JPH03187582A - Infrared detection device - Google Patents

Abstract

PURPOSE:To display a two-dimensional picture through simple constitution without using an optical scanner by scanning two-dimensionally a time-sequential signal from a linear array sensor and the horizontal angle information of a rotating means. CONSTITUTION:An infrared linear array sensor 11 is arranged in a vertical direction, and scanning in the vertical direction is executed by reading out time-sequentially the signals of this infrared linear array sensor 11. On the other hand, the infrared linear array sensor 11 is placed on a horizontal rotary table 17, and horizontal scanning is executed by rotating this horizontal rotary table 17 in a horizontal direction. Thus, two-dimensional information to display the horizontal scanning field of view of a wide range can be easily obtained through the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a pyroelectric infrared linear array sensor to
This invention relates to an infrared detection device that displays a two-dimensional screen.

Conventional technology Conventional infrared detection devices use a two-dimensional infrared sensor or a one-dimensional sensor, scanning in the horizontal direction using a time-sequential signal from the one-dimensional sensor and scanning in the vertical direction using a reflecting mirror. . For example, JP-A-63-65328
The configuration described in the publication is known.

The configuration will be briefly described below. FIG. 4 is a schematic diagram showing a conventional two-dimensional infrared imaging device.

In FIG. 4, 30 is a one-dimensional pyroelectric infrared detector;
1 is an optical chopper, 32 is an infrared optical lens, 33 is an optical scanner, 34 is a photointerrupter, 135 is a step sawtooth generator, 36 is an optical scanner drive amplifier, 3
7 is a visual field, and 38 is a signal processing section. Optical scanner-33
performs a step rotation in synchronization with the moment when the optical chopper 31 is switched to close, and when the optical chopper 31 is closed at a certain period, the optical scanner 33 scans in a step manner to complete one screen. To do this, a step-sawtooth-like scan is performed as a whole. Optical scanner 33, infrared optical lens 32
The infrared light from the field of view 37 is modulated by the optical chopper and enters the one-dimensional pyroelectric infrared detector 30 .

The -dimensional pyroelectric infrared detector 30 performs horizontal scanning by reading out signals time-sequentially in its one-dimensional direction.

The photointerrupter 34 detects the open/closed state of the optical chopper 31, and generates a step sawtooth wave from the step sawtooth wave generator in synchronization with the open/closed state. Based on this step sawtooth wave, a signal for stepwise rotation of the optical scanner 33 is applied from the optical scanner drive amplifier 36 to the optical scanner 33, and the optical scanner 33 is rotated in a stepwise sawtooth wave shape. This causes vertical scanning.

In this way, the one-dimensional pyroelectric infrared detector 30 is horizontally
Vertical scanning is performed, and a two-dimensional image can be displayed by signal processing the two-dimensional signal in the signal processing unit 38.

Problems to be Solved by the Invention However, the system using an optical scanner (reflection mirror) has a problem in that the optical scanner scanning mechanism system is large-scale and complicated.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an infrared detection device capable of two-dimensional scanning with a simple configuration without using an optical scanner.

Means for Solving the Problems In order to achieve the above object, the technical solution of the present invention is to mount an infrared detection section that combines a linear array sensor, an infrared optical system, and an infrared modulator on a horizontal rotary table, and Scanning in the direction is performed using time-sequential signals from the linear array sensor, and scanning in the horizontal direction is performed by rotating the horizontal movable table. Two-dimensional information is obtained using the horizontal angle information from the encoder angle reader attached to the rotating shaft. and three-dimensional display.

Operation of the present invention is carried out by arranging infrared IJ near array sensors in the vertical direction and reading out signals from the infrared linear array sensors in time sequence in the vertical direction.

On the other hand, the infrared linear array sensor is mounted on a horizontal rotating table, and horizontal scanning is performed by rotating the horizontal rotating table in the horizontal direction. Therefore, with a simple configuration, horizontal and vertical scanning is possible, and two-dimensional information can be easily obtained.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 is a conceptual diagram of an infrared detection device according to an embodiment of the present invention, Figure 2 is a signal waveform diagram of each part during horizontal scanning focusing on the signal of one element (Sl), and Figure 3 is a temperature distribution display section. This is a three-dimensional display screen. 1 is a pyroelectric linear array sensor in which a plurality of pyroelectric infrared detection elements are arranged one-dimensionally, 12 is a sensor driver with a built-in preamplifier, 13 is a photointerchanger, 14 is a chopper drive motor, and 15 is an optical chopper. , 16 is an infrared optical lens, 17 is a rotating movable table, 1
8 is a rotary drive motor, 19 is an encoder angle reader, 20 is a motor control section, 21 is an angle information signal section, 22
23 is a signal processing unit, 23 is a temperature distribution display device, 24 is a sensor field of view, 25 is an angle information signal, 26 is a chopper opening/closing signal, 27 is an infrared sensor output signal, 28 is a temperature information output, and 29 is an angle signal.

In the above configuration, the operation will be explained below. First, when the device is not moved horizontally, the sensor field of view 2
The infrared rays incident from 4 (PL) are condensed by an infrared optical lens 16 and imaged on a pyroelectric linear array sensor II.

