CN113009458A - Compact narrow-band background light power meter and laser detection equipment comprising same - Google Patents
Compact narrow-band background light power meter and laser detection equipment comprising same Download PDFInfo
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- CN113009458A CN113009458A CN202110242656.4A CN202110242656A CN113009458A CN 113009458 A CN113009458 A CN 113009458A CN 202110242656 A CN202110242656 A CN 202110242656A CN 113009458 A CN113009458 A CN 113009458A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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Abstract
A compact narrowband background light power meter and laser detection equipment comprising the same are provided, wherein the compact narrowband background light power meter comprises: a lens and a host; the host comprises a detector, a pre-amplifier, a filter, a post-amplifier, an analog-digital converter, a microprocessor key, a display screen and an external serial interface which are integrated in a host shell; wherein, the host computer is for dismantling the connection with the camera lens. The compact narrow-band background light power meter is suitable for detecting and calculating background light power and spectral radiance data in an industrial temperature range, and has the characteristics of small volume, high reliability, wide applicable temperature range, simple setting and low operation difficulty.
Description
Technical Field
The invention relates to the field of measurement of optical power and spectral radiance, in particular to a compact narrowband background light power meter and laser detection equipment comprising the same.
Background
Laser detection devices such as laser radars, laser range finders, laser altimeters, laser receivers and laser guide heads, which work in a single-wavelength narrow-bandwidth mode, need to calculate information such as target distance, height and position by detecting weak laser echo signals reflected by a detected target. The spectral range of operation of such laser detection devices is determined by the optical filter elements such as bandpass filters used therein, typically within tens of nanometers, e.g., 905nm for the operating wavelength and 10nm for the spectral bandwidth of an industrial laser range finder. When receiving a laser echo signal reflected by a detection target, background interference light such as atmospheric scattered light from objects around the target, sunlight, and the like can be received. The stronger the background light is, the lower the signal-to-noise ratio of the laser detection equipment is, thereby reducing core technical indexes such as detection sensitivity and the like. Therefore, the background light power and the background spectrum radiance are accurately measured, the detection capability of the laser detection equipment can be quantitatively evaluated, and the environmental system adaptability and reliability of the laser detection equipment are improved.
In order to directly and accurately evaluate the background light power received by the laser detection equipment, the prior art has no product directly related to the application, and the background light power needs to be indirectly obtained by adopting a plurality of equipment combinations and a complex secondary development mode of a user. The existing product can be realized by the following two technical schemes.
Firstly, a technical scheme based on a spectral radiance luminance meter is adopted. The system consists of a spectral irradiation brightness meter, a user computer or an embedded processing unit. The testing method is that firstly, a spectrum irradiation brightness meter is adopted to measure the background, the obtained wide-spectrum irradiation brightness data is sent to a user computer or an embedded processing unit, and then the user selects the corresponding spectrum measurement data according to the receiving optical parameters (the angle of view, the bandwidth, the diameter and the like) of the laser detection equipment to carry out secondary calculation to obtain the background light power. The disadvantages of this solution are: the current portable spectral radiance brightness meter is mainly used in a laboratory, has a narrow working temperature range and cannot meet the industrial temperature range; the scheme can obtain results only by secondary development of a user, has certain difficulty and is inconvenient to use; according to the scheme, a lens cannot be replaced, and the lens cannot be integrated into a receiving light path of the detection device, so that direct measurement cannot be achieved, and power data required by the detection device can be obtained only through integral integration and secondary calculation.
Secondly, a technical scheme mainly comprising an optical power meter is adopted. The optical power meter comprises an optical power meter (comprising a power probe and a meter head of the power meter), a lens (comprising an optical filter) designed by a user, a computer or an embedded processing unit and the like. The lens (including the optical filter) designed by the user needs to be consistent with the laser detection equipment to be detected. The testing method is that firstly, the lens and the probe of the optical power meter are completely assembled, the target background area is aligned, the power value of the optical power meter head is read, namely the background light power, and if the spectral radiance needs to be checked, a user needs to perform secondary calculation according to the optical parameters of the lens. The disadvantages are: the current portable optical power meter is mainly used in a laboratory, has a narrow working temperature range and cannot meet the industrial temperature range; the scattered components are built, the number is large, the size is large, and integration cannot be realized; the user is required to have professional optical knowledge, and the use difficulty is high.
