Laser peak power detection device and laser medical equipment

Abstract

The application provides a laser peak power detection device and a laser medical equipment, the laser peak power detection device comprises a noise signal extraction module, a laser peak power signal extraction module and a signal-to-noise comparison difference module; the input end of the noise signal extraction module is electrically connected with a load power supply ground, the output end of the noise signal extraction module is electrically connected with the first input end of the signal-to-noise comparison difference module, and the output end of the laser peak power signal extraction module is electrically connected with the second input end of the signal-to-noise comparison difference module; the noise signal extraction module is used for extracting a ripple noise signal coupled in the load power supply ground; the laser peak power signal extraction module is used for extracting a laser peak signal from a laser signal; and the signal-to-noise comparison difference module is used for comparing and subtracting the laser peak signal and the noise signal to obtain a laser peak power after removing a ripple noise component. The application improves the detection precision of the laser peak power.

Description

Technical Field

[0001] This invention relates to the field of laser power monitoring technology, and in particular to a laser peak power detection device and a laser medical device. Background Technology

[0002] Current laser power monitoring technologies typically employ a high-precision beam splitter to proportionally divide the main laser beam, retrieving a small portion, such as 1%. The split laser beam is then coupled to a photodiode (PD) to sample its peak power, and the signal is monitored by a monitoring circuit to detect the peak power. However, laser monitoring circuits often contain inherent ripple noise, resulting in noise components in the detected peak power signal. Existing laser peak power detection technologies usually rely on software filtering, which is difficult to achieve ideal results. Furthermore, the noise reduction process is relatively complex and prone to introducing power measurement errors, thus reducing the accuracy of laser peak power detection. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a laser peak power detection device and a laser medical device. The laser peak power detection device has a simple structure, the process of denoising and extracting pure laser peak power signals is simple, it does not introduce power measurement errors, and improves the detection accuracy of laser peak power.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, embodiments of the present invention provide a laser peak power detection device, comprising: a noise signal extraction module, a laser peak power signal extraction module, and a signal-to-noise comparison and difference calculation module; The input terminal of the noise signal extraction module is electrically connected to the load power supply ground, the output terminal of the noise signal extraction module is electrically connected to the first input terminal of the signal-to-noise comparison and difference module, and the output terminal of the laser peak power signal extraction module is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The noise signal extraction module is used to extract noise signals from the ripple noise signal coupled in the load power ground. The laser peak power signal extraction module is used to extract the laser peak signal from the laser signal; The signal-to-noise comparison and difference module is used to compare and differ the laser peak signal and the noise signal to obtain the laser peak power after removing the ripple noise component.

[0005] Furthermore, the present invention provides a first possible implementation of the first aspect, wherein the laser peak power detection device further includes: an analog-to-digital converter and a processing module; The input terminal of the analog-to-digital converter is electrically connected to the output terminal of the signal-to-noise comparison and difference module, and the output terminal of the analog-to-digital converter is electrically connected to the processing module. The analog-to-digital converter is used to convert the laser peak power after removing noise components from an analog signal into a digital signal; The processing module is used to determine whether the laser peak power exceeds the laser peak alarm threshold based on the digital signal of the laser peak power, and to issue an alarm prompt when the laser peak power exceeds the laser peak alarm threshold.

[0006] Furthermore, this embodiment of the invention provides a second possible implementation of the first aspect, wherein the signal-to-noise comparison and difference module includes an operational amplifier; The output terminal of the noise signal extraction module is electrically connected to the negative input terminal of the operational amplifier, and the output terminal of the laser peak power signal extraction module is electrically connected to the positive input terminal of the operational amplifier. The operational amplifier is used to compare and calculate the difference between the laser peak signal and the noise signal, and outputs the laser peak power after removing the noise component through the output terminal.

[0007] Furthermore, this embodiment of the invention provides a third possible implementation of the first aspect, wherein the noise signal extraction module includes a noise sampling amplification unit and a rectification and filtering unit; The input terminal of the noise sampling amplification unit is electrically connected to the load power supply ground, the output terminal of the noise sampling amplification unit is connected to the input terminal of the rectifier filter unit, and the output terminal of the rectifier filter unit is electrically connected to the first input terminal of the signal-to-noise comparison and difference module. The noise sampling and amplification unit is used to sample and extract the ripple noise signal coupled to the load power supply ground, and to amplify the noise signal. The rectifier and filter unit is used to shape and filter the amplified noise signal to convert the amplified noise signal from a high-frequency AC signal into an equivalent DC signal.

