WO2019127951A1

WO2019127951A1 - Method, apparatus and system for collecting terahertz time-domain pulse signal

Info

Publication number: WO2019127951A1
Application number: PCT/CN2018/080643
Authority: WO
Inventors: 刘小伟; 潘弈; 李辰; 丁庆; 冯军正
Original assignee: 深圳市太赫兹科技创新研究院; 深圳市太赫兹科技创新研究院有限公司
Priority date: 2017-12-29
Filing date: 2018-03-27
Publication date: 2019-07-04
Also published as: CN108303396A

Abstract

The present application relates to a method, apparatus and system for collecting a Terahertz time-domain pulse signal, and a storage medium and a computer device. The method comprises: issuing, according to a received external control message, a delay control instruction for controlling the state of a delay line; when the delay line is in an operating state, acquiring a Terahertz time-domain pulse signal and caching the Terahertz time-domain pulse signal in a preset data buffer queue; when the data buffer queue is in a saturated state, pushing a Terahertz time-domain pulse signal that has already been cached in the current data buffer queue; and returning to the step of caching the Terahertz time-domain pulse signal in a preset data buffer queue. According to the solution of the present application, by importing a collected pulse signal into a preset data buffer queue, and pushing pulse signal data out of the data buffer queue when the data buffer queue is saturated, the problems that a communication duration is long and unequal interval collection may be easily caused when directly pushing collected data are avoided, thereby realizing the quick and reliable collection of data.

Description

Terahertz time domain pulse signal acquisition method, device and system

Technical field

The present application relates to the field of terahertz time domain spectroscopy, and in particular to a terahertz time domain pulse signal acquisition method, apparatus, system, computer readable storage medium and computer device.

Background technique

The terahertz electromagnetic wave (THz) has a wavelength range of 0.03 to 3 mm, and the corresponding frequency range is 0.1 to 10 THz, which is between the microwave and the infrared. Because of its special position in the transition of electronics to photonics in the electromagnetic spectrum, it has the characteristics of strong penetrability, high spectral resolution and good safety. In recent years, its academic and application value has been widely concerned worldwide. Terahertz time-domain spectroscopy (THz-TDs) technology can simultaneously detect the amplitude and phase information of THz waves, showing great applications in many fields such as biomedicine, safety inspection, non-destructive testing, material property analysis, environment and food safety, communication, etc. The potential has rapidly evolved into a new and interesting research direction.

At present, the THz-TDS system has evolved from a bulky and cumbersome laboratory device to a compact and inexpensive practical spectrometer. In recent years, a lot of research has been done on the THz-TDS technology and its system instrumentation, and the terahertz time domain pulse signal is fast. Automated acquisition is one of the main problems that need to be solved in instrumentation applications. The traditional THz-TDS acquires the THz time-domain pulse signal acquisition data obtained by the lock-in amplifier (LIA) to the computer. The lock-in amplifier has a long communication time with the computer and the data collection efficiency is low. The data provided by the lock-in amplifier is single-point data, which is susceptible to noise and has limited data reliability.

Summary of the invention

Based on this, it is necessary to provide a megahertz time domain pulse signal acquisition method, device, system, computer readable storage medium and computer device with high collection efficiency and high reliability.

A terahertz time domain pulse signal acquisition method, comprising the steps of:

And sending a delay control instruction according to the received external control message, where the delay control instruction is used to control the state of the delay line;

When detecting that the delay line is in an active state, acquiring a terahertz time domain pulse signal, and buffering the terahertz time domain pulse signal into a preset data buffer queue;

When the data buffer queue is detected to be saturated, the buffered terahertz time domain pulse signal in the current data buffer queue is pushed;

Returns the step of buffering the terahertz time domain pulse signal into a preset data buffer queue.

In one embodiment, the delay control instruction includes an operational state control instruction or a reset control instruction.

In one embodiment, when detecting that the delay line is in an active state, acquiring the terahertz time domain pulse signal and buffering the terahertz time domain pulse signal into the preset data buffer queue includes:

Detecting a position level signal output by the delay line;

Collecting a terahertz time domain pulse signal when the position level signal is at a rising edge;

The terahertz time domain pulse signal is buffered into the first in first out queue.

In one embodiment, the step of buffering the terahertz time domain pulse signal into the first in first out queue includes performing analog to digital conversion on the terahertz time domain pulse signal.

In one embodiment, the step of returning the step of buffering the terahertz time domain pulse signal into the preset data buffer queue comprises:

The buffered terahertz time domain pulse signals in the current data buffer queue are stored in an external memory.

A terahertz time domain pulse signal collecting device, comprising:

a control instruction issuing module, configured to send a delay control instruction according to the received external control message, where the delay control instruction is used to control the state of the delay line;

a pulse signal acquisition module, configured to acquire a terahertz time domain pulse signal when the delay line is detected to be in an active state, and buffer the terahertz time domain pulse signal into a preset data buffer queue;

a pulse signal pushing module, configured to: when the data buffer queue is detected to be saturated, push the buffered terahertz time domain pulse signal in the current data buffer queue;

The continuous acquisition module is configured to return a step of buffering the terahertz time domain pulse signal into a preset data buffer queue.

A terahertz time domain pulse signal acquisition system comprising a lock-in amplifier, a delay line and a terahertz time domain pulse signal acquisition device as described above;

The terahertz time domain pulse signal acquisition device is connected to the lock-in amplifier and the delay line, respectively.

In one embodiment, further comprising at least one of an analog to digital converter, a delay line control device, and a flash memory;

The analog-to-digital converter is respectively connected to the terahertz time domain pulse signal collecting device and the lock-in amplifier;

The delay line control device is disposed on the connection node of the terahertz time domain pulse signal acquisition device and the delay line;

The flash memory is connected to the terahertz time domain pulse signal acquisition device.

A computer readable storage medium storing a computer program, when executed by a processor, causes the processor to perform the steps of the method as described above.

A computer apparatus comprising a memory and a processor, the memory storing a computer program, the computer program being executed by the processor, causing the processor to perform the steps of the method as described above.

The terahertz time domain pulse signal acquisition method, device, system, computer readable storage medium and computer device send a delay control instruction according to the received external control message to control the state of the delay line, when the delay line is detected When in the working state, the terahertz time domain pulse signal is acquired, and the terahertz time domain pulse signal is buffered into a preset data buffer queue. When the data buffer queue is detected to be saturated, the current data buffer queue is pushed. The buffered terahertz time domain pulse signal returns a step of buffering the terahertz time domain pulse signal into a preset data buffer queue. The solution of the present application introduces the collected terahertz time domain pulse signal into a preset data buffer queue, and pushes the terahertz time domain pulse signal out when the data buffer queue is saturated, thereby avoiding directly pushing the collected data. The long communication time is easy to cause non-equal interval acquisition problems, thus achieving fast and reliable collection of data.

DRAWINGS

1 is a schematic flow chart of a method for collecting a terahertz time domain pulse signal according to an embodiment of the present application;

2 is a schematic block diagram showing the structure of a terahertz time domain pulse signal collecting apparatus according to an embodiment of the present application;

3 is a schematic block diagram showing the structure of a terahertz time domain pulse signal acquisition system according to an embodiment of the present application;

4 is a schematic block diagram showing the structure of a terahertz time domain pulse signal acquisition system according to another embodiment of the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application.

FIG. 1 is a schematic flow chart of a method for collecting a terahertz time domain pulse signal according to an embodiment of the present application. As shown in FIG. 1, in this embodiment, a terahertz time domain pulse signal acquisition method includes:

Step S101: The delay control command is sent according to the received external control message, and the delay control command is used to control the state of the delay line.

The external control message can be received by wireless or wired communication, and the external control message can be sent by the server of the upper computer, generate a delay control instruction according to the received external message, and send the delay control command to the delay line to control the delay. The state of the line. Specifically, after receiving the external control message, the external control message is analyzed, and a delay control instruction is generated according to the analysis result and sent. The delay control instruction may include an operation state control instruction or a reset control instruction, respectively corresponding to the control delay line entering a corresponding working state or resetting, and returning to the initialization state.

Step S103: When detecting that the delay line is in an active state, acquiring a terahertz time domain pulse signal, and buffering the terahertz time domain pulse signal into a preset data buffer queue.

After the delay control command is issued, the state of the delay line is detected. When the delay line is detected to be in operation, the terahertz time domain pulse signal is acquired, and the terahertz time domain pulse signal is buffered to a preset data buffer queue. in. Specifically, when the delay line is in the working state, it indicates that the delay line is performing delay time control on the terahertz time domain pulse signal, and the terahertz time domain pulse signal is collected and buffered into a preset data buffer queue. The preset data buffer queue is used for temporarily buffering the collected terahertz time domain pulse signal, and the queue size can be set according to the acquisition period of the terahertz time domain pulse signal, such as setting the size to exactly correspond to one. The terahertz time domain pulse signal collected during the acquisition period, when the collected terahertz time domain pulse signal is introduced into the data buffer queue, the data buffer queue can just cover a complete acquisition cycle. In the specific implementation, the data buffer queue can be FIFO (First Input First Output) to ensure fast transfer of buffered data. Further, for the measurement of transient signals, there are generally two methods of real-time sampling and equivalent time sampling. Since the THz pulse generated by the femtosecond laser is on the order of picoseconds, the frequency is far beyond the response range of the general electronic device, so the recording The waveform of the electric field of the THz pulse with time is processed by the equivalent time sampling principle to obtain a complete THz time domain pulse.

Step S105: When the data buffer queue is detected to be in a saturated state, the buffered terahertz time domain pulse signal in the current data buffer queue is pushed.

When the obtained terahertz time domain pulse signal is buffered into the data buffer queue, the data buffer queue is monitored in real time to be saturated, that is, whether it is buffered or overflowed, and when the data buffer queue is detected to be saturated, the current data buffer is pushed. The terahertz time domain pulse signal that has been buffered in the queue. Specifically, when the data buffer queue is monitored to be saturated, the terahertz time domain pulse signal buffered in the data buffer queue is pushed to an external server to analyze the terahertz time domain pulse signal to realize terahertz time domain spectral detection. . In the specific application, if the data buffer queue is a FIFO, the terahertz time domain pulse signal that is first introduced is pushed according to the import time sequence, and then the terahertz time domain pulse signal is introduced after being pushed.

Step S107: Returning to the step of buffering the terahertz time domain pulse signal into a preset data buffer queue.

After the terahertz time domain pulse signal buffered in the data buffer queue is pushed, the step of buffering the terahertz time domain pulse signal into the preset data buffer queue is returned to re-import the collected terahertz time domain pulse signal into the data buffer. In the queue, continuous acquisition and push are implemented to obtain a complete terahertz time domain pulse signal.

The terahertz time domain pulse signal acquisition method sends a delay control command according to the received external control message to control the state of the delay line, and acquires a terahertz time domain pulse signal when the delay line is detected to be in an active state. The terahertz time domain pulse signal is buffered into a preset data buffer queue, and when the data buffer queue is detected to be saturated, the buffered terahertz time domain pulse signal in the current data buffer queue is pushed, and the terahertz is returned. The step of buffering the time domain pulse signal into a preset data buffer queue. The solution of this embodiment introduces the collected terahertz time domain pulse signal into a preset data buffer queue, and pushes the terahertz time domain pulse signal out when the data buffer queue is saturated, thereby avoiding directly collecting the data. The communication time is long when pushing, which easily leads to the problem of non-equal interval acquisition, thus realizing the fast and reliable collection of data.

Further, the delay control instruction includes an operation status control instruction or a reset control instruction.

Specifically, the external control message is received first, and may be received by a wireless communication method, such as a wireless local area network, a Bluetooth communication mode, or the like, or may be received by a wired communication method, such as an external control message sent by an external server through a network interface. More specifically, the network interface can be an RJ45 interface, and the RJ45 is a type of information socket (ie, communication terminal) connector in the wiring system. The connector is composed of a plug (connector, crystal head) and a socket (module), and the plug has 8 One groove and eight contacts. The received external control message is analyzed to generate a working state control command or a reset control command, wherein the working state control command is used to control the working state parameter of the delay line, such as the displacement amount, the stroke, the speed, etc., and the reset control command is used for controlling The delay line is reset and returns to the initialization state. Finally, the generated working state control instruction or the reset control instruction is issued, and the delayed control instruction includes a working state control instruction or a reset control instruction.

Further, when detecting that the delay line is in an active state, the step of acquiring the terahertz time domain pulse signal and buffering the terahertz time domain pulse signal into the preset data buffer queue may be performed by:

Detecting a position level signal output by the delay line;

After the delay control command is issued, the state of the delay line is detected, and the position level signal outputted by the delay line can be detected, and more specifically, the position level signal of the scale output of the delay line can be detected. When the position level signal is detected as a rising edge, that is, when the position level signal changes from a low level (number “0”) to a high level (number “1”), the terahertz time domain pulse signal acquisition is performed, and The acquired terahertz time domain pulse signal is buffered into the first in first out queue. The first in first out queue is used as the data buffer queue, and the queue size can be the same as the data collected in the acquisition period of a terahertz time domain pulse signal, so that the first in first out queue just covers a complete terahertz time domain pulse. Signal acquisition cycle.

Further, the step of buffering the terahertz time domain pulse signal into the first in first out queue includes: performing analog to digital conversion on the terahertz time domain pulse signal.

The acquired terahertz time domain pulse signal is an analog signal, and the first in first out queue is a digital signal buffer queue, so the terahertz time is obtained before the step of buffering the terahertz time domain pulse signal into the first in first out queue. The domain pulse signal is analog-to-digital converted to convert the analog terahertz time domain pulse signal into a digital terahertz time domain pulse signal, and the digital terahertz time domain pulse signal is used to be introduced into the first in first out queue.

Further, the step of returning the step of buffering the terahertz time domain pulse signal into the preset data buffer queue includes:

In the step of returning the buffer of the terahertz time domain pulse signal to the preset data buffer queue, the buffered terahertz time domain pulse signal in the current data buffer queue is stored in the external memory before the continuous acquisition. Specifically, the terahertz time domain pulse signal in the current data buffer queue may be stored in the external memory while the step of pushing the terahertz time domain pulse signal in the data buffer queue is performed, and the external memory may be a FLASH memory, that is, Flash memory; the terahertz time domain pulse signal in the data buffer queue can also be stored in an external memory before or after the step of pushing the terahertz time domain pulse signal in the data buffer queue to save the acquired signal in time. .

Based on the above terahertz time domain pulse signal acquisition method, the present application further provides a terahertz time domain pulse signal acquisition device.

FIG. 2 is a schematic block diagram showing the structure of a terahertz time domain pulse signal collecting apparatus 20 according to an embodiment of the present application. As shown in the figure, in the embodiment, the terahertz time domain pulse signal collecting device 20 includes:

The control instruction issuance module 201 is configured to issue a delay control instruction according to the received external control message, where the delay control instruction is used to control the state of the delay line;

The pulse signal acquisition module 203 is configured to: when detecting that the delay line is in an active state, acquire a terahertz time domain pulse signal, and buffer the terahertz time domain pulse signal into a preset data buffer queue;

The pulse signal pushing module 205 is configured to: when the data buffer queue is detected to be in a saturated state, push the buffered terahertz time domain pulse signal in the current data buffer queue;

The continuous acquisition module 207 is configured to return a step of buffering the terahertz time domain pulse signal into a preset data buffer queue.

The terahertz time domain pulse signal collecting device sends a delay control command according to the received external control message to control the state of the delay line, and the pulse signal collecting module detects that the delay line is working. In the state, the terahertz time domain pulse signal is collected, and the terahertz time domain pulse signal is buffered into a preset data buffer queue, and the current data buffer queue is pushed by the pulse signal pushing module when the data buffer queue is detected to be saturated. The buffered terahertz time domain pulse signal returns a step of buffering the terahertz time domain pulse signal into a preset data buffer queue through the continuous acquisition module. The solution of this embodiment introduces the collected terahertz time domain pulse signal into a preset data buffer queue, and pushes the terahertz time domain pulse signal out when the data buffer queue is saturated, thereby avoiding directly collecting the data. The communication time is long when pushing, which easily leads to the problem of non-equal interval acquisition, thus realizing the fast and reliable collection of data.

Based on the above terahertz time domain pulse signal acquisition method and apparatus, the present application also provides a terahertz time domain pulse signal acquisition system.

FIG. 3 is a schematic block diagram showing the structure of a terahertz time domain pulse signal acquisition system according to an embodiment of the present application. As shown in FIG. 3, in this embodiment, the terahertz time domain pulse signal acquisition system includes a lock-in amplifier 301, a delay line 302, and a terahertz time domain pulse signal acquisition device 20 as described above;

The terahertz time domain pulse signal acquisition device 20 is coupled to a lock-in amplifier 301 and a delay line 302, respectively.

Specifically, the lock-in amplifier 301 is an amplifier that performs phase-sensitive detection on an alternating signal, and uses a reference signal having the same frequency and phase relationship with the measured signal as a comparison reference, only for the measured signal itself and those with reference. The signal is responsive to the same frequency (or multiplication) and in-phase noise components. Therefore, the lock-in amplifier 301 can greatly suppress unwanted noise and improve the detection signal-to-noise ratio. In addition, the lock-in amplifier 301 has high detection sensitivity and simple signal processing, and is an effective method for detecting weak light signals. The delay line 302 is used to delay the electrical signal for a period of time. The delay line 302 has a flat amplitude frequency characteristic and a certain phase shift characteristic (or delay frequency characteristic) in the pass band, and has an appropriate matching impedance and a small attenuation. The delay line 302 is typically composed of an inductor and a capacitor for the analog signal or directly with a coaxial cable and a spiral. Delay line 302 is widely used in radars, electronic computers, color television systems, communication systems, and measuring instruments such as oscilloscopes. Specifically, the delay line 302 may include an optical delay line, and the motion of the delay line 302 may be controlled by a delay line control device. More specifically, the delay line control device may include a voice coil motor for controlling the displacement amount of the delay line 302 and speed.

The terahertz time domain pulse signal acquisition system sends a delay control command according to the received external control message to control the state of the delay line when the delay line is in operation. The terahertz time domain pulse signal is collected by the lock-in amplifier, and the terahertz time domain pulse signal collected by the lock-in amplifier is buffered into a preset data buffer queue, and when the data buffer queue is detected to be saturated, the current data is pushed. The buffered terahertz time domain pulse signal in the buffer queue returns the step of buffering the terahertz time domain pulse signal into a preset data buffer queue. The scheme of the embodiment controls the delay line motion, and the terahertz time domain pulse signal is collected by the lock-in amplifier during the delay line motion, and the terahertz time domain pulse signal collected by the lock-in amplifier is introduced into the preset data buffer queue. In the data buffer queue saturation, the terahertz time domain pulse signal is pushed out, which avoids the long communication time when the collected data is directly pushed, which easily leads to the problem of non-equal interval acquisition, thereby realizing the rapid data acquisition. Reliable collection.

Further, the terahertz time domain pulse signal acquisition system of the present application may further include an analog to digital converter connected to the terahertz time domain pulse signal acquisition device 20 and the lock phase amplifier 301, respectively.

The analog-to-digital converter is respectively connected to the terahertz time domain pulse signal collecting device 20 and the lock-in amplifier 301, and performs analog-to-digital conversion on the analog terahertz time domain pulse signal collected by the lock-in amplifier 301 to obtain a digital terahertz time domain pulse signal. The digital terahertz time domain pulse signal is sent to the terahertz time domain pulse signal acquisition device 20.

Further, the terahertz time domain pulse signal acquisition system of the present application may further include a delay line control device provided on the connection node of the terahertz time domain pulse signal acquisition device 20 and the delay line 302.

The delay line control device is disposed between the terahertz time domain pulse signal acquisition device 20 and the lock-in amplifier 301 for receiving the delay control command sent by the terahertz time domain pulse signal acquisition device 20 and correspondingly controlling the delay line 302. In a particular application, the delay line control device can be a voice coil motor for controlling the amount and speed of displacement of the delay line 302.

Further, the terahertz time domain pulse signal acquisition system of the present application may further include a flash memory connected to the terahertz time domain pulse signal acquisition device 20.