Therefore, the main drawbacks of the prior art solutions are: indirectly obtaining the data by adopting a multi-equipment combination and a complex secondary development mode of a user; the prior art scheme has strong universality, but has no instrument equipment specially used for laser radar evaluation; in addition, the working temperature of the prior art is usually 0-40 ℃, the working temperature range is narrow, most products are in laboratory environment, and the products cannot be applied to industrial temperature environment.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a compact narrowband backlight power meter and a laser detection device comprising the same, so as to at least partially solve at least one of the above technical problems.
The invention designs a compact narrow-band background light power meter suitable for industrial-level application in order to solve the problems of background light power and background spectrum radiation brightness in quantitative evaluation of detection capability of laser radar laser detection equipment and reduce the use difficulty of users.
To achieve the above object, as one aspect of the present invention, there is provided a compact narrowband backlight power meter comprising:
a lens for receiving incident light; and
the host is used for calculating and outputting a light power value and a spectral radiance value, and incident light enters the host through the lens;
wherein the elements in the host include:
a detector for converting an incident optical signal into a current signal;
the pre-amplifier is used for converting the current signal output by the detector into a voltage signal and amplifying the voltage signal;
the filter is used for carrying out low-pass filtering on the voltage signal output by the pre-stage amplifier and eliminating high-frequency noise;
the post-stage amplifier is used for amplifying the signal output by the filter again;
the analog-digital converter is driven by the post amplifier and is used for digitally sampling an analog voltage signal output by the post amplifier; and
the microprocessor is used for acquiring a sampling value output by the analog-digital converter, calculating and outputting a measurement result;
wherein each element in the host is integrated within the host housing.
As still another aspect of the present invention, there is also provided a laser detection apparatus including:
the compact narrowband background light power meter is connected with the detected laser detection equipment on the side surface of the compact narrowband background light power meter;
the incident light sequentially passes through a receiving lens of the tested equipment, a detector of the tested equipment and a signal processing circuit of the tested equipment in the tested laser detection equipment.
Finally, as a further aspect of the present invention, there is also provided a laser detection device integrated with a backlight power meter, including:
the compact narrowband background light power meter, the light splitting element, the detection device detector and the detection device signal processing circuit are arranged;
the light splitting element is used for splitting incident light received by the lens into a first light source and a second light source;
the host is arranged on one side of the light splitting element, receives the first light source and is used for synchronously measuring the power of incident light background light in real time;
the detection device detector is arranged on the other side of the light splitting element, receives the second light source and is used for detecting the functions required by the laser detection device;
the detection device signal processing circuit is used for photoelectric signal conversion, signal processing, user interface, required function realization and the like of the laser detection device.
Based on the technical scheme, the compact narrow-band background light power meter and the laser detection equipment comprising the same have at least one of the following advantages compared with the prior art:
1. the compact narrow-band background light power meter is manufactured by adopting a device with the working temperature within the industrial-grade temperature range (-40 to 85 ℃), can operate in a low-temperature environment from minus 40 ℃ to minus 1 ℃ or a high-temperature environment from 41 ℃ to 85 ℃ so as to achieve the effect of using within the industrial-grade temperature range, and overcomes the technical defects that the working temperature range of the light power meter is narrow and the light power meter can only be used in a laboratory in the prior art;
2. the host of the compact narrow-band background light power meter integrates the probe and the meter head of a conventional power meter, replaces a responsible system built by discrete equipment, reduces the complexity and the cost, improves the system integration level, is beneficial to reducing the volume of the power meter, improves the reliability and greatly improves the research, development and test efficiency of a laser radar laser detection equipment receiver;
3. the compact narrow-band background light power meter is composed of a host and a lens, the host and the lens are convenient to disassemble and assemble, the shell is respectively provided with a reference plane and a mounting hole, the host and the lens are convenient for a user to align and quickly mount, the user can match a common laser detection device receiving optical system through a replaceable lens, and the use difficulty is reduced;
4. the invention obtains the optical parameters (bandwidth, diameter, visual angle and the like) of the user detection equipment and the adaptive calibrated standard lens model or the optical parameters thereof through the keyboard and the external serial interface, calculates the background light power or spectral radiance data received by the user detection equipment, displays the background light power or spectral radiance data on a display screen or sends the background light power or spectral radiance data to a user for direct use through the external serial interface, and can obtain the information of the power meter, the laser detection equipment to be detected and the like without optical design through simple setting, thereby reducing the background light measurement difficulty of the laser detection equipment and improving the development efficiency of the laser detection equipment.