[0008] Furthermore, this embodiment of the invention provides a fourth possible implementation of the first aspect, wherein the noise signal extraction module further includes: a first amplification unit; The input terminal of the first amplification unit is electrically connected to the output terminal of the rectifier and filter unit, and the output terminal of the first amplification unit is electrically connected to the first input terminal of the signal-to-noise comparison and difference module. The first amplification unit is used to amplify the noise signal after it has been shaped and filtered.

[0009] Furthermore, this embodiment of the invention provides a fifth possible implementation of the first aspect, wherein the noise signal extraction module further includes: an AC coupling unit; The AC coupling unit is connected between the noise sampling amplification unit and the rectifier filter unit, and the AC coupling unit is used to couple the high-frequency AC signal in the noise signal to the rectifier filter unit.

[0010] Furthermore, this embodiment of the invention provides a sixth possible implementation of the first aspect, wherein the laser peak power signal extraction module includes a laser sampling amplification unit and a filtering unit; The input terminal of the laser sampling amplification unit is used to acquire laser signals, the output terminal of the laser sampling amplification unit is connected to the input terminal of the filtering unit, and the output terminal of the filtering unit is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The laser sampling and amplification unit is used to extract the laser peak signal and amplify the signal; The filtering unit is used to perform noise filtering on the amplified laser peak signal.

[0011] Furthermore, this embodiment of the invention provides a seventh possible implementation of the first aspect, wherein the laser peak power signal extraction module further includes: a second amplification unit; The input terminal of the second amplification unit is electrically connected to the output terminal of the filter unit, and the output terminal of the second amplification unit is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The second amplification unit is used to amplify the laser peak signal after noise filtering.

[0012] Furthermore, this embodiment of the invention provides an eighth possible implementation of the first aspect, wherein the signal amplification factor of the noise sampling amplification unit is equal to the signal amplification factor of the laser sampling amplification unit; The signal amplification factor of the first amplification unit is equal to that of the second amplification unit.

[0013] In a second aspect, embodiments of the present invention also provide a laser medical device, comprising: a laser, a power supply circuit, and a laser peak power detection device as described in any one of the first aspects; The noise signal extraction module is connected to the ground terminal of the power supply circuit, and the noise signal extraction module is used to extract noise signals from the ripple noise signal at the ground terminal of the power supply circuit. The laser peak power signal extraction module is used to extract the laser peak signal from the laser signal emitted by the laser.

[0014] This invention provides a laser peak power detection device and a laser medical device. The laser peak power detection device includes: a noise signal extraction module, a laser peak power signal extraction module, and a signal-to-noise comparison and difference module. The input terminal of the noise signal extraction module is electrically connected to the load power supply ground, the output terminal of the noise signal extraction module is electrically connected to the first input terminal of the signal-to-noise comparison and difference module, and the output terminal of the laser peak power signal extraction module is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The noise signal extraction module is used to extract noise signals from ripple noise signals coupled to the load power supply ground. The laser peak power signal extraction module is used to extract laser peak signals from the laser signal. The signal-to-noise comparison and difference module is used to compare and differ the laser peak signal and the noise signal to obtain the laser peak power after removing the ripple noise component. This invention extracts ripple noise signals coupled to the power supply ground using a noise signal extraction module to sample the system's base noise signal. By comparing and subtracting the acquired laser peak signal and noise signal, a clean laser peak power signal after removing ripple noise can be extracted. Furthermore, the laser peak power detection device has a simple structure, and the denoising extraction process for the clean laser peak power signal is convenient, without introducing power measurement errors, thus improving the detection accuracy of laser peak power.

[0015] Other features and advantages of the embodiments of the present invention will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above in the embodiments of the present invention.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a laser peak power detection device provided in an embodiment of the present invention is shown. Figure 2 A schematic diagram of a laser peak power detection circuit provided in an embodiment of the present invention is shown; Figure 3 This diagram illustrates a noise signal processing state provided by an embodiment of the present invention. Figure 4This diagram illustrates a laser peak signal extraction and processing procedure provided in an embodiment of the present invention. Figure 5 The diagram illustrates a signal-to-noise comparison and difference calculation process provided by an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0020] Currently, to ensure the accuracy of power monitoring results, noise suppression processing is required for the output signal of the detection circuit. Current methods, such as optimizing circuit topology or digital signal processing algorithms (e.g., moving average filtering and wavelet denoising), are used to filter out ripple noise and improve the signal-to-noise ratio and stability of power detection. However, achieving ideal noise reduction is difficult, and the process is relatively complex. Therefore, finding a simple and effective way to filter out ripple noise has become an urgent problem. To improve these issues, this invention provides a laser peak power detection device and a laser medical device, which are described in detail below.

