CN215769022U

CN215769022U - High-sensitivity laser range finder

Info

Publication number: CN215769022U
Application number: CN202122230135.5U
Authority: CN
Inventors: 张文金
Original assignee: Jiangsu Jinlai Photoelectric Technology Co ltd
Current assignee: Jiangsu Jinlai Photoelectric Technology Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-02-08
Anticipated expiration: 2031-09-15

Abstract

The utility model discloses a high-sensitivity laser range finder, which is a phase laser range finder and comprises a first laser source for generating laser signals and an APD (avalanche photo diode) module for receiving the laser signals, wherein a focusing lens is arranged in front of the first laser source, a receiving lens and a color filter are arranged in front of the APD module, and the measuring laser wavelength of the first laser source is 800 +/-50 nm. The laser range finder adopts a near-infrared light source as a laser source and adopts a high-sensitivity APD module as a photosensitive element, so that the laser range finder has higher measuring capability and measuring precision.

Description

High-sensitivity laser range finder

Technical Field

The utility model relates to the technical field of laser ranging, in particular to a high-sensitivity laser range finder.

Background

The laser range finder is a common instrument in the fields of engineering construction, indoor decoration, measurement and mapping. The working principle of the laser range finder is as follows: the distance measurement of the target is realized by utilizing a certain parameter of the modulated laser, and the measurement range is 3.5-5000 meters. According to the ranging method, laser rangefinders are classified into phase rangefinders and pulse rangefinders. The phase distance meter uses laser beam to modulate amplitude and measure the phase delay generated by the modulated light to and from the measuring line once, and then converts the distance represented by the phase delay according to the wavelength of the modulated light. The phase-based distance measurement is usually applied to precision distance measurement because the precision is high, generally in the millimeter level. The pulse laser distance meter emits a pulse laser beam or a series of short pulse laser beams to a target when in work, the laser beam reflected by the target is received by the photoelectric element, the time from the emission to the reception of the laser beam is measured by the timer, and the distance from the distance meter to the target is calculated. When the power of the emitted laser beam is enough, the measuring range can reach about 40 kilometers or even more, so that the pulse type distance measuring instrument is mostly applied to long-distance measurement measuring tens of hundreds of meters to kilometers.

For outdoor measurement environment, the phase distance meter has the problems of limited measuring range and larger influence of illumination on the adopted red light or green light source, so that the existing pulse distance meter is usually adopted for outdoor measurement, however, the existing pulse distance meter adopts infrared light which belongs to invisible light of human eyes, is inconvenient to observe during measurement and has unsatisfactory measurement accuracy.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides the high-sensitivity laser range finder, the photosensitive element of the high-sensitivity laser range finder has higher sensitivity, the measuring capability and the measuring precision can be effectively improved, and the high-sensitivity laser range finder is particularly suitable for outdoor measurement.

In order to achieve the above object, the high-sensitivity laser range finder of the present invention is a phase type laser range finder, comprising: the APD module is used for receiving the laser signal, a focusing lens is arranged in front of the first laser source, a receiving lens and a color filter are arranged in front of the APD module, and the measuring laser wavelength of the first laser source is 800 +/-50 nm.

Further, the first laser source employs a near-infrared light source.

Further, laser range finder still includes the second laser source as the instruction light source, and it sets up side by side with first laser source, and the wavelength of second laser source is 500 ~ 550nm or 620 ~ 690 nm.

Further, the focusing lens is an integral lens module, which comprises a first lens and a second lens, and the first lens and the second lens are respectively matched with the first laser source and the second laser source for use.

Further, the integrated lens module is arranged in front of the first laser source and the second laser source, and the first lens and the second lens are in one-to-one correspondence with the positions of the first laser source and the second laser source respectively.

Furthermore, the installation routes where the receiving lens, the color filter and the APD module are located are parallel to the installation routes where the integrated lens module, the first laser source and the second laser source are located.

