Medical laser pulse width error measurement system

Abstract

The invention provides a medical laser pulse width error measurement system which comprises a laser control and drive module, a laser, a PD detector and a pulse width error detection module. The pulse width error detection module comprises a first pulse width conversion circuit, a second pulse width conversion circuit, a modulation circuit and an operational amplifier circuit module, the laser control and driving module is electrically connected with the laser, and the PD detector is connected with the laser. A signal modulation circuit of the pulse width error detection module is electrically connected between the PD detector and the first pulse width conversion circuit, the first pulse width conversion circuit and the second pulse width conversion circuit are both electrically connected with the operational amplifier circuit module, and the laser control and drive module is electrically connected with the second pulse width conversion circuit. The deviation of the original pulse signal is finely adjusted according to the comparison result, so that the laser pulse error is controlled within the set 10%.

Description

Technical Field

[0001] The invention relates to the technical field of laser treatment equipment, and in particular to a medical laser pulse width error measurement system. Background Art

[0002] Laser therapy has become one of the most widely used treatment methods. Lasers are widely used in medical applications. Generally, laser therapy equipment may have deviations in pulse signal output power during use, and it is necessary to control the deviation of pulse signal output power within the allowable range. Since pulse signal width measurement is difficult, existing laser therapy equipment lacks the function of real-time measurement of pulse width deviation.

[0003] In view of this, it is necessary to provide a medical laser pulse width error measurement system to overcome the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to provide a medical laser pulse width error measurement system, which can fine-tune the deviation of the original pulse signal according to the comparison result, so that the laser pulse error is controlled within a set 10%.

[0005] In order to achieve the above-mentioned purpose, the technical solution proposed by the present invention is as follows: a medical laser pulse width error measurement system, comprising: a laser control and drive module, a laser, a PD detector and a pulse width error detection module; the pulse width error detection module comprises a pulse width conversion circuit 1, a pulse width conversion circuit 2, a modulation circuit and an operational amplifier circuit module,

[0006] The laser control and drive module is electrically connected to the laser, the PD detector is connected to the laser, the signal modulation circuit of the pulse width error detection module is electrically connected between the PD detector and pulse width conversion circuit 1, the pulse width conversion circuit 1 and the pulse width conversion circuit 2 are both electrically connected to the operational amplifier circuit module, and the laser control and drive module is electrically connected to pulse width conversion circuit 2.

[0007] Preferably, the pulse width conversion circuit 1 includes a resistor R20, a capacitor C20, a single-chip computer U1, a capacitor C21, a resistor R22 and a resistor R21; a first end of the resistor R20 is electrically connected to the signal modulation circuit and the PWM pin of the single-chip computer U1, a second end of the resistor R20 is grounded, a VCC pin of the single-chip computer U1 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C20,

[0008] The O5V pin of the single-chip computer U1 is electrically connected to the first end of the capacitor C21, the second end of the capacitor C21 is grounded, the SEL pin of the single-chip computer U1 is electrically connected to the first end of the resistor R22, the second end of the resistor R22 is electrically connected to the second end of the capacitor C21,

[0009] The VOUT pin of the single-chip computer U1 is electrically connected to the first end of the resistor R21 and the operational amplifier circuit module, and the GND pin of the single-chip computer U1 is electrically connected to the second end of the resistor R21 and is grounded.

[0010] Preferably, the pulse width conversion circuit 2 includes a resistor R30, a capacitor C30, a single-chip computer U2, a capacitor C31, a resistor R32 and a resistor R31, the first end of the resistor R30 is electrically connected to the laser control and drive module and the PWM pin of the single-chip computer U2, the second end of the resistor R30 is grounded, the VCC pin of the single-chip computer U2 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C30, the second end of the capacitor C30 is grounded, the O5V pin of the single-chip computer is electrically connected to the first end of the capacitor C31, the second end of the capacitor C31 is grounded, the SEL pin of the single-chip computer U2 is electrically connected to the first end of the resistor R32, the second end of the resistor R32 is electrically connected to the second end of the capacitor C31,

[0011] The VOUT pin of the single-chip computer U2 is electrically connected to the first end of the resistor R31 and the operational amplifier circuit module, and the GND pin of the single-chip computer U2 is electrically connected to the second end of the resistor R31 and is grounded.

[0012] Preferably, the operational amplifier circuit module includes a resistor R42, a capacitor C43, a resistor R43, an operational amplifier U3A, a capacitor C42, a resistor R41, a capacitor C40, a resistor R44, a capacitor C44, a resistor R45 and a resistor R46.

