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Sensit Home
Last update March 16, 2008: Model
H11-LIN Radial symmetry
calibration now available with new sensor orders.
The new radial response calibrator shown below uses a
standard sensor piezoelectric crystal as a kinetic energy source
providing matched mechanical coupling characteristics. A stepper motor
provides pinpoint positioning for data down to one degree increments
perpendicular to the crystal surface.

Data below is averaged to emulate the natural averaging
of particles impacting the sector facing the wind. The wide natural
angle of exposure in the wind helps smooth the otherwise rather rough
characteristic response.
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Above is an actual (10 degree) radial symmetry
calibration showing an example of a typical response pattern for the new
Model H11-LIN sensor. This test requires the PHA output standard
on the new Model H11-LIN sensor and can not easily be performed on
earlier models.
THE NEW SENSOR:
Model H11-LIN
Sensit has replaced the long standard model H11B & C with an
enhanced version of the saltation sensor. The new model provides the standard data outputs of KE
(kinetic energy) and PC (particle counts) compatible with the original
Sensit(tm) model H11B sensor. The new H11-LIN model now includes
a detailed energy per impact output (PHA data) providing the
energy spectrum as a result of every individual particle impact. Note: A
pulse height analyzer (PHA) is required. Sensit is working a a PHA
module to acquire this large amount of data. Target date: 4th
quarter 2008.
Technical information document: click
(New
Wiring Diagram - March 16, 2008)
Wiring Color Code
New Model Number -
H11-LIN
Outputs
 | (brown) KE (pseudo mass flux) - pulse |
 | (white) PC (particle counts) - pulse |
Pulse Energy Outputs
(NEW)
 | (blue) PHA (energy) - variable pulse height |
 | (green) GAIN - 1X, 10X. |
Power
 | (red) Power + 12VDC @ 70ma |
 | (black) Ground |
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Wind Eroding Mass Sensor
NEW: The PHA (pulse height analysis) data output is a
square wave pulse (width: 48uS) whose height varies with the impact energy transferred
(total transferred per impact, not just peak) of each particle impact.
This data provides particle energy spectrum. A pulse
height analyzer / data acquisition module is expected to be available
4th quarter 2008.
This new "per particle" energy data will be acquired by
the pulse
height analyzer module. Data from this module can be read into any
computer via RS-232. PHA data is structured as an XY array where
the X-axis represents energy and the Y-axis represents the number of
impacts at that energy. The future Sensit PHA module is expected to
acquire up to 1000 complete spectrum throughout an erosion event for
size separation analysis etc.
Model H12-LIN improvements:

Model H11B (No longer available) |