A kind of night vision test set
Technical field
This utility model relates to electronic technology field, particularly a kind of night vision test set.
Background technology
Night vision is meant that human eye enters into the ability that dark surrounds recovers to distinguish object gradually suddenly under bright light environments, i.e. the process capability that changes from weak to strong of vision.In general, the people needed to adapt to basically in 3~6 minutes, can adapt to fully after 10~13 minutes.Detection meaning to this project in the driving adaptability testing is mainly reflected in: at high-speed running automobile on light and shade road jumpy; Because vision can not adapt to immediately and be easy to produce the driving behavior that jeopardizes traffic safety, and then causes the generation of security incident; Especially driving at night or when coming in and going out the tunnel bridges and culverts, accident rate be apparently higher than daytime, and main cause is exactly that the transport information that obtains of noctovision can drop sharply to about 50% of information on daytime.
The ultimate principle that night vision detects is to let earlier examined driver's abundant light adaptation (being not less than 30sec) under bright illumination condition; And then (watch a vision value that receives the low-light illumination under the environment of briliancy 0.05~0.50Lx) attentively and be 0.2 C shape sighting target complete black; Confirm the direction of C shape sighting target opening; The simultaneous computer record is examined the driver and can be seen clearly the C shape sighting target opening direction needed time of moment fully; Being moment of occurring of C shape sighting target knows identification and confirms time of opening direction to the driver, is the metric of night vision.C shape sighting target intensity of illumination should be adjusted to suitable numerical value, to guarantee to be examined effective identification of driver.
At present, existing night vision test set, complex structure, function singleness.
The utility model content
The purpose of this utility model is for the simplified apparatus complexity, improves and detects the night vision precision, realizes the product miniaturization simultaneously, and the spy provides a kind of night vision test set.
This utility model provides a kind of night vision test set, it is characterized in that: described night vision test set comprises body 1, simulated screen and darkroom device 2; Illuminator 3; Lighting circuit control circuit board 4, motherboard 5, switch 6 are installed on body 1 exterior front panel;
Wherein: simulated screen and darkroom device 2 are installed in the side of body 1; Illuminator 3 is installed in the position of the corresponding observer's eyes in inside of body 1; Lighting circuit control circuit board 4 and motherboard 5 are installed in the inside of body 1; Illuminator 3 is connected with lighting circuit control circuit board 4 through lead, and motherboard 5 is connected with lighting circuit control circuit board 4 through lead.
Described illuminator 3 is a led light source.
Night vision comprises light adaptation and two processes of dark adaptation, and wherein its procedure of adaptation of light adaptation (when getting into bright light environments by dark state) is about about 1 minute.Adaptive time when getting into dark surrounds by bright state is relatively long, needs about 30 minutes, could arrive the best vision under the dark surrounds.Therefore, at present the detection method of night vision is mainly tended to test the height of dark adaptation ability, i.e. night vision, the key instrument of employing is the night vision detector.
Being examined the time that the driver correctly judges C shape sighting target opening direction in the simulated screen is the night vision value 1 time.
The advantage of this utility model:
The described night vision test set of this utility model, theory structure is simple, and the test accuracy rate is high, can be combined into comprehensive detecting instrument with other checkout equipment, has wide range of applications.
Description of drawings
Below in conjunction with accompanying drawing and embodiment this utility model is done further detailed explanation:
Fig. 1 is a night vision test set external structure sketch map;
Fig. 2 is the inner main functional modules sketch map of night vision test set.
The specific embodiment
Embodiment 1
Present embodiment provides a kind of night vision test set, it is characterized in that: described night vision test set comprises body 1, simulated screen and darkroom device 2; Illuminator 3; Lighting circuit control circuit board 4, motherboard 5, switch 6 are installed on body 1 exterior front panel;
Wherein: simulated screen and darkroom device 2 are installed in the side of body 1; Illuminator 3 is installed in the position of the corresponding observer's eyes in inside of body 1; Lighting circuit control circuit board 4 and motherboard 5 are installed in the inside of body 1; Illuminator 3 is connected with lighting circuit control circuit board 4 through lead, and motherboard 5 is connected with lighting circuit control circuit board 4 through lead.
Described illuminator 3 is a led light source.
Night vision comprises light adaptation and two processes of dark adaptation, and wherein its procedure of adaptation of light adaptation (when getting into bright light environments by dark state) is about about 1 minute.Adaptive time when getting into dark surrounds by bright state is relatively long, needs about 30 minutes, could arrive the best vision under the dark surrounds.Therefore, at present the detection method of night vision is mainly tended to test the height of dark adaptation ability, i.e. night vision, the key instrument of employing is the night vision detector.
Being examined the time that the driver correctly judges C shape sighting target opening direction in the simulated screen is the night vision value 1 time.