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The lock-in amplifier used to measure the amplitude (RMS) of an AC signal buried in noise is an effective measuring instrument for optical measurement applications using an optical chopper. The pulsed light incident on the sample through the optical chopper changes its amplitude state due to the light absorption of the sample. By detecting this weak test signal with the lock-in amplifier and comparing it with a reference signal input from a different path through the same chopper, the optical absorption characteristics of the sample can be measured. The lock-in amplifier can be considered a type of AC voltmeter, but it excels in noise resistance and has the ability to sensitively measure and detect the amplitude and phase of weak AC signals, as well as small phase changes. The dynamic reserve, which succinctly represents the performance of the lock-in amplifier (the ratio of the noise signal current to the test signal current), has a specification of 60 dB. This indicates that even if the noise current is 1000 times larger than the test signal current, it can still be measured with this device. However, as mentioned above, a reference signal (reference signal) is always necessary for comparison during measurement. *You can download the catalog from Edmund Optics Japan below.*

■Calculation of amplitude, phase, and relative ratio (R) by 2-phase decomposition ■X, Y offset control ■Wide gain setting from 3μV to 1V ■Supports differential input or single-ended grounded input ■Time constant setting from 100μs to 30s (11 levels in total) ■Phase can be controlled in 90° steps or fine-tuned *The catalog of Edmund Optics Japan can be downloaded from the link below.

Edmund Optics (EO) is a leading company in optical components, imaging, and photonics technology. It supports markets worldwide, including R&D, electronics, semiconductors, pharmaceuticals, and biomedical fields. EO's products are used in a wide range of applications, from DNA analysis to retinal biometric authentication and high-speed FA applications. With the integration of EO's latest manufacturing capabilities and global logistics network, it is recognized in the market as the No. 1 supplier of optical components available for stock sale. Japanese customers are served by the local subsidiary, Edmund Optics Japan Co., Ltd.