[0021] This embodiment provides a laser peak power detection device, see [link / reference] Figure 1 The schematic diagram of the laser peak power detection device shown includes: a noise signal extraction module 10, a laser peak power signal extraction module 20, and a signal-to-noise comparison and difference module 30. The input terminal of the noise signal extraction module 10 is electrically connected to the load power supply ground, and the output terminal of the noise signal extraction module 10 is electrically connected to the first input terminal of the signal-to-noise comparison and difference module 30. The output terminal of the laser peak power signal extraction module 20 is electrically connected to the second input terminal of the signal-to-noise comparison and difference module 30. The noise signal extraction module 10 is used to extract noise signals from the ripple noise signal coupled to the load power supply ground. The noise signal extraction module 10 is used to sample and amplify the noise signal in the load power supply ground. The noise signal extraction module may use a signal amplification circuit to sample and amplify the noise signal. The signal amplification circuit may include components such as transistors, MOSFETs or operational amplifiers that are in the amplification state.

[0022] The aforementioned load power supply ground is the ground terminal of the power circuit of the device where the laser peak power detection device is located. The inventors have discovered that the inherent ripple noise in the laser detection circuit mainly originates from the power supply ripple, high-frequency switching noise, amplifier thermal noise, and impedance mismatch. Therefore, the input terminal of the noise signal extraction module 10 is connected to the ground terminal of the power circuit of the device where the laser peak power detection device is located to sample the noise signal of the ripple noise coupled in the load power supply ground.

[0023] The laser peak power signal extraction module 20 is used to extract the laser peak signal from the laser signal; The laser peak power signal extraction module 20 may include components capable of photoelectric conversion to sample the laser signal, and may also include a signal amplification circuit capable of amplifying the sampled laser peak signal for subsequent noise reduction processing.

[0024] The signal-to-noise comparison and difference module 30 is used to compare and differ the laser peak signal and the noise signal to obtain the laser peak power after removing the ripple noise component.

[0025] The aforementioned signal-to-noise comparison and difference module 30 may include a signal difference circuit (which may be a differential difference circuit composed of one or two operational amplifiers) to directly compare and differ the laser peak signal and the noise signal, thereby directly obtaining the pure laser peak power after removing the ripple noise component.

[0026] The laser peak power detection device provided in this embodiment extracts the ripple noise signal coupled to the power supply ground based on the noise signal extraction module to sample the system's base noise signal. By comparing and subtracting the collected laser peak signal and noise signal, a pure laser peak power signal after removing ripple noise can be extracted. Moreover, the laser peak power detection device has a simple structure, the denoising extraction process of the pure laser peak power signal is simple, it does not introduce power measurement errors, and improves the detection accuracy of laser peak power.

[0027] In one implementation, such as Figure 1 As shown, the laser peak power detection device provided in this embodiment further includes: an analog-to-digital converter 40 and a processing module 50; The input terminal of the analog-to-digital converter 40 is electrically connected to the output terminal of the signal-to-noise comparison and difference module, and the output terminal of the analog-to-digital converter 40 is electrically connected to the processing module 50. The analog-to-digital converter 40 is used to convert the noise-removed peak laser power from an analog signal to a digital signal. The processing module 50 is used to determine whether the laser peak power exceeds the laser peak alarm threshold based on the digital signal of the laser peak power, and to issue an alarm prompt when the laser peak power exceeds the laser peak alarm threshold.

[0028] The analog-to-digital converter 40 performs analog-to-digital conversion on the noise-removed laser peak power signal, converting it from an analog signal into a digital signal that can be recognized by the processing module 50. The processing module 50 (i.e., the main controller) calculates the deviation between the actual detected laser peak power and the set value. When the deviation exceeds the set error, it determines that the actual detected laser peak power exceeds the laser peak alarm threshold and issues an alarm, indicating that the laser peak power is in an abnormal state.

[0029] In one implementation, such as Figure 1 As shown, the noise signal extraction module 10 provided in this embodiment includes a noise sampling and amplification unit 11 and a rectification and filtering unit 12; The input terminal of the noise sampling amplification unit 11 is electrically connected to the load power supply ground, the output terminal of the noise sampling amplification unit 11 is connected to the input terminal of the rectifier filter unit 12, and the output terminal of the rectifier filter unit 12 is electrically connected to the first input terminal of the signal-to-noise comparison and difference module 30. The noise sampling and amplification unit 11 is used to sample and extract the ripple noise signal coupled to the load power supply ground, and to amplify the noise signal. The rectifier and filter unit 12 is used to shape and filter the amplified noise signal to convert the amplified noise signal from a high-frequency AC signal into an equivalent DC signal.

