3.3.1.48. NXsensor¶
Status:
base class, extends NXobject
Description:
A sensor used to monitor an external condition
The condition itself is described in NXenvironment.
Symbols:
No symbol table
- Groups cited:
NXgeometry, NXlog, NXoff_geometry, NXorientation, NXtransformations
Structure:
@default: (optional) NX_CHAR
Declares which child group contains a path leading to a NXdata group.
It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.
model: (optional) NX_CHAR
Sensor identification code/model number
name: (optional) NX_CHAR
Name for the sensor
short_name: (optional) NX_CHAR
Short name of sensor used e.g. on monitor display program
attached_to: (optional) NX_CHAR
where sensor is attached to (“sample” | “can”)
measurement: (optional) NX_CHAR
name for measured signal
Any of these values:
temperature
pH
magnetic_field
electric_field
conductivity
resistance
voltage
pressure
flow
stress
strain
shear
surface_pressuretype: (optional) NX_CHAR
The type of hardware used for the measurement. Examples (suggestions but not restrictions):
- Temperature:
J | K | T | E | R | S | Pt100 | Rh/Fe
- pH:
Hg/Hg2Cl2 | Ag/AgCl | ISFET
- Ion selective electrode:
specify species; e.g. Ca2+
- Magnetic field:
Hall
- Surface pressure:
wilhelmy plate
run_control: (optional) NX_BOOLEAN
Is data collection controlled or synchronised to this quantity: 1=no, 0=to “value”, 1=to “value_deriv1”, etc.
high_trip_value: (optional) NX_FLOAT {units=NX_ANY}
Upper control bound of sensor reading if using run_control
low_trip_value: (optional) NX_FLOAT {units=NX_ANY}
Lower control bound of sensor reading if using run_control
value: (optional) NX_FLOAT (Rank: 1, Dimensions: [n]) {units=NX_ANY}
nominal setpoint or average value - need [n] as may be a vector
value_deriv1: (optional) NX_FLOAT (Rank: same as field value, Dimensions: same as field value) {units=NX_ANY}
Nominal/average first derivative of value e.g. strain rate - same dimensions as “value” (may be a vector)
value_deriv2: (optional) NX_FLOAT (Rank: same as field value, Dimensions: same as field value) {units=NX_ANY}
Nominal/average second derivative of value - same dimensions as “value” (may be a vector)
external_field_brief: (optional) NX_CHAR
Any of these values:
along beam
across beam
transverse
solenoidal
flow shear gradient
flow vorticitydepends_on: (optional) NX_CHAR
NeXus positions components by applying a set of translations and rotations to apply to the component starting from 0, 0, 0. The order of these operations is critical and forms what NeXus calls a dependency chain. The depends_on field defines the path to the top most operation of the dependency chain or the string “.” if located in the origin. Usually these operations are stored in a NXtransformations group. But NeXus allows them to be stored anywhere.
geometry: (optional) NXgeometry
DEPRECATED: Use the field depends_on and NXtransformations to position the beamstop and NXoff_geometry to describe its shape instead
Defines the axes for logged vector quantities if they are not the global instrument axes.
value_log: (optional) NXlog
Time history of sensor readings
value_deriv1_log: (optional) NXlog
Time history of first derivative of sensor readings
value_deriv2_log: (optional) NXlog
Time history of second derivative of sensor readings
external_field_full: (optional) NXorientation
For complex external fields not satisfied by External_field_brief
OFF_GEOMETRY: (optional) NXoff_geometry
This group describes the shape of the sensor when necessary.
TRANSFORMATIONS: (optional) NXtransformations
This is the group recommended for holding the chain of translation and rotation operations necessary to position the component within the instrument. The dependency chain may however traverse similar groups in other component groups.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.