[0013] The first end of the resistor R42 is electrically connected to the VOUT pin of the single-chip computer U1, the second end of the resistor R42 is electrically connected to the first end of the capacitor C43, the first end of the resistor R43 and the reverse input end of the operational amplifier U3A, the first end of the resistor R40 is electrically connected to the VOUT pin of the single-chip computer U2, the second end of the resistor R40 is electrically connected to the first end of the capacitor C42, the first end of the resistor R41 and the same-direction input end of the operational amplifier U3A, the output end of the operational amplifier U3A is electrically connected to the first end of the resistor R44, the second end of the resistor R44 is electrically connected to the first end of the capacitor C44, the first end of the resistor R45 and the first end of the resistor R46, the second end of the capacitor C44 is electrically connected to the second end of the resistor R41 and the negative pole of the operational amplifier U3A and is grounded, the positive pole of the operational amplifier U3A is connected to a +5V DC power supply and is electrically connected to the first end of the capacitor C40, and the second end of the capacitor C40 is grounded.

[0014] Preferably, the medical laser pulse width error measurement system further comprises a human-computer interaction terminal, and the human-computer interaction terminal is electrically connected to the laser control and drive module.

[0015] Preferably, the medical laser pulse width error measurement system further comprises a matrix keyboard, and the matrix keyboard is electrically connected to the laser control and drive module.

[0016] Preferably, the medical laser pulse width error measurement system further comprises an alarm module, which is disposed inside the human-computer interaction terminal and is electrically connected to the laser control and drive module.

[0017] Preferably, the medical laser pulse width error measurement system further comprises an indicator light, and the indicator light is electrically connected to the laser control and driving module and the second end of the resistor R46 of the operational amplifier circuit module.

[0018] Preferably, the medical laser pulse width error measurement system further comprises a laser attenuator, and the laser attenuator is arranged between the laser and the PD detector.

[0019] Preferably, the wavelength of the laser is 800nm~1550nm, the pulse energy of the laser is 1uJ~100mJ, and the pulse width of the laser is 10ns~1ms; the operational amplifier is a high-precision operational amplifier, and its product model may be MS8601; the operating wavelength of the PD detector is 800nm~1700nm, and the bandwidth of the PD detector is 2GHz.

[0020] Compared with the prior art, the beneficial effect lies in that after receiving the optical signal, the PD detector converts the optical signal into peak power and pulse width signal (electrical signal) and sends it to the pulse width error detection module, the pulse width conversion circuit 1 and the pulse width conversion circuit 2 respectively output the laser pulse width signal and the original pulse width signal to the operational amplifier, the operational amplifier outputs the amplified error signal to the laser control and drive module for sampling and comparison, the laser control and drive module fine-tunes the deviation of the original pulse signal according to the comparison result, so that the laser pulse error is controlled to within the set 10%, and the laser can be measured and the error can be controlled within a certain range.

[0021] Other features and advantages of the present invention will be set forth in the following description, and part will be apparent from the description, or may be understood through the practice of the present invention. The features and advantages of the present invention may be realized and obtained through the elements and combinations specifically indicated in the appended application scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a principle block diagram of the medical laser pulse width error measurement system provided by the present invention.

[0024] Figure 2 This is the principle block diagram of the pulse width error detection module of the medical laser pulse width error measurement system.

[0025] Figure 3 The circuit diagram of pulse width conversion circuit 1 of the medical laser pulse width error measurement system is shown in FIG.

[0026] Figure 4 The circuit diagram of module conversion circuit 2 of the medical laser pulse width error measurement system.

[0027] Figure 5 The circuit diagram of the operational amplifier circuit module of the medical laser pulse width error measurement system. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0029] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be determined according to the specific circumstances.

[0031] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" refers to two or more, unless otherwise clearly and specifically defined.

[0032] See also Figures 1 to 5 The present invention proposes a medical laser pulse width error measurement system, comprising: a laser control and drive module, a laser, a PD detector and a pulse width error detection module; the pulse width error detection module comprises a pulse width conversion circuit 1, a pulse width conversion circuit 2, a modulation circuit and an operational amplifier circuit module,

[0033] The laser control and drive module is electrically connected to the laser, the PD detector is connected to the laser, the signal modulation circuit of the pulse width error detection module is electrically connected between the PD detector and pulse width conversion circuit 1, the pulse width conversion circuit 1 and the pulse width conversion circuit 2 are both electrically connected to the operational amplifier circuit module, and the laser control and drive module is electrically connected to pulse width conversion circuit 2.