[0030] The noise sampling and amplification unit 11 can collect the ripple noise signal of the system and amplify the signal. Since the noise signal collected is a high-frequency AC signal, the rectification and filtering unit 12 can rectify and filter the noise signal to obtain the amplitude of the noise signal in the DC state corresponding to the noise signal, thereby realizing the conversion of the noise signal from a high-frequency AC signal to an equivalent DC signal.

[0031] See also Figure 2 The schematic diagram of the laser peak power detection circuit shown includes a noise sampling and amplification unit comprising a first operational amplifier U1, a first resistor R1, a second resistor R2, capacitors C1 and C2. The positive input terminal (+) of the first operational amplifier U1 is electrically connected to the load power supply ground, and the negative input terminal (-) of the first operational amplifier U1 is electrically connected to the load power supply ground through the first resistor R1. One end of the second resistor R2 is electrically connected to the negative input terminal of the first operational amplifier U1 and the first resistor R1, and the other end is electrically connected to the output terminal of the first operational amplifier U1. The output terminal of the first operational amplifier U1 is electrically connected to the rectifier and filter unit, and capacitors C1 and C2 are respectively electrically connected to the first operational amplifier U1.

[0032] The amplification factor of the first operational amplifier U1 is determined by the first resistor R1 and the second resistor R2. The amplification factor An1 of the first operational amplifier U1 is 1 + R2 / R1.

[0033] In one implementation, such as Figure 1 As shown, the noise signal extraction module 10 provided in this embodiment further includes: a first amplification unit 13; the input terminal of the first amplification unit 13 is electrically connected to the output terminal of the rectifier filter unit 12, and the output terminal of the first amplification unit 13 is electrically connected to the first input terminal of the signal-to-noise comparison and difference module 30; the first amplification unit 13 is used to amplify the noise signal after shaping and filtering.

[0034] like Figure 2 As shown, the first amplification unit includes a second operational amplifier U2, a third resistor R6, a fourth resistor R7, a capacitor C7, and a capacitor C8. The positive input terminal + of the second operational amplifier U2 is electrically connected to the output terminal (resistor R5) of the rectifier filter unit, and the negative input terminal - of the second operational amplifier U2 is grounded through the third resistor R6. One end of the fourth resistor R7 is electrically connected to the third resistor R6 and the negative output terminal - of the second operational amplifier U2, and the other end of the fourth resistor R7 is electrically connected to the output terminal of the second operational amplifier U2. The output terminal of the second operational amplifier U2 is electrically connected to the negative input terminal of the differential operational amplifier U5, and capacitors C7 and C8 are respectively electrically connected to the second operational amplifier U2.

[0035] like Figure 2 As shown, the rectifier filter unit includes a diode D1 and a first RC circuit (which can be a series RC circuit or a parallel RC circuit); the positive terminal of the diode D1 is electrically connected to the output terminal of the first operational amplifier U1, the negative terminal of the diode D1 is connected to the input terminal of the first RC circuit, and the output terminal of the first RC circuit is electrically connected to the non-inverting input terminal of the second operational amplifier U2.

[0036] The first RC circuit includes resistor R4, capacitor C4, resistor R5, and capacitor C5, as follows: Figure 2 As shown, one end of resistor R4 is electrically connected to the output terminal of the first operational amplifier U1, and the other end is electrically connected to one end of resistor R5. The other end of resistor R5 is electrically connected to the non-inverting input terminal of the second operational amplifier U2. One end of capacitor C4 is electrically connected to resistors R4 and R5, and the other end is electrically connected to the ground terminal (i.e., power supply ground). One end of capacitor C5 is electrically connected to resistor R5 and the non-inverting input terminal + of the second operational amplifier U2, and the other end is electrically connected to the ground terminal (i.e., power supply ground).

[0037] The RC circuit formed by diode D1, resistor R4, capacitor C4, resistor R5, and capacitor C5 shapes and filters the amplified noise signal Vn1 (high-frequency AC signal, i.e., the output signal of the first operational amplifier U1) to obtain the equivalent DC signal Vn2 of the ripple noise signal.