At this time, the incident infrared rays are modulated by the optical chopper 15, and signals corresponding to the temperature distribution of the object are generated by each pyroelectric infrared detection element as +Qk and -Q in response to the optical chopper opening/closing signal 26, and after arithmetic processing, Data is updated every chopper cycle and an infrared sensor output signal 27 is output, and each signal is read out in time order and becomes a vertical scanning signal.

In this state, when the rotary movable table 17 is rotated by the rotary drive motor 18 and the entire apparatus is scanned in the horizontal direction, the field of view 24 (P
2), (P3), and (Pn) are scanned one after another, a scanning angle signal 29 is output from the encoder angle reader 19, and angle information 25 is output from the angle information generating section 21.

At that time, the data of the linear array sensor signal is updated at the chopper opening/closing cycle (Toc), and the signal processing unit 22
The temperature information 28 corresponding to the angle between the scan start signal (SS) and the scan end signal (SE) is synthesized to form a temperature distribution image signal for one screen. By displaying this in two dimensions and in three dimensions as shown in FIG. 3, it is displayed on the temperature distribution display device 23 as a temperature distribution image signal.

In the case of two-dimensional display, temperature information can be displayed as changes in brightness or color, and in the case of three-dimensional display, it can be displayed as changes in the height of mountains as shown in FIG.

In this case, if the rotating movable table 17 is rotated at a constant speed, uniform speed scanning becomes possible, and the horizontal direction of the sensor field of view 24 (L-
R direction), when displaying images at equal intervals for each scanning angle position corresponding to each of pn, pt, ...P, scales a, b,
When ... is displayed, the horizontal positional relationship of the images becomes clear.

In the above explanation, we have explained the combination of a motor and an encoder, but if the motor is replaced with a stepping motor,
Horizontal scanning angle information can also be obtained by applying a step angle pulse to the motor, and a similar effect can be obtained. In this case, the stepping motor is rotated at an equal angle for each step angle pulse. In this case as well, display scales a, b, . . . can be displayed for each rotational angular position.

The scanning direction is repeatedly displayed from right (R3) to left (LS) or from left (LS) to right (R3) as shown in Figure 3, and the total horizontal scanning angle X is set to be displayed on the screen. When the horizontal angle is larger than X, the horizontal screen may be scrolled using zero-level means.

As is clear from the above description, according to this embodiment, the pyroelectric linear array sensor 11 is arranged vertically, and the rotary movable table 17 performs horizontal scanning to obtain a two-dimensional temperature distribution image. Scanning is performed using time-sequential signals from a pyroelectric linear array sensor, and a temperature distribution image can be obtained using angle signals from an encoder angle reader 19 attached to the axis of the horizontal rotary table 17.

Effects of the Invention As described above, the present invention provides a method for obtaining a two-dimensional temperature distribution signal using a pyroelectric linear array sensor, in which a time sequential signal of a pyroelectric linear array sensor arranged vertically is used as a vertical scanning signal. Horizontal scanning is performed using an encoder angle reader attached to the axis of a horizontal rotary table or a scanning angle signal of an angle pulse signal applied to a stepping motor, so that a wide range of horizontal scanning fields can be displayed with a simple configuration. It is possible to obtain two-dimensional or three-dimensional temperature distribution images, which is highly effective.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram showing the overall configuration of an infrared detection device according to an embodiment of the present invention, Fig. 2 is a signal waveform diagram of each part during horizontal scanning focusing on the signal of one element, and Fig. 3 is a temperature distribution display. FIG. 4 is a schematic diagram showing a conventional two-dimensional infrared imaging device. 11... Pyroelectric linear array sensor, 12... Sensor driver, 13... Photo interrupter, 14...
... Chopper drive motor, 15... Optical chopper,
16... Infrared optical lens, 17... Rotating movable table, 1
8... Rotation drive motor, 19... Encoder angle reader, 20... Motor control section, 21... Temperature information generation section, 22... Signal processing unit, 23...
Temperature distribution display device, 24...sensor field of view.

Claims (5)

[Claims] (1) A linear array sensor in which a plurality of pyroelectric infrared detection elements are vertically arranged, an infrared optical system that irradiates incident infrared light to the linear array sensor, and an infrared modulator that modulates the incident infrared light. and a rotation means for horizontally rotating the rotation table, and a two-dimensional image is generated using time-sequential signals from the linear array sensor and horizontal angle information of the rotation means. An infrared detection device characterized by obtaining information. (2) The infrared detection device according to claim 1, wherein the rotation means includes an encoder angle reading section for reading the rotation angle of the drive motor and the rotary table. (3) The infrared detection device according to claim 1, wherein the rotating means is a stepping motor, and the horizontal angle information is obtained from the step angle of the stepping motor. (4) The infrared detection device according to claim 1, wherein the horizontal scanning section caused by the rotation of the turntable is divided into a plurality of sections at equal intervals, and a signal corresponding to each scanning angle is displayed on the screen. (5) The infrared detection device according to claim 1, further comprising means for scrolling the display in the horizontal direction when the horizontal angle displayed on the display screen is x, the total horizontal scanning angle is X, and x<X.