[0034] The laser control and drive module controls the laser to generate laser light. After receiving the optical signal, the PD detector converts the optical signal into a peak power and pulse width signal (electrical signal) and sends it to the pulse width error detection module.

[0035] The signal modulation circuit of the pulse width error detection module adjusts the peak power and the pulse width signal, and outputs a pulse width signal with a constant amplitude to the pulse width conversion circuit 1. At the same time, the laser control and drive module outputs the original pulse signal of the laser drive to the pulse width conversion circuit 2 of the pulse width error detection module, and the electrical parameters of the pulse width conversion circuit 1 and the pulse width conversion circuit 2 are consistent.

[0036] Pulse width conversion circuit 1 and pulse width conversion circuit 2 respectively output pulse width conversion signal and original pulse width signal to operational amplifier circuit module, the operational amplifier circuit module outputs amplified error signal to laser control and drive module for sampling and comparison, the laser control and drive module fine-tunes the deviation of original pulse signal according to the comparison result, so that the laser pulse error is controlled within the set 10%.

[0037] It should be noted that, in this embodiment, the wavelength of the laser is 800nm~1550nm, the pulse energy of the laser is 1uJ~100mJ, and the pulse width of the laser is 10ns~1ms; the operational amplifier is a high-precision operational amplifier, its product model may be MS8601, and the amplification speed is about 2 times; the operating wavelength of the PD detector is 800nm~1700nm, and the bandwidth of the photodetector PD is 2GHz.

[0038] In a preferred embodiment, the pulse width conversion circuit 1 includes a resistor R20, a capacitor C20, a single-chip microcomputer U1, a capacitor C21, a resistor R22 and a resistor R21; the first end of the resistor R20 is electrically connected to the signal modulation circuit and the PWM pin of the single-chip microcomputer U1, the second end of the resistor R20 is grounded, the VCC pin of the single-chip microcomputer U1 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C20,

[0039] The O5V pin of the single-chip computer U1 is electrically connected to the first end of the capacitor C21, the second end of the capacitor C21 is grounded, the SEL pin of the single-chip computer U1 is electrically connected to the first end of the resistor R22, the second end of the resistor R22 is electrically connected to the second end of the capacitor C21,

[0040] The VOUT pin of the single-chip computer U1 is electrically connected to the first end of the resistor R21 and the operational amplifier circuit module, and the GND pin of the single-chip computer U1 is electrically connected to the second end of the resistor R21 and is grounded.

[0041] In this way, after receiving the optical signal, the PD detector converts the optical signal into peak power and pulse width signal (electrical signal) and sends it to the pulse width error detection module.

[0042] The signal modulation circuit of the pulse width error detection module adjusts the peak power and the pulse width signal, and outputs a pulse width signal PD_PWM with a constant amplitude to the pulse width conversion circuit 1. The pulse width conversion circuit 1 outputs a laser pulse width conversion signal PD_PA to the operational amplifier circuit module. The operational amplifier circuit module outputs the amplified error signal to the laser control and drive module for sampling and comparison.

[0043] In a preferred embodiment, the pulse width conversion circuit 2 includes a resistor R30, a capacitor C30, a single-chip computer U2, a capacitor C31, a resistor R32 and a resistor R31, the first end of the resistor R30 is electrically connected to the laser control and drive module and the PWM pin of the single-chip computer U2, the second end of the resistor R30 is grounded, the VCC pin of the single-chip computer U2 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C30, the second end of the capacitor C30 is grounded, the O5V pin of the single-chip computer is electrically connected to the first end of the capacitor C31, the second end of the capacitor C31 is grounded, the SEL pin of the single-chip computer U2 is electrically connected to the first end of the resistor R32, the second end of the resistor R32 is electrically connected to the second end of the capacitor C31,

[0044] The VOUT pin of the single-chip computer U2 is electrically connected to the first end of the resistor R31 and the operational amplifier circuit module, and the GND pin of the single-chip computer U2 is electrically connected to the second end of the resistor R31 and is grounded.

[0045] It should be noted that, in the present embodiment, the product models of the single-chip microcomputer U1 and the single-chip microcomputer U2 are both GP8101, which is a symmetrical design, which is conducive to optimizing common-mode interference and improving the stability and accuracy of measurement.

[0046] In this way, the laser control and drive module outputs the original pulse signal of laser drive to the pulse width conversion circuit 2 of the pulse width error detection module, and the pulse width conversion circuit 2 outputs the pulse width conversion signal PD_PA after the original pulse width signal is converted to the operational amplifier circuit module, and the operational amplifier circuit module outputs the amplified error signal to the laser control and drive module for sampling and comparison, and the laser control and drive module fine-tunes the deviation of the original pulse signal according to the comparison result, so that the laser pulse error is controlled to within the set 10%.

