Volume 1, Issue 3
The newsletter for Original Equipment Manufacturers of LMIDynavision - Winter 1996

Business News

Trade Secrets Lawsuit

Many of our customers and others in the industry have been asking about the status of our scanning technology "trade secrets" lawsuit against Newnes Machine Ltd. This is moving ahead with a court date now set for March 1997.

Our patent infringement case which was filed jointly with the National Research Council of Canada against Newnes Machinery Ltd. is also proceeding. Oral Discoveries are expected to begin in April of this year. In response to the lawsuit, Newnes Machine Ltd. had filed a challenge to the patent but the challenge was flatly rejected.

Product News

Announcing the L4 Log Scanner

The LMIDynavision L4 sensor will be introduced at the Portland sawmill show in March 1996. The L4 places four laser lines onto a log (or other material) at 1' increments to instantaneously measure 3D profiles. These profiles allow for immediate pre-optimization. Full profiles at 0.6" increments (at 300'/minute) can then be collected for full optimization. Multiple heads can be combined into one system to accommodate any length log or stem.

Unique to the L4 is the use of two cameras to observe the laser line from each side. This eliminates any shadowing from knots, bumps and gouges in the log that one camera would not be able to "see around". This improves accuracy and provides fail-safe redundant operation.

The combination of LMIDynavision reliability, ease of use, and pre-calibration, make the L4 a product with excellent value.

Also new: Log/Cant Scanners

The "Opcon 450 LMIDynavision" 3-D log scanner will also be introduced at the Portland sawmill show. The 450 will continuously measure 3-D profiles at 100 scans/second which makes it the fastest line scanner on the market. Multiple scan heads are combined around the log for full profiles in primary breakdown applications. New technology allows the scanners to work in normal mill lighting and environments without special scan frames or shrouding.

A LMIDynavision line based scanner, the L1, is also available with the FOV and range optimized for 3-D cant scanning applications.

More Business News

LMIDynavision in Europe

Our new European office in the Netherlands is now in full swing. This presence in Europe will strengthen our sales and support to the forest products industry for our full line of sensors, including the M6, M24 for high speed board and cant optimization, and the SPR-02 for thickness measurement.

Corporate Identity

You may have noticed that when you call our office now our company is identified as LMIDynavision rather than Dynamic Control Systems. Over the last five years our business focus has been on supplying LMIDynavision sensors for the forest industry and other industries for which we are becoming known and recognized worldwide.

Application Note: M6 Calibration Tables

The DSP cards use the calibration file values to linearize the raw signals from the scan head, resulting in high accuracy range readings. The values are produced on a precision bench during manufacturing and are individual to each scan head. The file name is the same as the scan head's serial number.

The calibration files are uploaded from disk to the DSP card during startup of the scanning system using the DVCSTART.BAT program (provided with the OEM software). The DVCSTART.BAT program refers to a table, \PROGRAMS\DATA\DVCSNTBL.ASC containing the number of scan heads, the serial numbers and the locations of the heads in the system. The DVCSNTBL.ASC table for an 8' wane up/down system typically looks like the following:

(Refer to section 5.6.1 of version V0.3 of the "M-Series M6 sensor OEM Documentation" for details on loading of the calibration tables.) The calibration files are contained in their own directory named by serial number. For example the calibration file for the M6 head with the serial number M0300101 would be located as \PROGRAMS\DATA\M0300101.CAL. If the DVCSNTABL.ASC table is not correct, either the wrong calibration file is loaded for a particular head or no calibration file is loaded for the head.

The wrong calibration file is loaded if the wrong serial number is entered in any location. The typical symptoms are range readings that are grossly out of range or vary drastically from spot to spot.

No calibration table is loaded for a particular head if an incorrect serial number is entered, or the correct serial number is entered but the calibration file does not exist. The load program will report an error at load time, and the load will not complete.

A calibration file also may not be loaded if the number of heads specified is fewer than the number of heads in the system. An example of this is when there are eight DSP cards in the system and the DVCSNTBL.ASC specifies only 7 DSP cards. The last card will not contain any calibration data and will not be initialized. The typical symptoms will be no data or random, out-of-range data.

If range readings appear to be random or grossly out of range, then the calibration table assignments in DVCSNTBL.ASC and the presence of the calibration table should be checked.

Internet Update

LMIDynavision is increasing its commitment to customer accessibility and service with our world wide web site on the ever expanding Internet at "". We also have an E-mail address. You can reach us at: E-mail allows you, our customers, to better communicate with us. Some of the useful functions will be to provide complete, update files, and to receive and respond to requests in a timely manner irrespective of time zones. We look forward to hearing from you.

Dynamic Control Systems has been in the business of providing industrial control products, displacement sensors and services since its inception in 1976.

Let our expertise in laser vision systems provide you with performance and reliability.

    205 - 7088 Venture Street
    Delta, British Columbia
    Canada, V4G 1H5
    Tel: 604.940.0141
    Fax: 604.940.0793

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