Has the advantages that:

(1) the laser range finder adopts near infrared light as a measuring light source, and the measuring laser wavelength of the measuring light source is 800 +/-50 nm, so that the signal-to-noise ratio of a measuring signal is improved, and the measuring capability and the measuring precision of the laser range finder are improved;

(2) the laser range finder adopts two laser sources as a measuring light source and an indicating light source respectively, so that a measuring target can be observed conveniently during outdoor measurement with bright light;

(3) the two laser sources adopted by the laser range finder are arranged side by side, and the integrated lens module is matched, so that the parallelism of the two laser beams generated by the two laser sources is ensured, the measurement error caused by the larger interval between the lens and the laser sources is avoided, the problem of mutual interference between the lasers is also improved, and the measurement precision of the laser range finder is further improved.

Drawings

The present invention will be further described and illustrated with reference to the following drawings.

Fig. 1 is a schematic diagram of a high sensitivity laser rangefinder in accordance with a preferred embodiment of the present invention.

FIG. 2 is a graph of APD module sensitivity versus wavelength for a laser rangefinder.

Fig. 3 is a graph of solar spectral irradiance versus wavelength.

Fig. 4 is a schematic view of a high-sensitivity distance meter according to a second embodiment of the present invention.

The labels in the figure are:

2. APD module, 3, focusing lens, 4, receiving lens, 5, color filter, 10, laser ranging module, 11, first laser source, 12, second laser source, 3 ', integral lens module, 31 ', first lens, 32 ', second lens.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

The utility model discloses a high-sensitivity laser range finder which is a phase type laser range finder and comprises a first laser source for generating laser signals and an APD module for receiving the laser signals, wherein the measuring laser wavelength of the first laser source is 800 +/-50 nm.

Example 1

In the preferred embodiment shown in fig. 1, the high sensitivity laser rangefinder comprises a first laser source 11 for generating a laser signal and an APD module 2 for receiving the laser signal, wherein the first laser source has a measurement laser wavelength of 800 ± 50 nm.

The laser range finder further comprises a focusing lens 3, a receiving lens 4, and a color filter 5. The focusing lens 3 is disposed in front of the first laser light source 11. A receiving lens 4 and a color filter 5 are disposed in front of the APD module 2 in this order. These components are disposed within a laser ranging module 10.

As shown in the graph of sensitivity-wavelength of the APD module shown in fig. 2, it can be obtained that the wavelength region to which the APD module is most sensitive is about 800nm, and when the wavelength of the laser to be measured adopts the 800nm band, the sensitivity of the APD module is 45. In the photosensitive element commonly used in the market at present, when the laser wavelength is 510nm, the sensitivity is 16, and when the laser wavelength is 635nm, the sensitivity is 30, so that, compared with the prior art, when the first laser source 11 adopts the wavelength range of 800 ± 50nm, especially 800nm, the efficiency can be improved by about 50%.

The graph of solar spectral irradiance versus wavelength shown in fig. 3, in combination with the data in table 1 below, can result in a spectral irradiance of 1586.5 for the 510nm band, 1419.9 for the 650nm band, and 1081.6 for the 800nm band, which is only two-thirds of the red and green band irradiance commonly used in the market today.

According to the analysis of the APD sensitivity and the spectral irradiance, the utility model adopts a laser light source as a laser light source for phase ranging, the light source adopts near infrared light, and the wavelength range is selected to be 800 +/-50 nm, so that the sensitivity of an APD module as a photosensitive device can reach about 45.

TABLE 1

For indoor ranging, the laser range finder of the preferred embodiment has the advantages that as the sensitivity of the photosensitive device is improved, small signals can be captured more conveniently, and the measuring distance and the measuring precision of the range finder are improved; for outdoor distance measurement, the sensitivity of the photosensitive device is improved, and meanwhile, a relatively weak sunlight spectrum is selected as a measurement wavelength, so that the signal-to-noise ratio of a measurement signal is obviously improved, and the outdoor measurement capability is also improved.