[0047] In a preferred embodiment, the operational amplifier circuit module includes a resistor R42, a capacitor C43, a resistor R43, an operational amplifier U3A, a capacitor C42, a resistor R41, a capacitor C40, a resistor R44, a capacitor C44, a resistor R45 and a resistor R46.

[0048] The first end of the resistor R42 is electrically connected to the VOUT pin of the single-chip computer U1, the second end of the resistor R42 is electrically connected to the first end of the capacitor C43, the first end of the resistor R43 and the reverse input terminal (-) of the operational amplifier U3A, the first end of the resistor R40 is electrically connected to the VOUT pin of the single-chip computer U2, the second end of the resistor R40 is electrically connected to the first end of the capacitor C42, the first end of the resistor R41 and the same-direction input terminal (+) of the operational amplifier U3A, the output terminal of the operational amplifier U3A is electrically connected to the first end of the resistor R44, the second end of the resistor R44 is electrically connected to the first end of the capacitor C44, the first end of the resistor R45 and the first end of the resistor R46, the second end of the capacitor C44 is electrically connected to the second end of the resistor R41 and the negative pole of the operational amplifier U3A and is grounded, the positive pole of the operational amplifier U3A is connected to the +5V DC power supply and is electrically connected to the first end of the capacitor C40, and the second end of the capacitor C40 is grounded.

[0049] Thus, the output end of the operational amplifier U3A outputs the amplified pulse width conversion signal to the laser control and drive module for sampling and comparison. The laser control and drive module fine-tunes the deviation of the original pulse signal according to the comparison result to control the laser pulse error to within the set 10%.

[0050] In a preferred embodiment, the medical laser pulse width error measurement system further comprises a human-machine interaction terminal, and the human-machine interaction terminal is electrically connected to the laser control and drive module. It should be noted that, in this embodiment, the human-machine interaction terminal can be a touch screen. Clicking an icon on the touch screen can issue instructions to the laser control and drive module.

[0051] In a preferred embodiment, the medical laser pulse width error measurement system further comprises a matrix keyboard, and the matrix keyboard is electrically connected to the laser control and drive module. By pressing a button on the matrix keyboard, an instruction can be issued to the laser control and drive module.

[0052] In a preferred embodiment, the medical laser pulse width error measurement system further includes an alarm module, which is disposed inside the human-computer interaction terminal and is electrically connected to the laser control and drive module.

[0053] It should be noted that, in this embodiment, the alarm module may be a buzzer. When a fault occurs, the alarm module in the human-computer interaction terminal may sound an alarm. At the same time, the human-computer interaction terminal itself may display and record fault information for user convenience.

[0054] In a preferred embodiment, the medical laser pulse width error measurement system also includes an indicator light, which is electrically connected to the laser control and drive module and the second end of the resistor R46 of the operational amplifier circuit module, and the indicator light can light up and flash according to the working status of the medical laser pulse width error measurement system.

[0055] Since the indicator light is electrically connected to the laser control and drive module, the output end of the operational amplifier U3A outputs the amplified pulse width conversion signal to the laser control and drive module for sampling and comparison. When the medical laser pulse width error measurement system is in a normal working state, the indicator light is blue, and when the medical laser pulse width error measurement system is in an abnormal working state, the indicator light is red.

[0056] In a preferred embodiment, the medical laser pulse width error measurement system further includes a laser attenuator, which is arranged between the laser and the PD detector. After the laser generated by the laser irradiates the laser attenuator, the laser attenuator adjusts the penetration rate and emission angle of the laser so that the PD detector can more easily detect the laser beam.

[0057] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A medical laser pulse width error measurement system, characterized in that: include: Laser control and drive module, laser, PD detector and pulse width error detection module; the pulse width error detection module includes pulse width conversion circuit 1, pulse width conversion circuit 2, modulation circuit and operational amplifier circuit module, The laser control and drive module is electrically connected to the laser, the PD detector is connected to the laser, the signal modulation circuit of the pulse width error detection module is electrically connected between the PD detector and pulse width conversion circuit 1, the pulse width conversion circuit 1 and the pulse width conversion circuit 2 are both electrically connected to the operational amplifier circuit module, and the laser control and drive module is electrically connected to pulse width conversion circuit 2.

