CN-122016039-A - Detection system and detection method for detecting laser energy of emergent head

CN122016039ACN 122016039 ACN122016039 ACN 122016039ACN-122016039-A

Abstract

The invention provides a detection system and a detection method for detecting laser energy of an emergent head, wherein the detection system comprises a power detection assembly, a power acquisition assembly and an upper computer, wherein the power detection assembly comprises a plurality of monitoring units, each monitoring unit comprises a laser emergent head and a power monitoring module which are electrically connected in sequence, each power monitoring module can acquire optical signals and convert the optical signals into analog signals, the power acquisition assembly comprises a power acquisition module which processes the analog signals, the power acquisition module is electrically connected with the plurality of monitoring units so as to acquire and calibrate analog signal data transmitted by the plurality of monitoring units, the upper computer is electrically connected with the upper computer, and the power acquisition module transmits the calibrated analog signal data to the upper computer to store and judge whether the analog signal data are abnormal. The invention can realize synchronous acquisition of energy and power of the multi-path laser emergent head, high-precision conversion of real-time data and data transmission, and is suitable for detection requirements of multi-path laser equipment.

Inventors

HUANG JIAWEI
LI HAI
CHEN JIEBIN
HAN DI

Assignees

深圳市联赢激光股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. A detection system for detecting laser energy of an exit head, comprising: The power detection assembly comprises a plurality of monitoring units, wherein each monitoring unit comprises a laser emergent head and a power monitoring module which are electrically connected in sequence; The power acquisition assembly comprises a power acquisition module for processing analog signals, and the power acquisition module is electrically connected with the monitoring units to acquire and calibrate analog signal data transmitted by the monitoring units; The power acquisition module is electrically connected with the upper computer, and transmits the analog signal data after the calibration processing to the upper computer, and stores and judges whether the analog signal data is abnormal.
2. The detection system for detecting laser energy of an exit head as claimed in claim 1, wherein, The power monitoring module is provided with a PD photodiode used for collecting laser light signals and converting the laser light signals into analog quantity signals; Each power monitoring module is provided with a DB9 output interface, and each power monitoring module is transmitted to a DB9 receiving interface of the power acquisition module through the corresponding DB9 output interface.
3. The detection system for detecting laser energy of an exit head as claimed in claim 2, wherein, The power monitoring module comprises a first operational amplifier chip, a first RC parallel circuit, a first potentiometer and a second RC parallel circuit.
4. The detection system for detecting laser energy of an exit head as claimed in claim 2, wherein, The power acquisition module comprises a second operational amplifier chip and a third RC parallel circuit.
5. The detection system for detecting laser energy of an exit head as claimed in claim 3, wherein, The first operational amplifier chip comprises a first operational amplifier unit and a second operational amplifier unit; the first operational amplifier unit is a transimpedance amplifier, and the second operational amplifier unit is an inverse proportional amplifier; The output end of the first operational amplifier unit is connected with one end of the first RC parallel circuit, the inverting input end of the first operational amplifier unit is connected with the other end of the first RC parallel circuit, the non-inverting input end of the first operational amplifier unit is connected with the cathode of the photodiode PD, and the anode of the photodiode PD is grounded; the output end of the first operational amplifier unit is connected to the inverting input end of the first operational amplifier unit through a resistor R2, and a voltage dividing network formed by a first potentiometer VR1 and a resistor R3 provides direct current bias for the second operational amplifier unit; The inverting input end of the second operational amplifier unit is connected with one end of the second RC parallel circuit, the output end of the second operational amplifier unit is connected with the other end of the second RC parallel circuit, and the non-inverting input end of the second operational amplifier unit is grounded.
6. The detection system for detecting laser energy of an exit head as claimed in claim 4, wherein, The second operational amplifier chip comprises a third operational amplifier unit, a fourth operational amplifier unit, a fifth operational amplifier unit and a sixth operational amplifier unit; The third operational amplifier unit is a differential signal input end, the fourth operational amplifier unit is a voltage follower circuit, the fifth operational amplifier unit is a subtracter, and the sixth operational amplifier unit is an inverse proportional amplifier; The positive input end (ADC IN V1+) is connected to the non-inverting input end of the third operational amplifier unit through a resistor R6, the negative input end (ADC IN V1-) is connected to the inverting input end of the third operational amplifier unit through a resistor R8, the non-inverting input end of the third operational amplifier unit is grounded through a resistor R5, the inverting input end of the third operational amplifier unit is connected to the output end of the third operational amplifier unit through a resistor R10, and the output end of the third operational amplifier unit is connected to the inverting input end of the sixth operational amplifier unit through a resistor R7; The reference voltage input end (REF 4.5V) is connected to the non-inverting input end of the fourth operational amplifier unit through a resistor R47, the inverting input end of the fourth operational amplifier unit is connected to the output end of the fourth operational amplifier unit, the output end of the fourth operational amplifier unit is connected to the non-inverting input end of the sixth operational amplifier unit through a resistor R45, the non-inverting input end of the sixth operational amplifier unit is grounded through a resistor R46, and the inverting input end of the sixth operational amplifier unit is connected to the output end of the sixth operational amplifier unit through a resistor R9; the output end of the sixth operational amplifier unit is connected to the inverting input end of the fifth operational amplifier unit through a resistor R48, the non-inverting input end of the fifth operational amplifier unit is grounded, a third RC parallel circuit formed by connecting a resistor R59 and a capacitor C71 IN parallel is connected between the inverting input end and the output end of the fifth operational amplifier unit, the output end of the fifth operational amplifier unit is connected to the output end (ADC IN V3) through a resistor R62, and the output end is grounded through a capacitor C13.
7. The detection system for detecting laser energy of an exit head of claim 5, wherein, The second RC parallel circuit comprises a capacitor C4, a resistor R4 and a second potentiometer VR2.
8. The detection system for detecting laser energy of an exit head as claimed in claim 1, wherein, The number of the monitoring units is three.
9. A detection method for detecting laser energy of an exit head, employing the detection system for detecting laser energy of an exit head according to any one of claims 1 to 8, characterized by comprising the steps of: step S100, a power monitoring module is arranged at a laser emergent head, when the laser emergent head outputs laser, a PD photodiode acquires a laser light signal and converts the laser light signal into an analog signal, and analog signal data is transmitted to a power acquisition module to finish signal acquisition; step S200, the power acquisition module processes the received analog quantity signal, calculates laser energy through an integral algorithm, restores real-time power, compensates accuracy through a calibration algorithm, and completes the processing of the analog quantity signal; step S300, the power acquisition module sends the calculated laser power and energy data to the PC host computer to complete data transmission; step S400, the upper computer stores and judges the data; if the data exceeds the preset alarm threshold K, an abnormal prompt is sent out, If the data is lower than the preset alarm threshold K, the data is monitored in real time.
10. The method for detecting laser energy of an exit head as claimed in claim 9, wherein, In step S200, the power acquisition module processes the received analog quantity signal, records a real energy value E1, and calculates and obtains a laser energy value E through an integral algorithm; The calculation formula of the integral algorithm is as follows: E=(P1+P2+P3+...+Pn)×Δt wherein Δt is a time slice; time slice Δt=pulse width T/number of acquisitions N; P1 is the power corresponding to t1, P2 is the power corresponding to t2, P3 is the power corresponding to t3, pn is the power corresponding to tn; the calculation formula of the compensation precision of the calibration algorithm is as follows: Ej=E×a3+E×b2+E×c+d Wherein a, b, c, d is a fitting parameter, E is laser energy, and Ej is a laser energy calibration value.

