Comments

Author Comment Last activity Moderation
Ag8n "It depends on the type of instrument. A narrower slot is normally used in a scanning type instrument. Many instruments these days are not scanning..." | Read more » 12 months ago
Ag8n "Most of what's been shown on TV has been satellite photos and local photos. For example, many photos were taken of China, as compared to a year pr..." | Read more » 12 months ago
Ag8n "73 DE mark " | Read more » about 1 year ago
Ag8n "Hi! Yes, SDR# is also my favorite software. I also have a V3, but I also have several of the older dongles. The older ones work ok, you just have ..." | Read more » about 1 year ago
Ag8n "I can only make a guess as to why they start at 0.2 ppm. With most analytical measurements, you want a ten to one signal to noise ratio to be sure..." | Read more » about 1 year ago
Ag8n "One inexpensive way to do that is with an rtlsdr dongle. You might want to check the rtlsdr subreddit. The dongles cost about $20. Thats assuming..." | Read more » about 1 year ago
Ag8n "Safety first. The problems you describe could be caused by a furnace not working correctly and generating carbon monoxide. Please get a carbon mo..." | Read more » about 1 year ago
Ag8n "Ok. If you are using the public labs spectrometer, it can be calibrated using the mercury lines in a compact florescent lamp (CFL). You could the..." | Read more » about 1 year ago
Ag8n "By the way, the CyAN app gets images from satellites! " | Read more » over 1 year ago
Ag8n "There is an APP from the EPA that allows for testing for cyanobacteria ( yes,this includes the bad algae). The app works on androids and is called..." | Read more » over 1 year ago
Ag8n "It's not as easy to do as it seems. Sunscreen blocks light in the uva and uvb . These are in the range of 360 nm to 200 nm. If you want to use t..." | Read more » over 1 year ago
Ag8n "There are a number of ways to test for this. But first, don't Use any method that brings you in contact with the algae. The exception is, if you a..." | Read more » over 1 year ago
Ag8n "Here in the lake Erie area, we are suffering from algae blooms. You can look up the problem. But especially in the western basin of lake Erie, t..." | Read more » over 1 year ago
Ag8n "This is a suggestion, only. I worked in the polymer industry for many years. This included rubber chemicals. One of the chemicals commonly used ..." | Read more » over 1 year ago
Ag8n "There are a number of emission spectra used with the spectrometer. As an example, the instrument is calibrated with the emission spectrum from a ..." | Read more » almost 2 years ago
Ag8n " Density is difficult to use. Many manufacturers use fillers like titanium dioxide as a filler. This will dramatically alter the density, dependin..." | Read more » about 2 years ago
Ag8n " With PVC, as the plastic degrades, you get more and more conjugated double bonds. Hate to get chemical, but the where the plastic absorbs starts ..." | Read more » about 2 years ago
Ag8n " Check the "baby legs" projects on microparticles. It will give some background. My own experience was in medical plastics industry. We routinely ..." | Read more » about 2 years ago
Ag8n " The green line on a compact florescent lamp is the one at 546 nm. There are a couple of calibration videos on the link @Warren gave that might h..." | Read more » about 2 years ago
Ag8n " The last I knew, it took calibration to set up the wavelength. One way of doing that was with a compact florescent lamp. But there may have been..." | Read more » about 2 years ago
Ag8n " Green is about 550 nm. Can you tell me the application the local people would like to use it for? Regards " | Read more » about 2 years ago
Ag8n " You usually measure visible spectrum in nanometers (nm). Resolution is measured the same way, but tested much differently. Can you give more inf..." | Read more » about 2 years ago
Ag8n " The only other thing to point out- all these calculations assume the particles are spheres. We had particle surface area measuring equipment. T..." | Read more » over 2 years ago
Ag8n " You might want to look into ANDalyze. They use a new technology based on DNA for heavy metal analysis in water samples. I'd need to see validati..." | Read more » over 2 years ago