[0038] In one implementation, such as Figure 1 As shown, the noise signal extraction module 10 provided in this embodiment further includes: an AC coupling unit 14; the AC coupling unit 14 is connected between the noise sampling amplification unit 11 and the rectifier filter unit 12, and the AC coupling unit 14 is used to couple the high-frequency AC signal in the noise signal to the rectifier filter unit.

[0039] like Figure 2 As shown, the AC coupling unit includes capacitor C3; capacitor C3 is connected between the output terminal of the first operational amplifier U1 and the diode D1 of the rectifier filter unit. Capacitor C3 has the function of blocking DC and passing AC, which can remove the DC signal in the noise signal and couple the AC information of the noise signal to the rectifier filter unit for rectification and filtering.

[0040] See also Figure 3 The diagram illustrates the noise signal processing state. Assume the acquired ripple noise signal, after passing through the first operational amplifier U1, becomes noise signal Vn1 (a high-frequency AC signal). After passing through capacitor C3, the DC signal of noise signal Vn1 is removed, leaving only the AC signal. It then enters the rectifier-filter unit for rectification and filtering, yielding the equivalent DC signal Vn2 of the ripple noise signal. Since the signal impedance increases after passing through the resistor in the rectifier-filter unit, signal attenuation occurs. Therefore, a second amplification unit is added, using the second operational amplifier U2 to perform a two-stage amplification of the noise signal. This strengthens the noise signal after the first stage of amplification, preventing signal attenuation and interference, and improving the acquisition accuracy of the noise signal. The second operational amplifier U2 outputs the amplified noise signal Vn3 (assuming the amplification factor of the second operational amplifier is An2, then Vn3 = Vn2 × An2), which gives the amplitude of the DC noise signal corresponding to the system's base noise signal. This completes the extraction and calibration of the ripple noise signal, allowing the amplified noise signal Vn3 to be input into the differential operational amplifier.

[0041] In one implementation, such as Figure 1 As shown, the laser peak power signal extraction module 20 provided in this embodiment includes a laser sampling and amplification unit 21 and a filtering unit 22; The input terminal of the laser sampling amplification unit 21 is used to acquire laser signals, the output terminal of the laser sampling amplification unit 21 is connected to the input terminal of the filtering unit 22, and the output terminal of the filtering unit 22 is electrically connected to the second input terminal of the signal-to-noise comparison and difference module 30. The laser sampling and amplification unit 21 is used to extract the laser peak signal and amplify the signal; The filtering unit 22 is used to perform noise filtering on the amplified laser peak signal. The laser peak signal acquired by the laser peak power signal extraction module 20 is a laser peak signal carrying noise components.

[0042] like Figure 2 As shown, the laser sampling amplification unit includes a third operational amplifier U3, a photodiode PD (which can be a PD photodiode or other device capable of converting laser signals from optical signals to electrical signals), and a fifth resistor R9; the positive terminal of the photodiode PD is grounded, the negative terminal of the photodiode PD is electrically connected to the negative input terminal of the third operational amplifier U3, and the positive input terminal of the third operational amplifier U3 is grounded; one end of the fifth resistor R9 is electrically connected to the negative input terminal of the third operational amplifier U3, and the other end is electrically connected to the output terminal of the third operational amplifier U3; the output terminal of the third operational amplifier U3 is electrically connected to the input terminal of the filter unit, and the output terminal of the filter unit is electrically connected to the negative input terminal of the differential operational amplifier U5.

[0043] The third operational amplifier U3, the photodiode PD, and the fifth resistor R9 form a transimpedance amplifier that converts the input current signal Ipd of the laser signal collected by the photodiode PD into an output voltage signal, and extracts the laser peak signal to obtain the Vpd1 signal.

[0044] like Figure 2 As shown, the laser sampling amplification unit also includes capacitors C8, C9, and C10. Capacitors C9 and C10 are electrically connected to the third operational amplifier U3, respectively. One end of capacitor C8 is electrically connected to the negative input terminal of the third operational amplifier U3 and the negative terminal of the photodiode PD, and the other end is connected to the ground terminal.

[0045] In one implementation, such as Figure 1 As shown, the laser peak power signal extraction module 20 provided in this embodiment further includes: a second amplification unit 23; The input terminal of the second amplification unit 23 is electrically connected to the output terminal of the filter unit 22, and the output terminal of the second amplification unit 23 is electrically connected to the second input terminal of the signal-to-noise comparison and difference module 30. The second amplification unit 23 is used to amplify the laser peak signal after noise filtering.

