biologic sensing/systems research
Table of Contents
EEG
See research at: openeeg
Also: http://arstechnica.com/civis/viewtopic.php?f=26&t=178288
GSR
Galvanic Skin Response (also for plant sensing):
Several circuit designs were tested using DIY electrodes based on:
with copper tape and with aluminium tape. The simplest voltage divider circuit as detailed at:
was also tested and gave reasonable results when compared to more complex Wheatstone bridge style detailed below.
Kicad files:
This design uses OPA336 and follows:
http://courses.cit.cornell.edu/ee476/FinalProjects/s2006/hmm32_pjw32/index.html
Lie detector from Elektor (date?):
Links and overview: http://www.chris3000.com/archive/galvanic-skin-response/
Simple lie detector: http://www.hackcanada.com/ice3/wetware/lie_detector_circuit_2.html
GSR with DIY electrodes: http://extremenxt.com/gsr.htm
http://regexp.bjoern.org/archives/000187.html
http://web.media.mit.edu/~msung/VitaMon/vitamonschematics.htm
Plant sensing
With reference also to: http://lib.fo.am/plant_sensing
Electricity in plants
Scott, Bruce I. H., "Electricity in Plants", Scientific American, Oct. 1962, S. 107-115
at: http://www.r-j.de/literatur/electricity.pdf
"Electrical disturbances similar to the nerve impulse are associated with a number of plant life processes. It seems likely that these currents and fields somehow influence plant growth and development"
[p107]
The root of a bean shoot growing a weakly conductive medium, for example, is found to act as an electric generator sending tiny current into the medium and back through the root […]
The instrumentation must be highly sensitive, because only about a hunderdth of a microampere flows across a square millimeter of root surface […]
Without any stimulation the potential near the root starts to oscillate in a rhythmic fashion, the oscillations continuing for perhaps several hours […] The periods of oscillation for the roots we have studied are about five minutes.
[p110]
Note also: solutions of potassium chloride or sodium chloride
Karlsson, L., "Instrumentation for Measuring Biolectrical Signals in Plants", The Review of Scientific Instruments, Vol. 43, Nr. 3, March 1972, S. 458-463
at: http://www.r-j.de/literatur/karlsson1.pdf
Remote Biodynamic Sensing and the "Biogram" by Michael Theroux
at: http://www.borderlands.com/newstuff/research/rbs.htm
Detecting Biodynamic Signals by Michael Theroux
[referring to the work of L. George Lawrence inc. schematics]
at: http://www.borderlands.com/archives/arch/detectin.htm
L.George Lawrence: More Experiments in Electroculture
at: http://www.swtpc.com/mholley/PopularElectronics/Jun1971/PE_Jun1971.htm
- Elektrometer
Design following Elektor Mai 1977:
- Resistance
Measured with a Wheatstone bridge (combined with transistor, and op amp) based on the following design from Peter Lay: Experimente mit paranormalen Phänomenen):
Followed by LM358 inverting op-amp [two 1K resistors into + / - in and 1M poti for feedback/gain]
See also Psychotron [Elektor date?]:
- Impedance
"Impedanzänderungsdetektor", Elektor, Mai 1977, S. 28-30
Reproduced here: http://www.r-j.de/literatur/elektor.pdf
Could be constructed using Analog Devices AD5934 or 5933:
http://www.analog.com/en/rfif-components/direct-digital-synthesis-dds/ad5934/products/product.html
see also:
http://instruct1.cit.cornell.edu/courses/eceprojectsland/STUDENTPROJ/2005to2006/yz226/
Further general links
Date: 2010-07-13 19:32:22 BST
HTML generated by org-mode 6.31trans in emacs 23