Drawings
FIG. 1 is a schematic structural diagram of a compact narrowband backlight power meter in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a compact narrowband backlight power meter for a reception performance test of a laser detection device under test according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a compact narrowband backlight power meter as a module integrated into a laser detection device in an embodiment of the present invention.
Description of reference numerals:
1. a lens;
2. a host;
3. a laser detection device under test;
4. the laser detection device is integrated with a background light power meter;
11. a lens housing; 12. a lens group; 13. a lens filter; 111. a lens housing interface;
21. a host housing; 22. a detector; 23. a pre-amplifier; 24. a filter; 25. a post-stage amplifier; 26. an analog-to-digital converter; 27. a microprocessor; 28. pressing a key; 29. a display screen; 210. an external serial interface; 211. a host housing interface;
31. the tested device receives the lens; 32. a device under test detector; 33. a signal processing circuit of the tested device;
41. a light-splitting element; 42. a detection device detector; 43. detection device signal processing circuitry.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The laser radar laser detection equipment detects at specific wavelength, such as 532nm, 808nm, 905nm, 1064nm and the like, and is provided with a narrow-band spectral filter taking the working wavelength as the center. Such equipment is commonly used in industrial and military environments. The invention discloses a compact narrow-band background light power meter which is a product specially used for research, development, test and integration of laser detection equipment and aims to evaluate and quantitatively test the detection capability of the equipment.
The invention discloses a compact narrow-band background light power meter, comprising:
a lens 1 for receiving incident light; and
the host 2 is used for calculating and outputting a light power value and a spectral radiance value, and incident light enters the host 2 through the lens 1;
among them, the elements in the host 2 include:
a detector 22 for converting an incident optical signal into a current signal;
a preamplifier 23 for converting the current signal output from the detector 22 into a voltage signal and amplifying the voltage signal;
a filter 24 for low-pass filtering the voltage signal output from the preamplifier 23 to remove high-frequency noise;
a post-amplifier 25 for amplifying the signal output from the filter 24 again;
an analog-to-digital converter 26 driven by the post-amplifier 25 for digitally sampling an analog voltage signal output from the post-amplifier 25; and
a microprocessor 27 for obtaining the sampling value output by the analog-digital converter 26, calculating and outputting the measurement result;
wherein various elements in the host 2 are integrated within the host housing 21.
In some embodiments of the invention, the elements in the host 2 further comprise:
a key 28 for acquiring user input information and power control information;
the display screen 29 is used for realizing the state display or the measurement result display of the compact narrow-band background light power meter; and
the external serial interface 210 is used for interfacing with the user equipment, outputting measurement results or remotely controlling the user equipment.
In some embodiments of the present invention, the lens barrel 1 includes: the lens comprises a lens filter 13, a lens group 12 and a lens shell 11, wherein the lens filter 13 and the lens group 12 are sequentially arranged in the lens shell 11 according to the incident direction of incident light;
the lens housing 11 is provided with a lens housing interface 111 at one end of the lens group 12;
in some embodiments of the present invention, the host housing 21 is provided with a host housing interface 211 at an incident light entering end;
in some embodiments of the present invention, the connection of the lens housing interface 111 and the host housing interface 211 comprises a detachable connection.
In some embodiments of the present invention, the interface type of the lens housing interface 111 or the host housing interface (211) includes a C interface, a CS interface, an F interface, a V interface, a T2 interface, a laika interface, an M10 interface, an M20 interface, an M30 interface, an M42 interface, or an M50 interface;
in some embodiments of the present invention, the lens housing interface 111 is an external threaded interface and the host housing interface 211 is an internal threaded interface.
