Pulsed-Light Spectroscopy Trigger Delay for AD Converter Dead Time
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Solution Overview
Problem
Pulsed-light spectroscopy faces challenges due to the long dead time of high-speed AD converters, which impede the device's ability to perform high-speed, high-resolution, and high signal-to-noise ratio measurements.
Innovation Solution
The pulsed-light spectroscopic device incorporates a trigger delay section that delays the trigger signal to be input to the AD converter prior to the rise of the pulse signal, effectively reducing the dead time and improving measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed AD converters are used to digitize analog signals at high sampling rates, then measurement speed and resolution are improved, but dead time increases significantly
Solution Approach 1:
The trigger signal is delayed in advance to coincide with the end of the acquisition period. This preliminary timing adjustment ensures that the trigger signal arrives at the AD converter exactly when the acquisition period ends, minimizing the dead time between consecutive measurements while maintaining high sampling rates.
Solution Approach 2:
The system uses a feedback mechanism where the trigger signal from the pulsed light source is delayed and fed back to the AD converter to synchronize the start of the next acquisition period. This feedback loop ensures continuous operation with minimal dead time by automatically adjusting the timing based on the pulse repetition rate.
2Measurement precision
If the acquisition period is extended to capture more pulses, then measurement accuracy and signal-to-noise ratio are improved, but the dead time between acquisitions increases
Solution Approach 1:
The system dynamically adjusts the acquisition period duration and trigger delay based on the pulse repetition rate and desired number of pulses to be captured. By changing these parameters, the system optimizes the balance between capturing sufficient pulses for good signal-to-noise ratio and minimizing the dead time between acquisitions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the effects of dead time, allowing for continuous data acquisition without missing pulses, thus maintaining high-speed, high-resolution, and high signal-to-noise ratio performance.
Implementation Method 1
it is possible to stretch the pulse width as well by utilizing a group delay in a transmission element such as an optical fiber
Implementation Method 2
broadening the wavelength band using nonlinear optical effects such as self-phase modulation or optical soliton
Implementation Method 3
broadening the wavelength band using nonlinear optical effects such as self-phase modulation or optical soliton
Implementation Method 4
when a photodetector receives broadband stretched pulsed light, a temporal change in light intensity detected by the photodetector corresponds to the light intensity of each wavelength
Data Source
AI summary
The pulse width of light from a pulsed light source 1 is stretched by a stretching element 2 such that an elapsed time and the wavelength of the light in the pulsed light correspond to each other on a one-to-one basis, and the stretched light radiates to an object S. The output of a light receiver 4 that has received light from the object S is digitized by an AD converter 6 and the digitized signal is supplied to a calculation means 5. A trigger signal generated by a trigger signal generator 7 in response to the rise of the pulsed light is delayed by a trigger delay section 74 and supplied to the AD converter 6 after the completion of a dead time T3.