ulia 2021.9.1

Algorithm to emulate a lock-in amplifier

Universal Software Lock-In Amplifier (ULIA)

An effective algorithm to emulate a Lock-In Amplifier.

Installation

To install ulia you can use pip or setuptools.

Using pip

ulia package can be installed directly from PyPI using pip (pip3).

$ pip3 install ulia

Using setuptools

It can also be installed directly from this repository.

$ git clone https://gitlab.com/UhlDaniel/ulia.git
$ cd ulia
$ python3 setup.py install

Dependencies

This package depends on:

• Numpy
• Scipy
• Numba

Usage

import numpy as np
import ulia


modulation_frequency = 5000.0
sampling_rate = 200000.0

t = np.arange(0, 0.3*sampling_rate) / sampling_rate
signal = np.cos(2*np.pi*t*modulation_frequency)
reference = np.cos(2*np.pi*t*modulation_frequency)

lia = ulia.ULIA(signal.size, sampling_rate, 0.03, 2, 0.2)
lia.load_data(reference, signal)
lia.execute()


# Ignore the first 30% and last 10% of data due to filter artefacts.
x = np.mean(lia.x[int(0.3*lia.x.size):int(0.9*lia.x.size)])
y = np.mean(lia.y[int(0.3*lia.y.size):int(0.9*lia.y.size)])

print(x + 1j * y)