141results about How to "High signal to noise" patented technology

A spectrometer generates Vibrational Circular Dichroism (VCD) measurements having an exceedingly high signal-to-noise ratio, as well as a greater wavelength range over which measurements may be accurately provided. This is achieved by utilizing reflective optics (preferably solely reflective optics, i.e., no refractive elements) to supply a concentrated and collimated input light beam to a sample within a sample cell, and similarly collecting the light output from the sample cell via reflective optics for supply to a detector.

The invention discloses a playback circuit of a micro-array biologic sensor, which includes a buffered output unit, and a current integration unit which is connected with the output terminal of the micro-array biologic sensor and provides a constant bias voltage between the working electrode and the counter electrode of the micro-array biologic sensor, and transforms the current signal from the micro-array biologic sensor into the voltage signal; and a correlated double sampling unit which is connected between the potentiostat current integration unit and the buffered output unit, the voltage signal outputted from the correlated double sampling unit sampling potentiostat current integration unit is denoised and outputted to the buffered output unit. The invention can eliminate the noise signal in the biological microelectrode sensor output signal, and improves the signal-noise ratio of the biological microelectrode sensor output signal.

The invention provides a detection apparatus of carrier envelope phase signals. The detection apparatus is characterized by comprising a pulse oscillator, a fiber amplifier, a spectrum spread device and a collinear type self-reference f-2f carrier envelope phase detection module which are successively connected through an optical path, wherein the collinear type self-reference f-2f carrier envelope phase detection module comprises multiple lenses, a PPLN crystal, a YV04 crystal and a photoelectric detector which are connected through an optical path, the lens is used for converting fiber light output by the spectrum spread device into space light, the YV04 crystal is used for introducing time-delay amounts of fundamental frequency light and frequency multiplication light, and the YV04 crystal is internally of an oblique cleft structure whose left portion and right portion can be vertically adjusted. Femtosecond pulses are injected into high-nonlinearity fibers for generating needed long-wave signals and short-wave signals, phase delays of long-wave signal pulses and short-wave signal pulses are optimized through polarization dispersion and envelope velocity dispersion of the YV04 crystal, and compared to a method of modifying a time-delay amount by use of space light path adjustment in a conventional apparatus, the accuracy is greatly improved.