In some embodiments of the present invention, the working temperature of the lens 1 and the host 2 is-40 to 85 ℃, and may be operated in a low temperature environment of-40 ℃ to-1 ℃ or a high temperature environment of 41 ℃ to 85 ℃, for example, the working temperature may be-40 ℃, -35 ℃, -30 ℃, -25 ℃, -20 ℃, -15 ℃, -10 ℃, -5 ℃, 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃ or 80 ℃;
in some embodiments of the invention, the host 2 is calibrated for spectral responsivity at-40 to 85 deg.C,
in some embodiments of the invention, the spectral wavelength point for spectral responsivity calibration comprises 532nm, 808nm, 905nm, or 1064 nm.
In some embodiments of the present invention, the host housing 21 is provided with a reference plane and mounting holes for quick alignment and mounting of the lens 1.
The invention also discloses a laser detection device, comprising:
a compact narrowband backlight power meter as described above; and
the detected laser detection equipment 3 is connected to the side face of the compact narrowband background light power meter;
in some embodiments of the present invention, the incident light passes through the device under test receiving lens 31, the device under test detector 32 and the device under test signal processing circuit 33 in the laser detection device under test 3 in sequence.
In some embodiments of the present invention, the lens 1 of the compact narrowband backlight power meter is parallel to the device under test receiving lens 31, and the device under test 3 is installed on the host casing 21 with the reference surface and the installation hole on the host casing 21 as reference location;
in some embodiments of the present invention, the lens 1 and the device under test receiving lens 31 operate at the same wavelength.
The invention also discloses a laser detection device integrated with the background light power meter, which comprises:
the compact narrowband background light power meter, the light splitting element 41, the detection device detector 42 and the detection device signal processing circuit 43 as described above;
in some embodiments of the present invention, the light splitting element 41 is configured to split the incident light received by the lens 1 into a first light source and a second light source;
in some embodiments of the present invention, the host 2, disposed on one side of the light splitting element 41, receives the first light source for synchronous real-time measurement of incident light power;
in some embodiments of the present invention, the detection device detector 42, disposed on the other side of the light splitting element 41, receives a second light source for detection of the required function of the laser detection device;
in some embodiments of the present invention, the detection device signal processing circuit 43 is used for photoelectric signal conversion, signal processing, user interface, and implementation of required functions of the laser detection device.
In some embodiments of the present invention, the included angle between the light splitting element 41 and the detection device detector 42 includes 90 degrees;
in some embodiments of the present invention, the splitting ratio of the splitting element 41 comprises 1% to 60%.
In an embodiment of the present invention, a compact narrowband backlight power meter is disclosed, as shown in fig. 1, the compact narrowband backlight power meter is composed of two parts: a power meter main body (i.e. main body 2) and a power meter lens (i.e. lens 1). The lens 1 is composed of a lens housing 11, a lens filter 13, and a lens group 12. The host 2 is composed of a host housing 21, a detector 22, a preamplifier 23, a low-pass filter (i.e., a filter 24), a post amplifier 25, an analog-digital converter 26, a microprocessor 27, a key 28, a display screen 29, an external serial interface 210, and the like. The lens (i.e. the lens 1) of the power meter is a narrow-band optical system, for example, the working center wavelength is one of 532nm, 808nm, 905nm, 1064nm and the like, the bandwidth is 10nm, and the power meter is used for simulating the receiving optical system parameters of the laser detection equipment to be detected. The host machine 2 is composed of elements with an industrial temperature range, can operate in a low-temperature environment of-40 ℃ to-1 ℃ or a high-temperature environment of 41 ℃ to 85 ℃, realizes the function of integrating the functions of a gauge head and a probe of a conventional optical power meter and the function of calculating the increased background light power and the spectrum radiation brightness, directly provides the result required by a user, and solves the problems of secondary calculation and secondary development of the user.
In this embodiment, the working principle of the compact narrowband background light power meter is that, on the basis of the conventional optical power meter for measuring power, a lens 1 working at a specific wavelength is added, a background light signal within a limited field angle and a limited spectral bandwidth is imaged on a calibrated optical power meter detector (i.e., a detector 22), the current background light power is directly and accurately measured by the host 2 after being processed by a circuit, and then the background light power received by the detected laser detection device 3 or the data of spectral radiance at the wavelength is calculated by the selected power meter lens parameter and the ratio of the detected laser detection device 3 receiving optical system parameter input by the user.
