CN221101039U

CN221101039U - Erbium glass solid laser ranging received signal constant ratio circuit

Info

Publication number: CN221101039U
Application number: CN202322842252.6U
Authority: CN
Inventors: 董涛; 张国雷; 黄晓江; 薛楠; 郭凯凯; 王明义; 郑夏雨
Original assignee: Luoyang Dingyang Photoelectric Technology Co ltd
Current assignee: Luoyang Dingyang Photoelectric Technology Co ltd
Priority date: 2023-10-23
Filing date: 2023-10-23
Publication date: 2024-06-07
Anticipated expiration: 2033-10-23

Abstract

The utility model provides an erbium glass solid laser ranging received signal constant ratio circuit which comprises a delay circuit, an attenuation circuit, a high-speed comparator, a threshold comparator and a logic AND gate, wherein the input ends of the delay circuit and the attenuation circuit and the positive input end of the threshold comparator are respectively connected with an input signal HB; the output end of the delay circuit is connected with the positive input end of the high-speed comparator, and the output end of the attenuation circuit is connected with the negative input end of the high-speed comparator; the negative input end of the threshold value comparator is connected with a fixed threshold voltage, the output end of the high-speed comparator and the output end of the threshold value comparator are respectively connected with two input ends of a logic AND gate, and the output end of the logic AND gate outputs a STOP signal shaped by a logic high level. The utility model effectively determines the starting and stopping of time through the amplitude time proportion point in the rising time process of the echo, reduces the error generated by the amplitude change of the signal and realizes high-precision measurement.

Description

Erbium glass solid laser ranging received signal constant ratio circuit

Technical Field

The utility model relates to the technical field of laser photoelectricity, in particular to an erbium glass solid laser ranging received signal constant ratio circuit.

Background

The working principle of the distance measurement of the erbium glass solid laser machine is as follows: the singlechip outputs a pulse control signal, controls the driving circuit to generate constant current matched with the laser machine, and drives the laser machine to output laser. The receiving module converts the optical signal diffusely reflected by the target into an electric signal, amplifies the weak electric signal through the signal processing circuit and converts the weak electric signal into a digital signal, the time judgment is carried out by using the timing chip or the programmable logic gate array, and the ranging distance value is calculated by using the light speed. The erbium glass solid laser ranging has the outstanding advantages of relatively small volume, good stability, high instantaneous power, long ranging distance and the like. The optical pulse width of the bait glass solid laser is generally less than ten nanoseconds, the initial timing moment is accurate, meanwhile, the timing precision can reach a picosecond-level high-precision timer, and the end timing is very accurate. The erbium glass solid laser ranging is generally low in frequency and mostly 1-10 Hz, and the ranging accuracy is difficult to improve through a high-frequency addition algorithm, so that the reduction of the ranging error through signal processing is particularly important.

The existing erbium glass solid laser ranging mode in the market at present uses a pulse signal output by a controller as an initial timing signal, and precision errors can be generated due to energy fluctuation of the erbium glass solid laser.

Disclosure of utility model

The utility model aims to provide an erbium glass solid laser ranging receiving signal constant ratio circuit, which effectively determines time starting and stopping through amplitude time proportion points in the rising time process of an echo, reduces errors generated by signal amplitude change and realizes high-precision measurement.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the constant ratio circuit comprises a delay circuit, an attenuation circuit, a high-speed comparator, a threshold comparator and a logic AND gate, wherein the input ends of the delay circuit and the attenuation circuit and the positive input end of the threshold comparator are respectively connected with an input signal HB; the output end of the delay circuit is connected with the positive input end of the high-speed comparator, and the output end of the attenuation circuit is connected with the negative input end of the high-speed comparator; the negative input end of the threshold value comparator is connected with a fixed threshold voltage, the output end of the high-speed comparator and the output end of the threshold value comparator are respectively connected with two input ends of a logic AND gate, and the output end of the logic AND gate outputs a STOP signal shaped by a logic high level.

Preferably, the delay circuit comprises a low-pass filter composed of resistors R1 and C2.

Preferably, the attenuation circuit comprises a resistor R5 and a resistor R8 which are sequentially connected in series.

