Data sections

Each LIBS observation record stores one spectral shot — a 2491-element emission intensity array covering 178–427 nm — linked to a sample and an observation log. LIBS values are raw photon counts (intensity), not reflectance; values are typically in the thousands. Multiple replicates per sample are common.

Prerequisites

Notebook cell

In load_ai4sh_spectral_data.ipynb, the Manage LIBS observation cell runs:

job_file = 'import_data/LIBS_spectra/job_libs_observation.json'

structured_process_D, scheme_params_D = Initiate_process(notebook_path, scheme_file, job_file)

if structured_process_D is not None:
    Run_process(structured_process_D, scheme_params_D)

Job file

Path: ./ai4sh/import_data/LIBS_spectra/job_libs_observation.json

{
  "process": {
    "job_folder": "import_data/LIBS_spectra/observation",
    "process_sub_folder": "process",
    "pilot_file": "xspatula_add_observation_pilot.txt"
  }
}

Process file example

Path: ./ai4sh/import_data/LIBS_spectra/observation/process/ai4sh_ch_lens_2026@libs_ds2c_lens@0-5_a_0_none_20260213_observation.json

{
  "process": [
    {
      "process": "manage_observation",
      "parameters": {
        "observation_log_id__observation_log_name": "ai4sh_ch_lens_2026@libs_ds2c",
        "sample_id__sample_name": "lens@0-5",
        "provision_id__provision_name": "foss micral",
        "subsample": "a",
        "replicate": 0,
        "observation_date": 20260213,
        "@spectra_array": [6339.48, 6235.74, 6255.93, 6381.71]
      }
    }
  ]
}

492 process files — one per individual shot. The @spectra_array contains 2491 intensity values; the example shows the first 4 (at ~178 nm).

Parameters

Parameter Description
observation_log_id__observation_log_name FK lookup: parent observation log
sample_id__sample_name FK lookup: sample record
provision_id__provision_name FK lookup: foss micral
subsample Sub-sample identifier (e.g. a)
replicate Shot replicate number (integer, starting at 0)
observation_date Date of analysis as integer (YYYYMMDD)
@spectra_array Emission intensity array — 2491 values, 178–427 nm, ascending wavelength

Unlike the reflectance instruments, LIBS observations do not include a provision_serial_nr_id field.

All spectral data loaded

All four instruments are now loaded. All spectral observations are stored in the AI4SH database linked to their samples, observation logs, and spectrometer records. To load all data types in a single notebook, see Load all data.

Updated: