MOPA Laser Scanner with Dynamic Pulse Control for Distance Measurement
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Solution Overview
Problem
Conventional laser surveying instruments require separate devices for long and short distance measurements due to incompatible light emitting conditions, leading to increased facility costs and poor workability.
Innovation Solution
A laser scanner with a MOPA type laser light source and optical amplifier, capable of adjusting pulse quality through an oscillator control circuit that sets repetition frequency, pulse peak output, and pulse width, allowing for flexible operation and rotation to accommodate various measurement ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same light emitting condition of the laser light source is used for both long distance measurement and short distance measurement, then the device complexity is reduced, but the measurement precision and reliability cannot be satisfied for both measurement ranges
Solution Approach 1:
The patent implements dynamic adjustment of laser light source parameters (pulse width, pulse repetition frequency, pulse peak output) based on the measurement distance. The control unit automatically selects appropriate emission conditions: for long distances, it uses longer pulse widths and lower repetition frequencies to extend detection range, while for short distances, it uses shorter pulse widths and higher repetition frequencies to improve measurement precision. This dynamic adaptation eliminates the need for separate devices while maintaining measurement quality across different ranges.
Solution Approach 2:
The patent changes the operational parameters of the laser light source according to measurement distance requirements. Specifically, it adjusts pulse width (e.g., 5ns for short distance, 20ns for long distance), pulse repetition frequency (e.g., 100kHz for short distance, 10kHz for long distance), and pulse peak output power. These parameter changes enable a single device to satisfy measurement precision requirements for both short and long distance applications.
2Measurement precision
If different surveying instruments are prepared for long distance measurement and short distance measurement, then the measurement precision for each range is satisfied, but the facility costs increase and workability deteriorates
Solution Approach 1:
The patent creates a universal surveying instrument that can perform both long distance and short distance measurements with high precision. By integrating a controllable laser light source with adjustable parameters and a control unit that automatically selects appropriate emission conditions based on measurement distance, the single device replaces multiple specialized instruments. This multi-functionality improves ease of operation while maintaining measurement precision across different ranges.
3Measurement precision
If different surveying instruments are prepared for long distance measurement and short distance measurement, then the measurement precision for each range is satisfied, but the facility costs increase
Solution Approach 1:
The patent reduces facility costs by replacing multiple specialized surveying instruments with a single multi-functional device. The instrument includes a laser light source with adjustable parameters and a control unit that automatically adapts emission conditions to the measurement distance, enabling one device to perform both long distance and short distance measurements with high precision, thereby eliminating the need to purchase and maintain separate instruments.
Solution Approach 2:
The patent enables cost reduction through parameter changes in the laser light source operation. By dynamically adjusting pulse width, pulse repetition frequency, and pulse peak output based on measurement distance, the single instrument achieves measurement precision comparable to specialized devices for both long and short ranges, eliminating the need for multiple expensive instruments.
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
Enables flexible selection of pulse quality, expands measurement range with a single instrument, reduces facility costs, and improves measurement convenience by adapting to different distance measurements.
Implementation Method 1
an optical amplifier, capable of adjusting pulse quality through an oscillator control circuit that sets repetition frequency, pulse peak output, and pulse width
Data Source
AI summary
The invention provides a laser scanner, which comprises a light source unit, a light receiving unit, a distance measuring unit, an angle measuring unit, a telescope unit capable of rotating in a horizontal direction and a vertical direction, a rotation driving unit, a directional angle detector, and a control arithmetic unit, wherein the light source unit is an MOPA type and has an oscillator control circuit, a main oscillator, and an optical amplifier, wherein the oscillator control circuit has a repetition frequency setting component, a pulse peak output setting component, a pulse width setting component and an amplification factor calculating component and oscillates the main oscillator corresponding to a measured distance, and wherein the amplification factor calculating component calculates an amplification factor based on a repetition frequency, a pulse peak output, and a pulse width and amplifies the optical amplifier based on a calculated amplification factor.