The beneficial effects are that: the constant ratio circuit of the received signal is optimized for the processing circuit of the traditional threshold comparison circuit, timing errors are caused by fixed threshold due to fluctuation of signals, the errors cannot be reduced by multiple measurement due to frequency limitation, and the starting and stopping of time are determined by amplitude-time proportion points in the rising time process of the echo, so that errors caused by amplitude change of the signals are reduced, and high-precision measurement is realized.

Drawings

Fig. 1 is a schematic block diagram of the circuit of the present utility model.

Fig. 2 is a schematic circuit diagram of the present utility model.

Detailed Description

The utility model will be described in further detail with reference to the accompanying drawings and specific examples.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are therefore not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, which would otherwise be used by those skilled in the art, would not have the essential significance of the present disclosure, would still fall within the scope of the present disclosure without affecting the efficacy or achievement of the present disclosure.

Meanwhile, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "front," "rear," and the like refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description and simplicity of description, and do not necessarily indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Changes or modifications in the relative relationships thereof without materially altering the technical content are also considered to be within the scope of the utility model as it may be practiced.

It should be noted that, in the present application, parts not described in detail are all prior art.

As shown in fig. 1, the erbium glass solid laser ranging receiving signal constant ratio circuit comprises an input signal HB which is transmitted by a laser ranging machine, reflected by a target, converted into an electric signal by an avalanche receiver and amplified by an amplifying circuit, wherein the input signal HB is divided into three paths, and the first path is connected with a positive input end of a threshold comparator and a fixed threshold voltage connected with a negative input end of the threshold comparator for comparison; the second path is connected to the positive input end of the high-speed comparator through a delay circuit; the third path is connected to the negative input end of the high-speed comparator through the attenuation circuit; the output end of the high-speed comparator and the output end of the threshold comparator are respectively connected with two input ends of the logic AND gate, and the output end of the logic AND gate outputs a STOP signal after being shaped by a logic high level.

When the device specifically works, the laser range finder emits laser, the laser is reflected by a target and is converted into an electric signal by the avalanche receiver, the electric signal is amplified by the amplifying circuit and is divided into three paths, and fixed threshold pre-comparison is carried out between the first paths to eliminate a noise false touch method. The second path enters the non-inverting input end of the high-speed comparator through the delay device. The third path is attenuated after being carried out by the operational amplifier, and enters the inverting input end of the high-speed comparator, when the amplitude of the echo signal is changed, the moment point of state transition of the comparator is not influenced by the change of the amplitude of the echo signal, and the moment point is always kept when the echo signal reaches a certain fixed height proportion, so that the moment identification accuracy can be ensured.

As shown in fig. 2, HB is the received echo signal; r1 and C2 form a low-pass filter to delay signals; r5 and R8 carry out partial pressure attenuation on the signals; u1 is a high-speed comparator for comparing the delay signal with the attenuation signal; u3 is a high-speed comparator, the threshold value of which is determined by the partial pressure of R12 and R14, and the signals are pre-compared; u2 is a logic AND gate, namely the STOP signal is a signal which is output by U1 and U3 and is shaped by logic high level.

The constant ratio circuit of the erbium glass solid laser ranging receiving signal provided by the application is applied to the erbium glass solid laser ranging machine of my department, and the testing is carried out under various extreme conditions, so that the ranging precision is greatly improved.

While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the utility model is limited only by the specific embodiments described above.

Claims

1. The utility model provides an erbium glass solid laser range finding received signal constant ratio circuit which characterized in that: the device comprises a delay circuit, an attenuation circuit, a high-speed comparator, a threshold comparator and a logic AND gate, wherein the input ends of the delay circuit and the attenuation circuit and the positive input end of the threshold comparator are respectively connected with an input signal HB; the output end of the delay circuit is connected with the positive input end of the high-speed comparator, and the output end of the attenuation circuit is connected with the negative input end of the high-speed comparator; the negative input end of the threshold value comparator is connected with a fixed threshold voltage, the output end of the high-speed comparator and the output end of the threshold value comparator are respectively connected with two input ends of a logic AND gate, and the output end of the logic AND gate outputs a STOP signal shaped by a logic high level.

2. The erbium glass solid laser ranging receiving signal constant ratio circuit according to claim 1, wherein: the delay circuit comprises a low-pass filter formed by resistors R1 and C2.

3. The erbium glass solid laser ranging receiving signal constant ratio circuit according to claim 1, wherein: the attenuation circuit comprises a resistor R5 and a resistor R8 which are sequentially connected in series.