[0046] like Figure 2As shown, the second amplification unit includes a fourth operational amplifier U4, a sixth resistor R11, and a seventh resistor R12; the non-inverting input of the fourth operational amplifier U4 is electrically connected to the output of the filter unit (resistor R17), and the negative input of the fourth operational amplifier U4 is grounded through the sixth resistor R11; one end of the seventh resistor R12 is electrically connected to the negative input of the fourth operational amplifier U4 and the sixth resistor R11, and the other end is electrically connected to the output of the fourth operational amplifier U4; the output of the fourth operational amplifier U4 is electrically connected to the non-inverting input of the differential operational amplifier U5; as shown... Figure 2 As shown, the second amplification unit also includes capacitors C11 and C12, which are electrically connected to the fourth operational amplifier U4.

[0047] The filtering unit provided in this embodiment includes a second RC circuit; the output terminal of the third operational amplifier is electrically connected to the input terminal of the second RC circuit, and the output terminal of the second RC circuit is electrically connected to the non-inverting input terminal of the fourth operational amplifier.

[0048] like Figure 2 As shown, the second RC circuit includes resistor R10, capacitor C16, resistor R17, and capacitor C17. One end of resistor R10 is electrically connected to the output terminal of the third operational amplifier U3, and the other end is electrically connected to one end of resistor R17. The other end of resistor R17 is electrically connected to the non-inverting input terminal of the fourth operational amplifier U4. One end of capacitor C16 is electrically connected to resistors R10 and R17, and the other end is grounded. One end of capacitor C17 is electrically connected to resistor R17 and the non-inverting input terminal of the fourth operational amplifier U4, and the other end is grounded.

[0049] See also Figure 4 The diagram shows the laser peak signal extraction and processing process. The transimpedance amplifier, composed of the third operational amplifier U3, photodiode PD, and fifth resistor R9, extracts, samples, and amplifies the laser peak signal to obtain the Vpd1 signal. The Vpd1 signal is then filtered and smoothed by the second RC circuit (resistor R10, capacitor C16, resistor R17, and capacitor C17) to obtain the smooth Vpd2 signal. The Vpd2 signal is then amplified again by the fourth operational amplifier U4, the sixth resistor R11, and the seventh resistor R12 (for signal reinforcement) to obtain the laser peak signal Vpd3. This laser peak signal Vpd3 is a laser peak signal carrying noise components.

[0050] In one embodiment, the signal amplification factor of the noise sampling amplification unit is equal to the signal amplification factor of the laser sampling amplification unit; that is, the amplification factor An1 of the first operational amplifier U1 is equal to the amplification factor Apd1 of the third operational amplifier U3 (i.e., An1=Apd1).

[0051] The signal amplification factor of the first amplification unit is equal to that of the second amplification unit. That is, the amplification factor An2 of the second operational amplifier U2 is equal to the amplification factor Apd2 of the fourth operational amplifier U4 (i.e., An2 = Apd2), where An2 = 1 + R7 / R6 and Apd2 = 1 + R12 / R11. This allows the difference between the amplified noise signal Vn3 and the amplified laser peak signal Vpd3 to directly calculate the laser peak power signal Vpd after removing the ripple noise component.

[0052] In one embodiment, the amplification factors of R10, C16, R17, and C17 in the RC circuit of the laser peak power signal extraction module provided in this embodiment should be equal to those of R4, C4, R5, and C5 in the RC circuit of the noise signal extraction module.

[0053] In one embodiment, the signal-to-noise comparison and difference module provided in this embodiment includes an operational amplifier (such as a differential operational amplifier). The output of the noise signal extraction module is electrically connected to the negative input of the operational amplifier, and the output of the laser peak power signal extraction module is electrically connected to the positive input of the operational amplifier. The operational amplifier is used to compare and subtract the laser peak signal and the noise signal, and outputs the laser peak power after removing the noise component through the output terminal.

[0054] like Figure 2 As shown, the signal-to-noise comparison and difference module includes a differential operational amplifier U5. The output terminal of the noise signal extraction module (i.e., the output terminal of the second operational amplifier U2) is electrically connected to the negative inverting input terminal of the differential operational amplifier U5. The output terminal of the laser peak power signal extraction module (i.e., the output terminal of the fourth operational amplifier U4) is electrically connected to the positive inverting input terminal of the differential operational amplifier U5. The output terminal of the differential operational amplifier U5 is electrically connected to the input terminal of the analog-to-digital converter (ADC), and the output terminal of the ADC is electrically connected to the control module MCU.

