National R&D Laboratory Application Case Study - Data Acquisition Laser

National Research & Development Laboratory Applications

High-Power Laser Lamp Array Tester

Customer Case

The customer is building a tester for an array of high-power laser lamps. These lamps draw 35,000 Amps of current. The test involves sending a control signal to the laser lamp and measuring the time between the signal and the switching on of the lamp (which is picked up by a photodiode). This time is representative of the quality of the lamp.

The customer currently has a 16-channel system, and would like to explore increasing the number of channels. In the customer's present system, eight CompuScope 512 cards are installed in a GaGePC using a PIA720 chassis. The customer wants to increase the number of channels, but with a PIA720 chassis, this customer has already reached the maximum of eight cards in his system.

Below is a representation of the customer's setup (overhead view):

Laser Lamp Array Tester Chassis

GaGe Case Solution

Let us first calculate how many data points are needed to sample the entire revolution in on-board memory at different rates:

Number of Points = Record Length (in sec) * Sample Rate (in Hz)
At 10 MSPS rate, Number of points = 83 ms * 10 MHz = 830 Kilosamples
At 25 MSPS rate, Number of points = 83 ms * 25 MHz = 2,075,000 samples = 1.978 Megasamples

There are two solutions for this situation:

Option #1: 32 channels with 5 MSPS simultaneous sampling

This option can be represented by the following diagram (overhead view):

Laser Lamp Array Tester Chassis Option 1

In this system, two sets of eight CompuScope cards are installed in a 20-slot ISA backplane GaGePC. A special two-level chassis is used, in which the 20-slot backplane is on the upper level, and the drive bays and power supply are housed on the lower level. The special power supply is a combination of a CompuPower 100 and CompuPower 200, ensuring the added power required in this system. The two groups of eight CompuScope cards are internally linked via a custom signal conditioner, to ensure synchronization of the clocks and triggering.

Option #2: 64 channels, with 5 MSPS simultaneous sampling

This option can be represented by the following diagram (overhead view):

Laser Lamp Array Tester Chassis Option 2

Option #2 combines two of the Option #1 systems, except that the second GaGePC has no CPU. A Bus Expansion Kit connects the two systems, so that the cards in Chassis #2 behave as though they were on the same bus as the cards in Chassis #1. Again, clock and trigger are synchronized internally within each system, but there is also an external clock and trigger synchronization between the two systems.

Both of these options are very effective ways of providing a very high number of channels which function together as one system. What is more, GaGe provides a complete turnkey system with all the CompuScope cards installed, synchronized and ready to run.

This type of solution is perfect not only for this customer's particular application of testing high-power laser lamps, but also for other applications requiring a large number of synchronized channels, such as Engine Analysis.

GaGe Case Recommended Products

Option #1:

  • 2 x 8 Multi-Card CompuScope 512 - 12-bit, 5 MSPS Cards for the ISA Bus
  • GaGePC in Special Chassis
  • Custom Power Supply
  • Internal Clock In to Clock Out Modification
  • Internal Trigger In to Trigger Out Modification

Option #2:

  • 4 x 8 Multi-Card CompuScope 512 - 12-bit, 5 MSPS Cards for the ISA Bus
  • 2 x GaGePC in Special Chassis (one without CPU)
  • ISA Bus Expansion Kit
  • Custom Power Supply
  • Internal Clock In to Clock Out Modification
  • Internal Trigger In to Trigger Out Modification
  • External Clock In to Clock Out Modification
  • External Trigger In to Trigger Out Modification

Research & Development Application Request

We encourage you to contact us and discuss your research & development application in more detail with our engineering team. GaGe can provide tailored custom data acquisition hardware and software solutions to meet specific application requirements:

Submit Application Request