Description

Detection system and detection method for detecting laser energy of emergent head Technical Field The invention relates to the technical field of laser detection, in particular to a detection system and a detection method for detecting laser energy of an emergent head. Background In the laser processing field, the energy and power detection of a laser emergent head are key for guaranteeing the processing precision, and the existing laser detection device has the problems of limited acquisition paths and low signal transmission and conversion precision, and is mostly of integrated design, inconvenient to assemble and disassemble and poor in suitability. Meanwhile, the traditional detection equipment lacks a standardized signal transmission interface, has low data interaction efficiency with an upper computer, cannot realize synchronous acquisition, real-time transmission and accurate reduction of multiple paths of data, and is difficult to meet the detection requirement of the multi-optical-path laser processing equipment, and the real-time monitoring and fault investigation of the production process are affected. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a detection system and a detection method for detecting the laser energy of an emergent head, which can realize synchronous acquisition of the energy and the power of the multi-path laser emergent head, high-precision conversion of real-time data and data transmission and adapt to the detection requirement of multi-path laser equipment. The embodiment of the invention is realized by the following technical scheme: a detection system for detecting laser energy of an exit head, comprising: The power detection assembly comprises a plurality of monitoring units, wherein each monitoring unit comprises a laser emergent head and a power monitoring module which are electrically connected in sequence; The power acquisition assembly comprises a power acquisition module for processing analog signals, and the power acquisition module is electrically connected with the monitoring units to acquire and calibrate analog signal data transmitted by the monitoring units; The power acquisition module is electrically connected with the upper computer, and transmits the analog signal data after the calibration processing to the upper computer, and stores and judges whether the analog signal data is abnormal. According to a preferred embodiment, the power monitoring module is provided with a PD photodiode to collect laser light signals and convert them into analog signals; Each power monitoring module is provided with a DB9 output interface, and each power monitoring module is transmitted to a DB9 receiving interface of the power acquisition module through the corresponding DB9 output interface. According to a preferred embodiment, the power monitoring module comprises a first operational amplifier chip, a first RC parallel circuit, a first potentiometer and a second RC parallel circuit. According to a preferred embodiment, the power harvesting module comprises a second op-amp chip and a third RC parallel circuit. According to a preferred embodiment, the first operational amplifier chip comprises a first operational amplifier unit and a second operational amplifier unit; the first operational amplifier unit is a transimpedance amplifier, and the second operational amplifier unit is an inverse proportional amplifier; The output end of the first operational amplifier unit is connected with one end of the first RC parallel circuit, the inverting input end of the first operational amplifier unit is connected with the other end of the first RC parallel circuit, the non-inverting input end of the first operational amplifier unit is connected with the cathode of the photodiode PD, and the anode of the photodiode PD is grounded; the output end of the first operational amplifier unit is connected to the inverting input end of the first operational amplifier unit through a resistor R2, and a voltage dividing network formed by a first potentiometer VR1 and a resistor R3 provides direct current bias for the second operational amplifier unit; The inverting input end of the second operational amplifier unit is connected with one end of the second RC parallel circuit, the output end of the second operational amplifier unit is connected with the other end of the second RC parallel circuit, and the non-inverting input end of the second operational amplifier unit is grounded. According to a preferred embodiment, the second operational amplifier chip comprises a third operational amplifier unit, a fourth operational amplifier unit, a fifth operational amplifier unit and a sixth operational amplifier unit; The third operational amplifier unit is a differential signal input end, the fourth operational amplifier unit is a voltage follower circuit, the fifth operational amplifier unit is a subtracter, and the sixth operational amplifier unit is an inv