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Applications


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  • This report evaluates the performance of Lock-in Amplifier(LIA) between OE1022 and SR830 by three different applications: 1. Grating spectrometer measurement on OE1021 and SR830; 2. Weak current measurement on OE1022 and SR830; 3. Performance report of SINE OUT function of OE1022-B(advanced OE1022).
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  • Spectral measurement system built by a lock-in amplifier and a chopper, only measures the light intensity with a modulated frequency, so as to avoid the influence of other external noise, which can achieve the detection of low light with high precision.
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  • The traditional lock-in amplifier have many defects due to using analog technology to achieve coherent modulation which greatly limits the phase-sensitive detector accuracy, and also introduces a lot of background noise.
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  • The basic function of the lock-in amplifier is to extract the target signal from the noisy environment. According to the cause of the noise, it can be roughly divided into two types: the internal noise of the system and the external noise.
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  • The main parameters of lock-in amplifiers include full scale input level, overload, minimum discernible signal, input total dynamic range, output dynamic range and dynamic reserve.
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  • Lock-in amplifier is widely used in temperature detection, photoelectric detection, biological signal detection, geological exploration and so on.
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  • Lock-in amplifiers are used to detect and measure very small AC signals. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger.
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  • Tensile tests are to be carried out when evaluating the strength of metallic materials. In order to detect small changes in metal cracks or shape, you can measure the AC resistance of sample (called AC potential method).
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  • Turbine flaw detectors used by smelters are a type of device similar to metal detectors that can automatically check for metal body damage.
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  • The metal detector measures the small change in the sensor's transfer function with a lock-in amplifier.
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  • Samples of superconducting material applied by a weak alternating voltage can occur a weak current through itself, which can be measured by LIA in order to avoid the measurement error from thermoelectric EMF effect.
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  • To measure the chemical impedance at complex frequencies, a frequency response analyzer, known as the digital version of the lock-in amplifier, is used to make the frequency sweep easier to use.
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  • Methods for measuring electrons emitted from the surface of a sample include Vacuum Ultraviolet Photoelectron Spectroscopy (UPS), X-ray Photoelectron Spectroscopy (XPS) and so on.
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  • Photo Acoustic Spectroscopy (PAS) is an analytical instrument with a mechanism similar to that of a secondary quantum optical spectrometer.
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  • The light from the beam splitter is converted into an electrical signal by the sensor. The sample beam and the reference beam are analyzed by two lock-in amplifiers with respective cut-off frequencies as reference frequencies, and the ratio of the two beams is calculated by the comparator.
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  • In the laser phase-locked system, the most crucial part is the use of lock-in amplifier to achieve the test gas, reference gas two-way detection, or even to achieve the measured gas, reference gas and laser background three-way detection.
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  • The corrected DC current of the lock-in amplifier is equal to the DC current flowing through it. The current can be measured by measuring the output of the lock-in amplifier.
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  • There are two basic methods for connecting a voltage signal to the lock-in amplifier- the single-ended connection is more convenient while the differential connection eliminates spurious pick-up more effectively.