallic strip that expands with heat and the connection is broken. if you set it up so, that the expansion springs out of place (sort of like when you bend stick to use it as a launcher) , then you can reset the thermostat by mechanically "arming" it. There are two ...


1

Strain is defined as a relative displacement. Measuring strain is measuring movement of a material, basically a tape measure on a very small scale. So a laser can ostensibly be used to detect how far something moves. Googling "measuring strain with lasers" seems to give a representative set of info.


1

Doing more research i have found a very good database on H2 sensors at (> 400 entries!!): https://netzwerke.bam.de/Netzwerke/Content/EN/Downloads/h2sense-database.pdf It includes promising canditates for my application. Seems the prefered type of sensor is a thermal conductivy based one. At current time more detailed evaluation of the options including ...


1

Are you making a corrosion sensor or a hydrogen sensor ? Corrosion sensors ( corrosion probes) ,based on metal loss have been around for over 50 years. And hydrogen is a special problem , strongly dependent on the diffusion of the hydrogen. Steel is relatively "transparent" to hydrogen above 400 F. And the solubility below 400 F depends on the steel ...


1

You can change the type and/or order of the lowpas filter. Your current filter has a -3 dB reduction at 15 rad/s (~2.4 Hz) and decreases with a -1 slope every decade. This means that at 150 rad/s (~24 Hz) the amplification is still -10 dB (factor 0.1), which is not that much. Therefore you could change the order of the filter, e.g. $$F(s)=\frac{1}{(\tau\...


1

For multiple "spots" on a road, train an overhead, high-speed (maybe), sensitive, thermal imaging camera on the road. All else being equal, higher pressure from a vehicle passing over a "spot" will cause it to heat up more from compression, deformation, and destruction. The material should be briefly hotter along the "heat tire ...


1

Measure the deflection of the suspension springs in the trailer. The greater the load, the lower the trailer will sit. You prepare a calibration chart using known weights loaded on a given brand of trailer and repeat for the most popular brands. Then you can detect how heavily the trailer is loaded by how much closer to the ground it is than it would be if ...


Only top voted, non community-wiki answers of a minimum length are eligible