Flash memory, that is, FLASH memory is a non-volatile memory that can maintain the stored data information in the case of power failure. The flash memory access speed is fast, no noise, and the heat dissipation is small, and the terahertz time domain pulse can be realized. Fast storage of signals.

4 is a schematic block diagram showing the structure of a terahertz time domain pulse signal acquisition system according to another embodiment of the present application. As shown in FIG. 4, in the embodiment, the terahertz time domain pulse signal acquisition system includes an FPGA (Field-Programmable Gate Array) as a terahertz time domain pulse signal acquisition device, and a built-in pre-input in the FPGA. First-out queue FIFO, AD/DC adapter, ie AC-DC power adapter, network interface RJ45 connected to external server, flash memory FALSH, delay line control, optical delay line, analog-to-digital converter ADC, lock-in amplifier LIA and preamplifier PreAMP;

The FIFO is connected to the ADC, RJ45 and FLASH respectively. The FPGA is also connected to the ADC, LIA, PreAMP, delay line control device and AD/DC adapter respectively. The ADC, LIA and PreAMP are connected in turn, and the optical delay line is connected with the delay line control device. .

Specifically, the FPGA acts as a data acquisition control center, and the FPGA can be an XILINX-based FPGA. In order to avoid non-equal interval sampling caused by the lock-in amplifier (LIA) and the host computer, ie, server communication, the system uses 18-bit high-speed ADC to store data synchronously with FLASH in the FPGA, and converts the ADC at the same time. The data is placed in a FIFO (first in first out queue) with a depth of 20K, so that it covers exactly one complete acquisition cycle. When the FIFO is full, the RJ45 is uploaded to the server through the Gigabit Ethernet port. In addition, the LIA is connected to the IO port of the FPGA, and the FPGA sends the setting parameters through the IO port to realize the control of the LIA, and the optical delay line is directly controlled by the delay line control device, and the delay line control device can be a voice coil motor. After the system is initialized, the external server sends an external control message through the physical layer PHY chip, and sends it to the FPGA through the network interface RJ45. The external control message is parsed by the FPGA to obtain the displacement amount and speed set in the external control message, thereby controlling the voice coil motor. The movement and simultaneous data collection. Among them, the displacement of the voice coil motor determines the amount of data acquisition. The larger the displacement of the voice coil motor is, the larger the data acquisition amount is. The speed of the voice coil motor determines the data acquisition speed, and the speed of the voice coil motor is larger. The faster the data collection speed.

When the terahertz time domain pulse signal acquisition system of the embodiment performs the terahertz time domain pulse signal acquisition, after the FPGA receives the external control message, the delay control command is issued to control the motion of the optical delay line, including the speed and the stroke setting. And the reset of the output state of the optical delay line. The optical delay line control device directly feeds back the position level signal output from the scale to the FPGA, and performs data acquisition when detecting the rising edge of the position level of the scale output of the delay line device, thereby achieving the effect of closed loop control. In the process of controlling the optical delay line, it can be known from the principle of equivalent time sampling that in order to obtain a complete pulse waveform of the THz period, it is necessary to change the time delay in the sampling interval of the sampling shock sequence. In this embodiment, the relative delay of the pump pulse light and the probe pulse light is adjusted by the optical delay line to obtain the intensity of different positions of the THz pulse, so that the entire terahertz time domain waveform can be detected. The motion control of the optical delay line often determines the speed and acquisition amount of the THz time domain pulse data acquisition, and then determines the detection time and resolution of the THz-TDS system. The step of continuous acquisition by the voice coil motor may be: after the system is initialized, the movement is performed according to the set speed and the stroke control delay line, and data acquisition is performed at the same time, and the data acquisition occurs in the whole process of the optical delay line movement. The analog signal after phase-locked amplification is converted by a high-speed ADC. The sampling rate can be from 20KHz to 500KHz. A large amount of data can be collected in a short time. After the data acquisition is started, the analog signal is phase-locked and amplified, and then converted to the FPGA through AD conversion. The FIFO buffer can buffer the data of one scan period and then write it to the FLASH. At the same time, it can be directly uploaded to the server for analysis through the Gigabit Ethernet port. The terahertz time-domain pulse signal acquisition system of the embodiment can realize data acquisition of up to 500KHz, and the single-step continuous acquisition of 1000 data time is only 83.33ms in the step size of 4um, which can perform fast and high precision on the terahertz time domain pulse signal. Acquisition.