Example 2

As shown in fig. 4, in this embodiment, the high-sensitivity laser range finder includes a first laser light source 11 as a measurement light source, and a second laser light source 12 as an indication light source, the second laser light source 12 being disposed side by side with the first laser light source 11.

Preferably, the first laser source 11 uses near infrared light, and the second laser source 12 uses a green light source, and the wavelength thereof can be selected from 500 to 550nm or 620 to 690 nm.

The laser rangefinder further comprises an integral lens module 3 ' comprising a first lens 31 ' and a second lens 32 ' for use with the first laser source 11, the second laser source 12, respectively. Specifically, the integrated lens module 3 ' is disposed in front of the first laser source 11 and the second laser source 12, and the first lens 31 ' and the second lens 32 ' are respectively in one-to-one correspondence with positions of the first laser source 11 and the second laser source 12, so that light emitted by the first laser source 11 and the second laser source 12 respectively passes through the first lens 31 ' and the second lens 32 ' to generate two parallel light beams.

In the present embodiment, the first laser light source 11 and the second laser light source 12 have independent adjustment mechanisms, respectively, and can perform forward and backward movement and focusing. The first lens 31 'and the second lens 32' respectively focus the light emitted by the first laser source 11 and the light emitted by the second laser source 12, so that the parallelism is ensured, the measurement error caused by the large interval between the lenses and the laser sources is avoided, and the problem of mutual interference between the lasers is also solved.

The installation routes of the receiving lens 4, the color filter 5 and the APD module 2 are parallel to the installation routes of the integrated lens module 3, the first laser source 11 and the second laser source 12 which are arranged side by side, and the first lens 31 'and the second lens 32' are of an integrated structure, so that the installation and subsequent adjustment are more convenient, and the installation accuracy and the measurement accuracy can be better guaranteed.

In this embodiment, the color filter 5 adopts band-pass filtering to allow the wavelength of the measurement light source to pass through, and to cut off the wavelength of the indication light source, thereby further improving the signal-to-noise ratio and the measurement accuracy.

The above detailed description merely describes preferred embodiments of the present invention and does not limit the scope of the utility model. Without departing from the spirit and scope of the present invention, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents. The scope of the utility model is defined by the claims.

Claims

1. The utility model provides a high sensitivity laser range finder, laser range finder is phase type laser range finder, and it includes: the device comprises a first laser source (11) used for generating laser signals and an APD module (2) used for receiving the laser signals, wherein a focusing lens (3) is arranged in front of the first laser source (11), a receiving lens (4) and a color filter (5) are arranged in front of the APD module (2), and the device is characterized in that the measuring laser wavelength of the first laser source (11) is 800 +/-50 nm.

2. The high-sensitivity laser range finder according to claim 1, wherein the first laser source (11) employs a near-infrared light source.

3. The high-sensitivity laser range finder according to claim 2, characterized in that it further comprises a second laser source (12) as an indication light source, arranged side by side with the first laser source (11), the second laser source (12) having a wavelength of 500-550 nm or 620-690 nm.

4. The high-sensitivity laser range finder according to claim 3, characterized in that the focusing lens (3) is a one-piece lens module (3 ') comprising a first lens (31 ') and a second lens (32 ') for use with the first laser source (11) and the second laser source (12), respectively.

5. The high-sensitivity laser range finder according to claim 4, wherein the integral lens module (3 ') is disposed in front of the first and second laser sources (11, 12), and the first and second lenses (31 ', 32 ') are in one-to-one correspondence with the positions of the first and second laser sources (11, 12), respectively.

6. The high-sensitivity laser distance meter according to claim 5, wherein the receiving lens (4), the color filter (5) and the APD module (2) are arranged in a mounting route parallel to the integrated lens module (3'), the first laser source (11) and the second laser source (12) arranged side by side.