[0055] like Figure 2As shown, the signal-to-noise comparison and difference module also includes resistors R8, R13, R14, and R15, and capacitors C13 and C14. Resistor R8 is connected between the output of the second operational amplifier U2 and the negative input of the differential operational amplifier U5. One end of resistor R15 is electrically connected to resistor R8 and the negative input of the differential operational amplifier U5, and the other end is electrically connected to the output of the differential operational amplifier U5. Resistor R13 is connected between the output of the fourth operational amplifier U4 and the positive input of the differential operational amplifier U5. One end of resistor R14 is electrically connected to resistor R13 and the positive input of the differential operational amplifier U5, and the other end is grounded. Capacitors C13 and C14 are electrically connected to the differential operational amplifier U5, and VCC is an external power supply.

[0056] The noise signal Vn3 output from the second operational amplifier U2 enters the negative inverting input (i.e., the inverting input) of the differential operational amplifier U5, and the laser peak power signal Vpd3 output from the fourth operational amplifier U4 enters the negative inverting input (i.e., the non-inverting input) of the differential operational amplifier U5. The difference is calculated by comparing the signals from the differential operational amplifier U5, resistors R8, R15, R13, and R14 to obtain the value of the pure laser peak power signal Vpd. (See example...) Figure 5 The diagram shown illustrates the signal-to-noise comparison and difference processing process. The laser peak power signal Vpd3 and the noise signal Vn3 are compared and the difference is calculated to obtain the pure laser peak power signal Vpd.

[0057] Figure 2 The correspondence between the signals of each node is as follows: An1=Apd1; An2=Apd2; Vn1 = Basis noise × An1; Vn3 = Vn2 × An2; Vpd1=Vpd2=Ipd×R9; Vpd3 = Vpd2 × Apd2; Let the resistance of resistors R8 and R13 be Ra, and the resistance of resistors R14 and R15 be Rf. Then the peak power signal of the laser is Vpd = (Vpd3 - Vn3) × Rf / Ra.

[0058] Wherein, Vn1 is the output signal of the first operational amplifier U1, An1 is the amplification factor of the first operational amplifier U1, Vn2 is the equivalent DC signal of the ripple noise signal obtained after rectification and filtering of Vn1, An2 is the amplification factor of the second operational amplifier U2, and Vn3 is the amplified noise signal output by the second operational amplifier U2; Ipd is the laser signal (i.e., current signal) collected by the photodiode PD, Vpd1 is the output signal of the third operational amplifier U3, Vpd2 is the smoothed signal obtained after filtering and smoothing the Vpd1 signal, Vpd3 is the output signal of the fourth operational amplifier U4, Apd1 is the amplification factor of the third operational amplifier U3, and Apd2 is the amplification factor of the fourth operational amplifier U4.

[0059] The laser peak power detection device provided in this embodiment further includes: a filtering module, which includes a third RC circuit; the input terminal of the third RC circuit is electrically connected to the output terminal of the differential operational amplifier, the output terminal of the third RC circuit is electrically connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is electrically connected to the processing unit.

[0060] like Figure 2 As shown, the third RC circuit includes a resistor R16 and a capacitor C15. The resistor R16 is connected between the output of the differential operational amplifier U5 and the analog-to-digital converter (ADC). One end of the capacitor C15 is electrically connected to the resistor R16 and the ADC, and the other end is grounded.

[0061] The laser peak power detection device provided in this embodiment differs from the traditional method of simply filtering and smoothing analog signals. It provides a method for extracting and calibrating ripple noise signals. Based on the extracted and calibrated ripple noise signals, the pure laser peak power signal is directly extracted by comparing and subtracting the laser peak power signal and the noise signal. This greatly optimizes the processing quality and efficiency of the laser peak power signal by the back-end MCU and improves the accuracy and stability of laser peak power signal detection.

[0062] Corresponding to the laser peak power detection device provided in the above embodiments, this embodiment of the invention provides a laser medical device, which includes: a laser, a power supply circuit, and the laser peak power detection device provided in the above embodiments; The noise signal extraction module is connected to the ground terminal of the power supply circuit. The noise signal extraction module is used to extract noise signals from the ripple noise signal at the ground terminal of the power supply circuit. The laser peak power signal extraction module is used to extract the laser peak signal from the laser signal emitted by the laser.

[0063] The device provided in this embodiment has the same implementation principle and technical effect as the aforementioned embodiment. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the aforementioned device embodiment.