In this embodiment, the lens 1 and the host 2 can be conveniently disassembled and assembled, wherein the installation end surface of the lens 1 is an external thread (i.e., the lens housing interface 111), and the installation end surface of the host 2 is an internal thread (i.e., the host housing interface 211). The thread size is selected from a camera C or CS interface, and can also be in a national standard size, such as M10, M20, M30 and the like. The power meter main machine (namely the main machine 2) can be divided into different products according to different interface forms, and the main machine product (namely the main machine 2) with the same interface can be adapted to a series of power meter lenses (namely the lenses 1), so that the power meter application range is improved. The series of power meter lenses described above (i.e., lens 1) includes a combination of different bandwidths, diameters, field angles, and user-customizable lens 1. The lens of the power meter (namely the lens 1) passes the test and calibration, and is provided for the user to use as a standard lens. The lens (namely the lens 1) of the power meter which can be replaced in series can be matched with a receiving optical system of common laser detection equipment, so that a user does not need to carry out optical design, the use difficulty is reduced, and a primary user can obtain required data through simple parameter input. For advanced users, the host 2 can be directly integrated into the receiving optical path of the user laser detection device without using the series power meter lens 1.
In this embodiment, all the electronic components of the host 2 are industrial and higher level devices, the host detector 22 is a photodiode, and is calibrated in terms of responsivity at multiple wavelength points in its response spectrum range and in industrial temperature range (-40 to 85 ℃). The problem that a conventional optical power meter can only be used at a laboratory temperature is solved, and the testing and integration requirements of laser detection equipment which is mainly used in industrial and military environments are met. The probe and the gauge head of the conventional power meter are integrated into a whole by the host machine 2, and although the universality of the independent gauge head is lost, the system integration level is improved, the volume of the power meter is favorably reduced, the reliability is improved, and the integration by a user is facilitated.
In this embodiment, the host 2 has a function of calculating the optical power and the spectral radiance. The implementation mode is that the optical parameters (including bandwidth, diameter, and angle of view, etc.) of the user detection device (i.e. the laser detection device 3 to be tested) and the adapted calibrated standard lens model or the optical parameters thereof are obtained through the keyboard (i.e. the keys 28) and the external serial interface 210, so as to calculate the background light power value or the spectral radiance data value received by the user detection device (i.e. the laser detection device 3 to be tested), and the background light power value or the spectral radiance data value is displayed on the display screen 29 or sent to the user through the external serial interface 210 for direct use. By integrating the function, the background light measurement difficulty of the laser detection equipment is reduced, and the development efficiency of the detection equipment is improved.
The working process of the above embodiment is that the lens 1 images the incident background light on the host detector 22, and simulates the receiving optical system of the laser detection device to be detected. The lens housing 11 mating surface (i.e., the lens housing interface 111) is an externally threaded interface. The mating face of the host housing 21 (i.e., the host housing interface 211) is an internal threaded interface. The outside side of the host housing 21 has a reference plane and is equipped with mounting holes for user mounting and quick positioning. The host 2 implements the function of a conventional optical power meter. Wherein the detector 22 converts the incident optical signal into a current signal; the preamplifier 23 converts the current signal output by the detector 22 into a voltage signal and amplifies the voltage signal; the low-pass filter (i.e. the filter 24) performs low-pass filtering on the signal output by the preamplifier 23 to remove high-frequency noise; the subsequent amplifier 25 amplifies the signal output from the low-pass filter (i.e., the filter 24) again, and drives the subsequent analog-to-digital converter 26; the analog-to-digital converter 26 implements digitized sampling of the analog signal; the microprocessor 27 obtains a light intensity sampling value output by the analog-digital converter 26, calculates a light output power value through processing such as digital signal filtering and correction, calculates background light power and spectral radiance according to user input information (including adapter lens type parameters or user equipment receiving optical parameters) obtained from the keyboard 28 or the external serial interface 210, and outputs the background light power and the spectral radiance through the display 29 or the external serial interface 210, and meanwhile, the microprocessor 27 is responsible for completing functions of working state detection, environment temperature measurement, sampling control, power saving control, interface control, display and the like of the optical power meter; the key 28 is used for obtaining user input information (adaptive lens type parameter, user equipment receiving optical parameter) and power control and other functions; the display screen 29 realizes the functions of displaying the state of the optical power meter, displaying the measurement result and the like; different interface forms CAN be selected for the external serial interface 210, such as RS232, RS485, RS422, CAN, USB, Ethernet and the like, and the interface forms are used for remote control and measurement of the user equipment.
