How to input 1d waveform array into lock in amplifier
I have a LabView application that I need to modify to include a lock in amplifier. The application uses a DAQ card to repeatedly capture a 0.1s sample of two signals (one signal, one reference) during a laboratory test. Previously the measurement was being made by the basic RMS module to record the VRMS of the signal, and the reference ignored. However, the measurements I am now performing are at a much lower S:N and so I'd like to use a simple LIA from the NI kit.
I am happy (I think) with the setup of the LIA but I'm struggling to understand the input data requirement. It has to be a 2D array, with the reference signal identifited. However, the output from the part of the utility that captures the waveform is a 1D array of waveform. Could someone advise me on how to convert from the 1D array of waveform to a 2D array suitable for input to the LIA?
As you might have guessed I'm a newbie to LabView, I'm trying to modify an application designed and assembled by a former colleague, so I'd appreciate simple suggestions!
TIA.
Solved!
Go to Solution.
I tried that but fell at the first hurdle. I've attached the error message that I got. It refers to the issue being due to connecting the type Waveform (DBL) to a 1D array of double. Apologies if I'm missing something simple here, software is not my strong point.
I'm a bit confused as to why the LIA (or its subVI's) require a 2D array. I would have thought, from experience with hardware LIA (5210's etc) that the VI's would want a waveform to process.
Each entry in the TDMS file is a 0.1s capture of an ~800Hz sine wave, along with the reference signal from the chopper that generated the modulation. I'm a bit confused as to how this data gets represented in a 2D array for the LIA. I assume that the waveform is broken into an array of amplitude versus time for each sample and that each sample is then indexed in the 2D array?
Anyway, all help greatly appreciated.
Thanks.
Message Edited by Ringding on 03-27-2009 12:25 PM
Attachments:
connection error.jpg 84 KB
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System.out.println("Total value: " + "$" + dblTotalValueB);
System.out.println("!--------------------------------------------------");
System.out.println("!------------------Warehouse C:--------------------");
System.out.println("!--------------------------------------------------");
//Display Items in warehouse C.
System.out.println(warehouseCList);
//Total items in warehouse C.
System.out.println("Total items: " + intWarehouseCItemCount);
//Display total value of warehouse C.
System.out.println("Total value: " + "$" + dblTotalValueC);
/**Display a help message.*/
private void displayHelp()
System.out.println("!--------------------------------");
System.out.println("! General Help:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'help' display this help message.");
System.out.println("!'Q!' quit this program.");
System.out.println("!--------------------------------");
System.out.println("! Input File Specific Commands:");
System.out.println("!--------------------------------");
System.out.println("! ");
System.out.println("!'F' <name> type F followed by the name of the " +
"file to be used for input.");
System.out.println("!---------------------------------------");
System.out.println("! Input From Keyboard Specific Commands:");
System.out.println("!---------------------------------------");
System.out.println("! ");
System.out.println("!'K' <number> type K followed by the number of " +
"items that will be added. ");
System.out.println("! ");
}Program file:
public class InventoryProg
public static void main(String[] args)
//Create a new Inventory object.
Inventory test = new Inventory();
//Execute the command interpreter.
test.cmdInterpreter();
}Right now I am stuck on this and I cannot progress any further until I figure out how to input the data in the text file back into a arraylist.
Thanks in advance.Thanks but I figured it out. Heres a sample of the code i used to solve my problem:
try
//Warehouse A BufferedReader.
BufferedReader inA = new BufferedReader(new FileReader(inputFileWarehouseA));
//Warehouse B BufferedReader.
BufferedReader inB = new BufferedReader(new FileReader(inputFileWarehouseB));
//Warehouse C BufferedReader.
BufferedReader inC = new BufferedReader(new FileReader(inputFileWarehouseC));
//Warehouse details BufferedReader.
BufferedReader inDetails = new BufferedReader(new FileReader(inputFileDetails));
//Will hold values in warehouse arraylists.
String lineA = null;
String lineB = null;
String lineC = null;
//Will hold the details of each warehouse.
String line1 = null;
String line2 = null;
String line3 = null;
String line4 = null;
String line5 = null;
String line6 = null;
//Get the item count and total value for each warehouse.
while(inDetails.readLine() != null)
line1 = inDetails.readLine();
line2 = inDetails.readLine();
line3 = inDetails.readLine();
line4 = inDetails.readLine();
line5 = inDetails.readLine();
line6 = inDetails.readLine();
/**Assign the item count and total value to warehouse A.*/
//Cast.
int intLine1 = Integer.valueOf(line1).intValue();
double dblLine2 = Double.valueOf(line2).doubleValue();
//Assign the values.
this.intWarehouseAItemCount = intLine1;
this.dblTotalValueA = dblLine2;
/**Assign the item count and total value to warehouse B.*/
//Cast.
int intLine3 = Integer.valueOf(line3).intValue();
double dblLine4 = Double.valueOf(line4).doubleValue();
//Assign the values.
this.intWarehouseBItemCount = intLine3;
this.dblTotalValueB = dblLine4;
/**Assign the item count and total value to warehouse C.*/
//Cast.
int intLine5 = Integer.valueOf(line5).intValue();
double dblLine6 = Double.valueOf(line6).doubleValue();
//Assign the values.
this.intWarehouseCItemCount = intLine5;
this.dblTotalValueC = dblLine6;
/**Put the items back into the warehouses arraylists. */
//Add items to warehouse A.
while((lineA = inA.readLine()) != null)
warehouseAList.add(lineA);
//Add items to warehouse B.
while((lineB = inB.readLine()) != null)
warehouseBList.add(lineB);
//Add items to warehouse C.
while((lineC = inC.readLine()) != null)
warehouseCList.add(lineC);
}(this isn't the whole try statement its pretty long) -
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