| ??? 10/28/05 03:27 Modified: 10/28/05 03:28 Read: times |
#103064 - Gypsum block sensor Responding to: ???'s previous message |
I studied hydrogeology in college. We used a resistive gypsum block moisture sensor to measure soil moisture. The idea being that a direct measurement needs to be calibrated for the soil type, but the soil and a known/calibrated unit of material, in this case a gypsum block, will be in equilibrium with the soil. There's a company somehwere here in Austin that completely automates your sprinklers using a combination of local sensors, and local rainfall estimates polled off the Internet. I don't have much information on them, but I have read that it's popular with commercial landscaping here. From what I understand, to get a proper solution, you need tempurature history, a local estimate of rainfall, an estimate of evapotranspiration, as well as soil moisture. Further improvements can be had by sampling a pyranometer to measure total solar input... Anyhow... I've been out of college too long to have any sources of the sensors I used. Here's a couple quick soil moisture sensor links I found: http://www.microirrigationforum.com/new/sensors/ http://froogle.google.com/froogle?q...i=froogler Rob |
| Topic | Author | Date |
| soil dampness | 01/01/70 00:00 | |
| Conductivity? | 01/01/70 00:00 | |
| Conductivity | 01/01/70 00:00 | |
| addendum | 01/01/70 00:00 | |
| Nutsy idea? | 01/01/70 00:00 | |
| Configuration/calibration | 01/01/70 00:00 | |
| that would not be calibration | 01/01/70 00:00 | |
| humidity | 01/01/70 00:00 | |
| Water for a short while and compare | 01/01/70 00:00 | |
| Another idea | 01/01/70 00:00 | |
| Spatially Distributed Soil Measurements | 01/01/70 00:00 | |
| I needed that | 01/01/70 00:00 | |
| There is Yet Hope | 01/01/70 00:00 | |
| soil dampness | 01/01/70 00:00 | |
| Gypsum block sensor | 01/01/70 00:00 | |
Capacitance. | 01/01/70 00:00 |