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
Example 1:
the laser detection device with the compact narrowband background light power meter as a whole is used for evaluating the performance of the receiver of the laser detection device,
as shown in fig. 2, the compact narrowband backlight power meter of the present embodiment evaluates the laser detection device under test 3 as a whole, where the laser detection device under test 3 includes: the device under test receiving lens 31, the device under test detector 32 and the device under test signal processing circuit 33;
in this embodiment, an appropriate optical power meter lens (i.e., the lens 1) is selected according to the received optical parameters of the laser detection device 3 to be tested, and is installed on the host 2. The selected lens 1 should have the same working wavelength, similar bandwidth and similar field angle with the receiving optical lens of the device under test (i.e. the device under test receiving lens 31), which is beneficial to more accurate calculation of the host 2. For example, in order to more directly obtain the backlight data of the laser detection device under test 3, the original interface of the receiving optical lens of the laser detection device under test (i.e. the receiving lens 31 of the device under test) may be switched or modified in configuration, and directly adapted to the host enclosure interface 211 of the host 2.
In this embodiment, the background light power meter is fixedly connected to the detected laser detection device 3, and the lens 1 is parallel to the receiving optical lens of the detected laser detection device 3 (i.e. the receiving lens 31 of the detected device). The installation and positioning of the laser detection device 3 to be tested are based on the reference surface and the installation hole of the main machine shell (namely the main machine shell 21) of the optical power meter.
In this embodiment, a backlight power meter is provided, which includes a working form, a type or parameter of the adaptive lens 1, a receiving optical parameter of the detected laser detection device 3, an output data form, and the like.
Wherein, the background light power value P of the detected laser detection device 3tCan be calculated from the following equation:
spectral radiance L of the measured laser probe device 3 at the center wavelengthλCan be calculated from the following equation:
in formulae (1) and (2), PrBackground light power value, theta, measured directly for a background light power meterrFor the field angle, phi, of the adapted lens 1rFor the effective aperture, lambda, of the adapted lens 1rTo the center wavelength of the adapted lens 1; b isrThe spectral bandwidth of the adaptive lens 1; thetatFor the angle of field of view of the laser detection device 3 to be measured, phitIs the effective aperture, lambda, of the laser detection device 3 to be measuredtIs the central wavelength of the laser detection device 3 to be measured, BtFor the spectral bandwidth of the laser detection device 3 under test, where λr＝λt＝λ；
In this embodiment, after the background light power meter starts to measure, the measurement result data selected by the user will be continuously transmitted or displayed.
Example 2:
a compact narrow-band background light power meter is integrated into the laser detection device as a module,
as shown in fig. 3, in the present embodiment, a compact narrowband background light power meter is integrated in a laser detection device, and a laser detection device 4 integrated with a background light power meter is formed, including: the main unit of the background light power meter (namely, the main unit 2), the lens 1, the spectroscope (namely, the light splitting element 41), the detection device detector 42 and the detection device signal processing circuit 43.
In this embodiment, a spectroscope (i.e., a light splitting element 41) is added to the design of the receiving light path of the user laser detection device (i.e., the laser detection device 4 integrated with the background light power meter), and the light splitting ratio of the spectroscope (i.e., the light splitting element 41) is designed by the user, so that the background light power measurement range required by the user is satisfied.
In this embodiment, the host 2 of the background light power meter is installed in the user laser detection device (i.e. the laser detection device 4 integrated with the background light power meter) according to a designed optical path. The mounting positioning is based on the reference surface and the mounting hole of the optical power meter main body shell 21.
In this embodiment, a background light power meter is provided, which includes a to-be-operated mode, a mode of receiving optical parameters and outputting data by the laser detection device to be detected, and the like.
