29.1.13 DasRaw
| Topic Version | 1 | Published | 12/09/2016 | ||
| For Standard | PRODML v2.0 | ||||
| Type: | Group | Stereotype: | «XSDcomplexType» | ||
This object contains the attributes of raw data acquired by the DAS measurement instrument. This includes the raw data unit, the location of the raw data acquired along the fiber optical path, and information about times and (optional) triggers. Note that the actual raw data samples, times and trigger times arrays are not present in the XML files but only in the HDF5 files because of their size. The XML files only contain references to locate the corresponding HDF files, which contain the actual raw samples, times, and (optional) trigger times.
|
Name |
Type |
Notes |
|---|---|---|
|
NumberOfLoci |
NonNegativeLong |
The total number of ‘loci’ (acoustic sample points) acquired by the measurement instrument in a single ‘scan’ of the fiber. |
|
OutputDataRate |
FrequencyMeasure |
The rate at which the spectra data is provided for all ‘loci’ (spatial samples). This is typically equal to the interrogation rate/pulse rate of the DAS measurement system or an integer fraction thereof. This attribute is optional in the Raw Data object. If present, it overrides the Acquisition PulseRate. If not present, then OutputDataRate is assumed equal to the PulseRate. |
|
RawData |
DasRawData |
A DAS array object containing the raw DAS data. |
|
RawDataTime |
DasTimeArray |
A DAS array object containing the sample times corresponding to a single ‘scan’ of the fiber. In a single ‘scan’, the DAS measurement system acquires raw data samples for all the loci specified by StartLocusIndex . The ‘scan’ frequency is equal to the DAS Acquisition Pulse Rate. |
|
RawDataTriggerTime |
DasTimeArray |
A DAS array object containing the times of the triggers in a triggered measurement. Multiple times may be stored to indicate multiple triggers within a single DAS raw data recording. This array contains only valid data if TriggeredMeasurement is set to ‘true’ in DAS Acquisition. |
|
RawDataUnit |
String64 |
Data unit for the DAS measurement instrument. |
|
RawDescription |
String2000 |
Free format description of the raw DAS data acquired. |
|
RawIndex |
NonNegativeLong |
The nth count of this Raw instance in the Acquisition. Recommended if there is more than 1 Raw instance in this Acquisition. This index corresponds to the Raw array number in the H5 file. |
|
StartLocusIndex |
NonNegativeLong |
The first ‘locus’ acquired by the interrogator unit. Where ‘Locus Index 0’ is the acoustic sample point at the connector of the measurement instrument. |
|
uuid |
UuidString |
A universally unique identifier (UUID) for an instance of raw DAS data. |
|
Association |
Notes |
|---|---|
|
From: DasRaw.Custom 0..1To: DasCustom Association |
|
|
From: DasAcquisition.Raw 0..*To: DasRaw Association |