In frontier fields of research such as physics, material science, biomedical science, and so forth, precision in extracting weak signals from high noise background has been a classic challenge for researchers. When the measured signal * is flooded with noise, the ordinary amplifier is helpless, while the lock amplifier is able to capture the deep, weak signal precisely like a "sign cleaner". This will show you how lock amplifiers work, typical applications, and the core advantages of the us srs (stanford research systems) lock amplifiers。
I. The rationale for lock amplifiers: decomposition and noise inhibition
The core principle of the lock amplifier is based on the orthogonality of the sine function and uses sensitivity detection techniques to extract a weak signal. In short, it mixes (multiplier) with input signals through a reference signal that corresponds to the frequency to be measured, and then passes through low-through filters, thereby “finishing” the signal of a given frequency from the noise。
Mathematically speaking, the decomposition of the lock amplifier can be understood as a spectral move: when the input signal is multiplied by the reference signal, the frequency and difference frequency fraction is generated. By filtering the high-frequency components through low-throughput filters, the number of straight-flow fractions is exactly the same as the range and phase information for the signal to be detected。
The modern digital lock amplifier goes further, using a two-phase mode solution - with a reference signal of 90 degrees apart from the two phases, which is provided with the same symmetric (x) and the positive (y), respectively, so that the range of the signal can be calculated at r and the phase of the signal and the output results are not affected by the decomposition of the signal phase. This technological breakthrough made lock amplifiers more stable and reliable in their practical application。
Application industry: “communication detection” from laboratory to industrial site*
The lock amplifiers play an irreplaceable role in a number of areas with zhuo's weak signal detection capability:
1. Physical and optical experiments
Raman spectra, pump-detection spectra: detection of extremely weak dispersive and transient absorption signals
Photophoto-frequency measurement of light speed: capture of phase changes resulting from variations in light range using high-precision phase detection capabilities of lock phase amplifiers
2. Material science
Portable transport rate, hole effect measurement: detection of weak transmission signals in semiconductor materials
Pn consistency capability measurement: accurate representation of non-linear convulsive properties through micro-communicators
3. Sensor development and calibration
Temperature sensor dynamic calibration: extraction of a weak thermal radiation signal in the context of strong noise and high accuracy calibration of the wide temperature zone
Mems/nems sensors: detection of micro-diversion and vibration signals
Biomedicine
Brain/heart telecommunications: extraction of weak biological telecommunications from strong background noise
Fluorescent lifetime imaging, quantum transfer: detection of extremely weak photons
5. Industrial detection and failure analysis
Laser voltage detection and imaging: analysis of points of failure of semiconductor devices
Vibration monitoring: capture small vibration signals from mechanical structures
Iii. Us srs lock amplifiers: product advantage characteristics
L full digit dsp structure, high phase precision, high stability
L widewidth overwrite to support signal detection from mhz to mhz
L high-dynamic reserve, still accurately measured in a noise environment
L autogain / auto phase, quick and efficient
L support voltage / current input, harmonization, double frequency mode
L enriched interfaces, adaptation laboratory automation and system integration
Srs lock amplifiers can also be selected with a variety of special pre-amplifiers to increase sensitivity further:
Sr550: fet input pre amplifier
Sr552: bjt input pre-enricher
Sr554: transformer input pre-enricher
In addition, sr540 optical beheaders can be used in conjunction with lock amplifiers and are widely used in optical experiments。
Iii. Selection of srs lock amplifiers for pioneer technology
As a gold* agent of the united states srs in the china region, pioneer technology has been working with srs for 16 years and has accumulated extensive experience in product applications and technical support capabilities。
The following professional services will be provided to clients:
L positive* safeguards: all srs products are original*, complete quality assurance
L profession type: the technical team recommends the most appropriate model and configuration according to your specific application needs
∙ technical support: debugging from pre-sale counselling to post-sale installation to provide full professional guidance
L annex: one-stop production of ssr540 optical amplifiers, various front amplifiers, etc
∙ rapid response: the service network covers the entire country and ensures timely response to client needs
Whether you are a scientist who needs to extract a weak signal from the noise, or an engineer who does precision measurements, pioneer technology can provide you with a suitable srs lock amplifier solution。