In this embodiment, after the backlight power meter starts to measure, the parameter data selected by the user will be continuously transmitted or displayed.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A compact narrowband backlight power meter, comprising:
a lens (1) for receiving incident light; and
the host (2) is used for calculating and outputting a light power value and a spectral radiance value, and incident light enters the host (2) through the lens (1);
wherein the elements in the host (2) include:
a detector (22) for converting an incident optical signal into a current signal;
a pre-amplifier (23) for converting the current signal output by the detector (22) into a voltage signal and amplifying the voltage signal;
a filter (24) for low-pass filtering the voltage signal output by the preamplifier (23) and eliminating high-frequency noise;
a post-amplifier (25) for amplifying the signal output from the filter (24) again;
an analog-digital converter (26) driven by the post-amplifier (25) and used for digitally sampling the analog voltage signal output by the post-amplifier (25); and
the microprocessor (27) is used for acquiring the sampling value output by the analog-digital converter (26), calculating and outputting a measurement result;
wherein each element in the host (2) is integrated in the host housing (21).
2. The compact narrowband backlight power meter of claim 1,
the elements in the host (2) further comprise:
a key (28) for acquiring user input information and power control information;
the display screen (29) is used for realizing the state display or the measurement result display of the compact narrow-band background light power meter; and
and the external serial interface (210) is used for butting the user equipment, outputting the measurement result or remotely controlling the user equipment.
3. The compact narrowband backlight power meter of claim 1,
the lens barrel (1) includes: the lens comprises a lens filter (13), a lens group (12) and a lens shell (11), wherein the lens filter (13) and the lens group (12) are sequentially arranged in the lens shell (11) according to the incident direction of incident light;
wherein, the lens shell (11) is provided with a lens shell interface (111) at one end of the lens group (12);
the host shell (21) is provided with a host shell interface (211) at one end where incident light enters;
the connection mode of the lens shell interface (111) and the host shell interface (211) comprises detachable connection.
4. The compact narrowband backlight power meter of claim 3,
the interface type of the lens housing interface (111) or the host housing interface (211) includes a C interface, a CS interface, an F interface, a V interface, a T2 interface, a laika interface, an M10 interface, an M20 interface, an M30 interface, an M42 interface, or an M50 interface;
the lens shell interface (111) is an external thread interface, and the host shell interface (211) is an internal thread interface.
5. The compact narrowband backlight power meter of claim 1,
the working temperature of the lens (1) and the host (2) is-40 to 85 ℃;
carrying out spectral responsivity calibration on the host (2) at-40 to 85 ℃;
the spectral wavelength points calibrated by the spectral responsivity comprise 532nm, 808nm, 905nm or 1064 nm.
6. The compact narrowband backlight power meter of claim 1,
the host housing (21) is provided with a reference plane and mounting holes for quickly aligning and mounting the lens (1).
7. A laser detection apparatus, comprising:
the compact narrowband backlight power meter of any of claims 1 to 6; and
the detected laser detection device (3) is connected to the side face of the compact narrowband background light power meter;
the incident light sequentially passes through a tested device receiving lens (31), a tested device detector (32) and a tested device signal processing circuit (33) in the tested laser detection device (3).
8. Laser detection device according to claim 7,
the lens (1) of the compact narrowband background light power meter is parallel to the receiving lens (31) of the tested device, and the tested laser detection device (3) is positioned and installed on the host shell (21) by taking the reference surface and the installation hole on the host shell (21) as references;
the working wavelength of the lens (1) is the same as that of the receiving lens (31) of the tested device.
9. A background light power meter integrated laser detection device, comprising:
the compact narrowband backlight power meter of any of claims 1 to 6, the light splitting element (41), the detection device detector (42) and the detection device signal processing circuitry (43);
the light splitting element (41) is used for splitting incident light received by the lens (1) into a first light source and a second light source;
the host (2) is arranged on one side of the light splitting element (41), receives the first light source and is used for synchronous real-time measurement of incident light power;
the detection device detector (42) is arranged on the other side of the light splitting element (41), receives the second light source and is used for detecting the required functions of the laser detection device;
the detection device signal processing circuit (43) is used for photoelectric signal conversion, signal processing, user interface and realization of required functions of the laser detection device.
10. Laser detection device according to claim 9,
the included angle between the light splitting element (41) and the detection device detector (42) comprises 90 degrees;
the light splitting ratio of the light splitting element (41) is 1% to 60%.
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