2.3.3.3.113. NXlockin

Status:

base class (contribution), extends NXamplifier

Description:

A base class definition for a lock-in amplifier. ...

A base class definition for a lock-in amplifier.

The lock-in amplifier information: the device is being used to extract a (potentially) very weak input signal buried in the noisy background, where the input signal has the same frequency (or its harmonic) as a known reference signal, using heterodyne detection. This method extracts the amplitude and phase shift of the current signal to the reference. The reference signal might be created by a generator built-in into the lock-in amplifier.

Symbols:

No symbol table

Groups cited:

NXfabrication

Structure:

bias_divider: (optional) NX_CHAR

Bias divider for lock-in channel if if has. ...

Bias divider for lock-in channel if if has. Bias divider = V(ref)/[V(ref)+V(input)]

modulation_status: (optional) NX_BOOLEAN

Switch the lock-in modulation on or off.

modulation_signal: (optional) NX_CHAR

A periodic voltage signal generated by the lock-in, ...

A periodic voltage signal generated by the lock-in, usually applied to a sample and used to create a reference signal for the detection of the input signal

lockin_current_flip_sign: (optional) NX_NUMBER

The sign (1 or -1) that defines the sign of the lock-in current. ...

The sign (1 or -1) that defines the sign of the lock-in current. The calibration procedure with retracted tip is normally performed to compensate for the signal phase delay in SPM. The procedure yields two possible solutions, this number should be equal to 1 or -1 depending on which solution is chosen (this concept mainly used in STS experiments, e.g. in Nanonis machine).

reference_amplitude: (optional) NX_NUMBER {units=NX_ANY}

Amplitude of the reference signal for the lock-in amplifier.

reference_frequency: (optional) NX_NUMBER {units=NX_FREQUENCY}

Frequency of the reference signal for the lock-in amplifier.

reference_phase: (optional) NX_NUMBER {units=NX_ANGLE}

Phase of the reference signal set in the lock-in amplifier.

demodulated_signal: (optional) NX_CHAR

Type of the demodulated signal, current | voltage.

demodulated_frequency: (optional) NX_NUMBER {units=NX_FREQUENCY}

The frequency of the demodulated signal.

frequency_demodulation_bandwidth: (optional) NX_NUMBER {units=NX_FREQUENCY}

The bandwidth of the modulating signal that can be applied in frequency ...

The bandwidth of the modulating signal that can be applied in frequency demodulation mechanism.

phase_modulation_bandwidth: (optional) NX_NUMBER {units=NX_FREQUENCY}

The bandwidth of the modulating signal over which modulated signal spread.

amplitude_modulation_bandwidth: (optional) NX_NUMBER {units=NX_FREQUENCY}

The bandwidth of the modulating signal over which modulated signal spread.

demodulated_amplitude: (optional) NX_NUMBER {units=NX_ANY}

The amplitude of the demodulated signal.

demodulated_phase: (optional) NX_NUMBER {units=NX_ANGLE}

The phase of the demodulated signal.

demodulator_channels: (optional) NX_CHAR

List of the demodulator channels.

low_pass_N: (optional) NX_NUMBER {units=NX_FREQUENCY}

Frequency of the low-pass filter applied on the demodulated ...

Frequency of the low-pass filter applied on the demodulated signals (X,Y), cut-off frq (low pass filter) (for each DemodulatorChannels).

hi_pass_N: (optional) NX_NUMBER {units=NX_FREQUENCY}

Frequency of the high-pass filter applied on the demodulation ...

Frequency of the high-pass filter applied on the demodulation signal cut-off frq (hi pass filter) (for each DemodulatorChannels).

lp_filter_order_N: (optional) NX_NUMBER

Order of the low-pass filter applied on the demodulated signals (X, Y). ...

Order of the low-pass filter applied on the demodulated signals (X, Y). Reducing the bandwidth or increasing the order reduces noise on the demodulated signals, but increases settling and measurement times.

hp_filter_order_N: (optional) NX_NUMBER

Order of the high-pass filter applied on the demodulation ...

Order of the high-pass filter applied on the demodulation signal. This is used mainly to suppress a DC component of the input signal noise.

ref_phase_N: (optional) NX_NUMBER {units=NX_ANGLE}

An extra reference phase offset of reference signal with respect to the demodu ...

An extra reference phase offset of reference signal with respect to the demodulated signal (foreach Channels).

integration_time: (optional) NX_NUMBER {units=NX_TIME}

Integration time for the product of the input and the reference signals

harmonic_order_N: (optional) NX_NUMBER

The reference signal can be a higher harmonic of the modulation signal. ...

The reference signal can be a higher harmonic of the modulation signal. Here the order of the harmonic is stored.

sensitivity_factor: (optional) NX_NUMBER

Ratio of output signal amplitude to input signal amplitude (V/V).

hardware: (optional) NXfabrication

Hardware manufacturers and type (product number) of lock-in amplifier.

Hypertext Anchors

List of hypertext anchors for all groups, fields, attributes, and links defined in this class.

NXDL Source:

https://github.com/FAIRmat-NFDI/nexus_definitions/tree/fairmat/contributed_definitions/NXlockin.nxdl.xml