Thursday, April 26, 2018

24-hour Photometer for NearSys Station

I ran both the 7-channel LED photometer and a UV-B photometer all day April 25th. This time, there was no unexpected blue spike at around sunrise.

It can be seen there was an event at 12:00 and 15:30 that briefly dimmed the solar flux. It can also be seen that I need to align the charts of the two datasets a little more carefully.

Results from the LED Photometer

Results from the AdaFruit UV-B Photometer

Monday, April 23, 2018

Garden Soil Temperature

I ran an experiment to see how my garden's temperature varies. To do this, I buried two sets of dataloggers and shot several readings with my Seek Reveal thermal imager.
At the top is the munched dual temperature logger and bottom right is the unmulched logger. Both have LM335 temperature sensors buried 2" and 5" deep.

The Seek Reveal shows there is a wide variation in surface temperatures because if the play of sunlight and shadows on an uneven soil surface. The imager is only measuring the surface temperature, not the temperature below the surface.

The Seek Reveal shows just how strongly undulations affect the surface temperature.

The below surface temperatures show what I expected. The deeper temperature doesn't experience as large of a temperature swing. Also, mulching reduces the magnitude of the temperature swing that soil experiences.

Soil that's not covered by 2" of mulch experienced a stronger temperature swing over 22 hours than did munched soil. Also, munched soil didn't experience of a temperature difference between 2" and 5" deep.

24 Hour Photometer at NearSys Station, 22 April 2018

After posting photometer last night, I got to thinking that I had no good way to compare data from week to week. I think however, that collecting for 24 hours get give me this capability. So I'm posting my first 24 hour photometer run.

I need to fix the red LED and add ultraviolet data (I am running a test with a BalloonSat Mini flight computer - it won't father as much data as my LED Photometer).

Interesting, blue light spikes in intensity at sunrise. I need to see if this is a typical event.

Sunday, April 22, 2018

24 Hour Temperature and Relative Humidity at NearSys Station, 21 April 2018

Data was collected using the Amprobe 200. Without realizing the issue, it was prigrammed for a maximum temperature of 100 deg F. The resulting chart illustrates why the maximums need to be removed from the datalogger during programming and why it needs its sunshield. The air temperature did not exceed 100 degs on Saturday.

All Sky Photometer for NearSys Station, 21 April 2018

The sky was clear all day at NearSys Station.

UAVSonde Data for NearSys Station, 20 April 2018

The UAVSonde collected data at 8:30 PM.

The ground temperature was 67.0 deg F and the relative humidity was 24.7%. At FL4 (400 feet AGL) the temperature was 66.9 deg F and the relative humidity was 19.1%.

The visibility was determined to be in excess of 50 miles.

Looking east

Looking north

Looking south

Looking east

Sunday, April 15, 2018

All Sky Photometer for NearSys Station, 15 April 2018

We had a good mix of sunny and cloudy skies at NearSys Station today. That is apparent in the all sky photometer chart.