[0064] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0065] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0066] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A laser peak power detection device, characterized in that, include: Noise signal extraction module, laser peak power signal extraction module, and signal-to-noise comparison and difference module; The input terminal of the noise signal extraction module is electrically connected to the load power supply ground, the output terminal of the noise signal extraction module is electrically connected to the first input terminal of the signal-to-noise comparison and difference module, and the output terminal of the laser peak power signal extraction module is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The noise signal extraction module is used to extract noise signals from the ripple noise signal coupled in the load power ground. The laser peak power signal extraction module is used to extract the laser peak signal from the laser signal; The signal-to-noise comparison and difference module is used to compare and differ the laser peak signal and the noise signal to obtain the laser peak power after removing the ripple noise component. The noise signal extraction module includes a noise sampling amplification unit and a rectification and filtering unit; The input terminal of the noise sampling amplification unit is electrically connected to the load power supply ground, the output terminal of the noise sampling amplification unit is connected to the input terminal of the rectifier filter unit, and the output terminal of the rectifier filter unit is electrically connected to the first input terminal of the signal-to-noise comparison and difference module. The noise sampling and amplification unit is used to sample and extract the ripple noise signal coupled to the load power supply ground, and to amplify the noise signal. The rectifier and filter unit is used to shape and filter the amplified noise signal to convert the amplified noise signal from a high-frequency AC signal into an equivalent DC signal.

2. The laser peak power detection device according to claim 1, characterized in that, Also includes: Analog-to-digital converter and processing module; The input terminal of the analog-to-digital converter is electrically connected to the output terminal of the signal-to-noise comparison and difference module, and the output terminal of the analog-to-digital converter is electrically connected to the processing module. The analog-to-digital converter is used to convert the laser peak power after removing noise components from an analog signal into a digital signal; The processing module is used to determine whether the laser peak power exceeds the laser peak alarm threshold based on the digital signal of the laser peak power, and to issue an alarm prompt when the laser peak power exceeds the laser peak alarm threshold.

3. The laser peak power detection device according to claim 1, characterized in that, The signal-to-noise comparison and difference module includes an operational amplifier; The output terminal of the noise signal extraction module is electrically connected to the negative input terminal of the operational amplifier, and the output terminal of the laser peak power signal extraction module is electrically connected to the positive input terminal of the operational amplifier. The operational amplifier is used to compare and calculate the difference between the laser peak signal and the noise signal, and outputs the laser peak power after removing the noise component through the output terminal.

4. The laser peak power detection device according to claim 1, characterized in that, The noise signal extraction module further includes: a first amplification unit; The input terminal of the first amplification unit is electrically connected to the output terminal of the rectifier and filter unit, and the output terminal of the first amplification unit is electrically connected to the first input terminal of the signal-to-noise comparison and difference module. The first amplification unit is used to amplify the noise signal after it has been shaped and filtered.

5. The laser peak power detection device according to claim 1, characterized in that, The noise signal extraction module further includes: an AC coupling unit; The AC coupling unit is connected between the noise sampling amplification unit and the rectifier filter unit, and the AC coupling unit is used to couple the high-frequency AC signal in the noise signal to the rectifier filter unit.

6. The laser peak power detection device according to claim 4, characterized in that, The laser peak power signal extraction module includes a laser sampling amplification unit and a filtering unit; The input terminal of the laser sampling amplification unit is used to acquire laser signals, the output terminal of the laser sampling amplification unit is connected to the input terminal of the filtering unit, and the output terminal of the filtering unit is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The laser sampling and amplification unit is used to extract the laser peak signal and amplify the signal; The filtering unit is used to perform noise filtering on the amplified laser peak signal.

7. The laser peak power detection device according to claim 6, characterized in that, The laser peak power signal extraction module further includes: a second amplification unit; The input terminal of the second amplification unit is electrically connected to the output terminal of the filter unit, and the output terminal of the second amplification unit is electrically connected to the second input terminal of the signal-to-noise comparison and difference module. The second amplification unit is used to amplify the laser peak signal after noise filtering.

8. The laser peak power detection device according to claim 7, characterized in that, The signal amplification factor of the noise sampling amplification unit is equal to that of the laser sampling amplification unit; The signal amplification factor of the first amplification unit is equal to that of the second amplification unit.

9. A laser medical device, characterized in that, include: Laser, power supply circuit, and laser peak power detection device according to any one of claims 1-8; The noise signal extraction module is connected to the ground terminal of the power supply circuit, and the noise signal extraction module is used to extract noise signals from the ripple noise signal at the ground terminal of the power supply circuit. The laser peak power signal extraction module is used to extract the laser peak signal from the laser signal emitted by the laser.

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