2. The medical laser pulse width error measurement system according to claim 1, characterized in that: The pulse width conversion circuit 1 includes a resistor R20, a capacitor C20, a single-chip computer U1, a capacitor C21, a resistor R22 and a resistor R21; a first end of the resistor R20 is electrically connected to the signal modulation circuit and the PWM pin of the single-chip computer U1, a second end of the resistor R20 is grounded, a VCC pin of the single-chip computer U1 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C20, The O5V pin of the single-chip computer U1 is electrically connected to the first end of the capacitor C21, the second end of the capacitor C21 is grounded, the SEL pin of the single-chip computer U1 is electrically connected to the first end of the resistor R22, the second end of the resistor R22 is electrically connected to the second end of the capacitor C21, The VOUT pin of the single-chip computer U1 is electrically connected to the first end of the resistor R21 and the operational amplifier circuit module, and the GND pin of the single-chip computer U1 is electrically connected to the second end of the resistor R21 and is grounded.

3. The medical laser pulse width error measurement system according to claim 2, characterized in that: The pulse width conversion circuit 2 includes a resistor R30, a capacitor C30, a single-chip computer U2, a capacitor C31, a resistor R32 and a resistor R31. The first end of the resistor R30 is electrically connected to the laser control and drive module and the PWM pin of the single-chip computer U2, the second end of the resistor R30 is grounded, the VCC pin of the single-chip computer U2 is connected to a +12V DC power supply and is electrically connected to the first end of the capacitor C30, the second end of the capacitor C30 is grounded, the O5V pin of the single-chip computer is electrically connected to the first end of the capacitor C31, the second end of the capacitor C31 is grounded, the SEL pin of the single-chip computer U2 is electrically connected to the first end of the resistor R32, the second end of the resistor R32 is electrically connected to the second end of the capacitor C31, The VOUT pin of the single-chip computer U2 is electrically connected to the first end of the resistor R31 and the operational amplifier circuit module, and the GND pin of the single-chip computer U2 is electrically connected to the second end of the resistor R31 and is grounded.

4. The medical laser pulse width error measurement system according to claim 2, characterized in that: The operational amplifier circuit module includes a resistor R42, a capacitor C43, a resistor R43, an operational amplifier U3A, a capacitor C42, a resistor R41, a capacitor C40, a resistor R44, a capacitor C44, a resistor R45 and a resistor R46. The first end of the resistor R42 is electrically connected to the VOUT pin of the single-chip computer U1, the second end of the resistor R42 is electrically connected to the first end of the capacitor C43, the first end of the resistor R43 and the reverse input end of the operational amplifier U3A, the first end of the resistor R40 is electrically connected to the VOUT pin of the single-chip computer U2, the second end of the resistor R40 is electrically connected to the first end of the capacitor C42, the first end of the resistor R41 and the same-direction input end of the operational amplifier U3A, the output end of the operational amplifier U3A is electrically connected to the first end of the resistor R44, the second end of the resistor R44 is electrically connected to the first end of the capacitor C44, the first end of the resistor R45 and the first end of the resistor R46, the second end of the capacitor C44 is electrically connected to the second end of the resistor R41 and the negative pole of the operational amplifier U3A and is grounded, the positive pole of the operational amplifier U3A is connected to the +5V DC power supply and is electrically connected to the first end of the capacitor C40, and the second end of the capacitor C40 is grounded.

5. The medical laser pulse width error measurement system according to claim 1, characterized in that: The medical laser pulse width error measurement system further comprises a human-machine interaction terminal, and the human-machine interaction terminal is electrically connected to the laser control and driving module.

6. The medical laser pulse width error measurement system according to claim 2, characterized in that: The medical laser pulse width error measurement system further includes a matrix keyboard, which is electrically connected to the laser control and drive module.

7. The medical laser pulse width error measurement system according to claim 5, characterized in that: The medical laser pulse width error measurement system further comprises an alarm module, which is arranged inside the human-computer interaction terminal and is electrically connected to the laser control and drive module.

8. The medical laser pulse width error measurement system according to claim 4, characterized in that: The medical laser pulse width error measurement system further includes an indicator light, which is electrically connected to the laser control and drive module and the second end of the resistor R46 of the operational amplifier circuit module.

9. The medical laser pulse width error measurement system according to claim 1, characterized in that: The medical laser pulse width error measurement system further includes a laser attenuator, which is arranged between the laser and the PD detector.

10. The medical laser pulse width error measurement system according to claim 1, characterized in that: The wavelength of the laser is 800nm~1550nm, the pulse energy of the laser is 1uJ~100mJ, and the pulse width of the laser is 10ns~1ms; the operational amplifier is a high-precision operational amplifier, and its product model can be MS8601; the operating wavelength of the PD detector is 800nm~1700nm, and the bandwidth of the PD detector is 2GHz.

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