Based on the above terahertz time domain pulse signal acquisition method, apparatus and system, the present application also provides a computer readable storage medium and a computer device.

In one embodiment, a computer readable storage medium of the present application stores a computer program that, when executed by a processor, causes the processor to perform the steps of the terahertz time domain pulse signal acquisition method as described above.

In one embodiment, a computer device of the present application includes a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform terahertz as described above The steps of the domain pulse signal acquisition method.

One of ordinary skill in the art can understand that all or part of the process of implementing the above embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a non-volatile computer readable storage medium. Wherein, the program, when executed, may include the flow of an embodiment of the methods as described above. Any reference to a memory, storage, database or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of formats, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronization chain. Synchlink DRAM (SLDRAM), Memory Bus (Rambus) Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM).

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-mentioned embodiments are merely illustrative of several embodiments of the present application, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present application. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A terahertz time domain pulse signal acquisition method, comprising the steps of:

And sending a delay control instruction according to the received external control message, where the delay control instruction is used to control a state of the delay line;

When detecting that the delay line is in an active state, acquiring a terahertz time domain pulse signal, and buffering the terahertz time domain pulse signal into a preset data buffer queue;

When the data buffer queue is detected to be in a saturated state, the terahertz time domain pulse signal that is buffered in the current data buffer queue is pushed;

Returning to the step of buffering the terahertz time domain pulse signal into a preset data buffer queue.
The method of claim 1 wherein said delay control command comprises said operational state control command or said reset control command.
The method according to claim 1, wherein when detecting that the delay line is in an active state, acquiring a terahertz time domain pulse signal and buffering the terahertz time domain pulse signal to a preset The steps in the data buffer queue include:

Detecting a position level signal output by the delay line;

Collecting a terahertz time domain pulse signal when the position level signal is at a rising edge;

The terahertz time domain pulse signal is buffered into a first in first out queue.
The method according to claim 3, wherein said step of buffering said terahertz time domain pulse signal into said first in first out queue comprises: performing analog to digital conversion on said terahertz time domain pulse signal.
The method of claim 1 wherein said step of returning said step of buffering said terahertz time domain pulse signal into a predetermined data buffer queue comprises:

The terahertz time domain pulse signal that has been buffered in the current data buffer queue is stored in an external memory.
A terahertz time domain pulse signal collecting device, comprising:

And a control instruction issuing module, configured to send a delay control instruction according to the received external control message, where the delay control instruction is used to control a state of the delay line;

a pulse signal acquisition module, configured to: when detecting that the delay line is in an active state, acquire a terahertz time domain pulse signal, and buffer the terahertz time domain pulse signal into a preset data buffer queue;

a pulse signal pushing module, configured to: when the data buffer queue is detected to be in a saturated state, push the buffered terahertz time domain pulse signal in the current data buffer queue;

And a continuous acquisition module, configured to return to the step of buffering the terahertz time domain pulse signal into a preset data buffer queue.
A terahertz time domain pulse signal acquisition system, comprising: a lock-in amplifier, a delay line, and the terahertz time domain pulse signal acquisition device according to claim 6;

The terahertz time domain pulse signal acquisition device is coupled to the lock-in amplifier and the delay line, respectively.
The system of claim 7 further comprising at least one of an analog to digital converter, a delay line control device, and a flash memory;

The analog-to-digital converter is respectively connected to the terahertz time domain pulse signal collecting device and the lock-in amplifier;

The delay line control device is disposed on the connection node of the terahertz time domain pulse signal acquisition device and the delay line;

The flash memory is coupled to the terahertz time domain pulse signal acquisition device.
A computer readable storage medium storing a computer program, when executed by a processor, causes the processor to perform the steps of the method of any one of claims 1 to 5.
A computer device comprising a memory and a processor, the memory storing a computer program, the computer program being executed by the processor, causing the processor to perform the method of any one of claims 1 to 5. A step of.