{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/api-evangelist/thermo-fisher-scientific/blob/main/json-schema/thermo-fisher-measurement-schema.json",
  "title": "Thermo Fisher NanoDrop Measurement",
  "description": "A UV-Vis spectrophotometric measurement result from the Thermo Scientific NanoDrop Ultra instrument.",
  "type": "object",
  "required": ["measurement_id", "method", "timestamp"],
  "properties": {
    "measurement_id": {
      "type": "string",
      "description": "Unique measurement identifier."
    },
    "sample_id": {
      "type": "string",
      "description": "Sample identifier associated with this measurement."
    },
    "sample_name": {
      "type": "string",
      "description": "Sample display name."
    },
    "method": {
      "type": "string",
      "description": "Measurement method used (e.g., DNA-50, Protein A280, Custom)."
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "Date and time the measurement was performed."
    },
    "operator": {
      "type": "string",
      "description": "Operator who performed the measurement."
    },
    "concentration": {
      "type": "number",
      "minimum": 0,
      "description": "Calculated concentration in ng/µL or µg/mL."
    },
    "unit": {
      "type": "string",
      "description": "Concentration unit (ng/µL, µg/mL, etc.)."
    },
    "a260": {
      "type": "number",
      "minimum": 0,
      "description": "Absorbance at 260 nm."
    },
    "a280": {
      "type": "number",
      "minimum": 0,
      "description": "Absorbance at 280 nm."
    },
    "a260_a280_ratio": {
      "type": "number",
      "minimum": 0,
      "description": "A260/A280 purity ratio. ~1.8 indicates pure DNA; ~2.0 indicates pure RNA."
    },
    "a260_a230_ratio": {
      "type": "number",
      "minimum": 0,
      "description": "A260/A230 purity ratio. Values between 2.0-2.2 indicate high purity."
    },
    "spectrum": {
      "type": "array",
      "description": "Full UV-Vis absorbance spectrum.",
      "items": {
        "type": "object",
        "properties": {
          "wavelength": {
            "type": "number",
            "description": "Wavelength in nm."
          },
          "absorbance": {
            "type": "number",
            "description": "Absorbance value."
          }
        }
      }
    }
  }
}