PPM-MarkIII for underwater surveys

HI,
This is few PIX of two markIVB systems built for underwater surveys. The first one has an LCD+keypad to be able to make underground as well as underwater surveys and the second one is a 'blind' configuration. Both have a USB connection to an operator interface on a PC.
You can see the two boxes closed, one box opened and two pix with the details of each board.
Inside the box with its transparent cover, you can see the GPS module at the upper left of the picture.

The last picture is a screen dump of the PC program while reviewing one GPS-based grid file.

Willy

Posted on: February 23, 2012, 10:59:43 AM

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The fish posted before is currently being tested at sea in Australia and it looks like it correctly behave in the water.

The pictures of this posting are showing :
1. Our last prototype version. It has a cone made of solid aluminum and a VERY solid but adjustable cable attachment. It just needs a pair of fins to be attached to its tail.
2. A fish built by one of our American client based on our design.


Note that all these fishes are designed to carry our sealed sensor container, they are not themselves water-tight.

Willy

Posted on: March 26, 2012, 04:18:43 AM

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Hi,

We have now implemented a new mode of GPS plot in our PPM Utility program.
Look at these two alternate methods.
The GPS fixes are plotted in XYZ mode using one of two possible options according to the checkmark 'Draw Circles':
1. Hollow circles whose diameter depends on the field gradient and color depends on the sign of the gradient, Green for positive, red for negative values.
2. Circles of constant diameter filled with a rainbow-type color scale. Hot colors correspond to positive field gradients, cold colors correspond to negative field gradients. Light green shows field gradients close to 0.
In both cases, field gradients with absolute value is less than the Gradient Threshold parameter ($TG) will be displayed with very small circles. See the last picture and compare with the previous ones.

The GPS plot is drawn by default with the maximum scale ratio and panning to completely enclose the full survey grid but, the operator can override this by manually panning and zooming.

Willy

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Hi all,
It's now a long time that we posted any comment on this forum.
However, the normal sales and support activities related to our PPM MarkIVC are going on.
The only sizable info we could report at thispoint about the underwater sensor is that we have improved it one step further by using an hermaphroditic panel connector used in the professional diving industry (

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). It is rated for a depth of 10000ft.
For underground surveys, the weight of the sensor is an important factor. Thus, We had switched for coil winding using aluminum wire which gives a considerable weight advantage.
However, the minus side of that is that this type of wire has a higher electrical resistance and thus, gives less polarization current for the same power voltage.
For the underwater surveys, the weight is not important (it is even better to get an heavier sensor), thus, we have switched back to the standard copper wire.

We have also very much upgraded and improved the PPM Utility program for both underwater and underground surveys in real-time operation and in post-processing.
This program can now accept the NMEA data stream from an external GPS replacing the integrated GPS.
It also can complement the GPS data from the integrated GPS with the depth data (as NMEA sentences) coming from a sonar and plot it along with the PPM data.
We have upgraded the generation of survey paths and waypoints including the automatic generation of full survey routes made of parallel survey lines based on a reference waypoint.
For the post-processing of grid-shaped survey files, we are now able to interpolate the readings and generate/display on this program 2D contoured, colored grids (exactly as Surfer does it).
These grids can then be scanned by the program to locate and mark potential targets as monopoles and dipoles with a measurement of their height and surface.

Willy

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