Temperature distribution measurement apparatus

• US 5,567,052 A
• Filed: 01/13/1995
• Issued: 10/22/1996
• Est. Priority Date: 08/03/1992
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Morinaka, Katsuya, Arita, Koji, Yoshiike, Nobuyuki
• Primary Examiner(s): GUTIERREZ, DIEGO F
• Application Number:
  US08/372,855
• Time in Patent Office: 648 Days
• Field of Search: 374/124, 374/130, 374/137, 374/45, 250/332, 250/334, 250/338.3
• US Class Current: 374/124
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/04 Casings
• CPC Class Codes: G01J 5/047 Mobile mounting; Scanning arrangements
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0804 Shutters
• CPC Class Codes: G01J 5/0805 Means for chopping radiation
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/34 using capacitors, e.g. pyroelectric capacitors
• CPC Class Codes: G08B 13/193 using focusing means
• CPC Class Codes: Y10S 250/01 Passive intrusion detectors

Abstract

A temperature distribution measurement apparatus has an infrared array sensor that comprises a pyroelectric substrate with infrared ray detecting electrodes, a focusing member comprising an infrared lens for focusing incident infrared rays on the infrared array sensor, a cylindrical chopping member for intermittently shielding incident infrared rays from the plurality of detector elements and a driving member for continuously rotating a rotating member which includes the infrared array sensor. The temperature distribution measurement apparatus combined with computational means and detector means is applied to determine number, position, and movements of persons in a space.

Claims

1. A temperature distribution measurement apparatus comprising:

(a) an infrared array temperature sensor, which provides temperature output signals from which a temperature distribution is measured, disposed on a rotation member,

(b) a focusing means for focusing incident infrared rays on said infrared array temperature sensor,

(c) a chopping means for intermittently shielding incident infrared rays from said infrared array temperature sensor, said chopping means rotating around said infrared array temperature sensor, and

(d) a driving means for continuously rotating said rotation member, said infrared array temperature sensor and said chopping means while synchronizing the rotation of said chopping means with said rotation member.

2. The temperature distribution measurement apparatus of claim 1 further comprising a timing means for detecting timing for chopping which is located on said chopping means or said rotation member.

3. The temperature distribution measurement apparatus of claim 2 wherein the starting time and stopping time of sampling the output signal of said infrared array temperature sensor is controlled by a signal detected by said timing means.

4. The temperature distribution measurement apparatus of claim 2 further comprising an adder means for calculating the temperature measurement by successively adding sampled output signals in predetermined periods.

5. The temperature distribution measurement apparatus of claim 1 further comprising a housing for supporting said chopping means and said rotation member, and a position detecting means for detecting the position of said rotation member, arranged on said housing and said rotation member.

6. The temperature distribution measurement apparatus of claim 1 wherein the driving means is a brushless motor.

7. The temperature distribution measurement apparatus of claim 6 wherein said brushless motor has a frequency generator pattern and a permanent magnet, and the rotation speed of said brushless motor and the condition of rotation of said rotation member and said chopping means is controlled by induced electric current caused by movement of said permanent magnet on said frequency generator pattern.

8. The temperature distribution measurement apparatus of claim 6 further comprising cables wired on a flexible substrate, one end of said cables being connected to said rotation member, another end being connected to a housing and a middle part of said cables being bent or twisted.

9. The temperature distribution measurement apparatus of claim 8 wherein said cables include a signal cable for a timing means a signal cable for a thermistor, or a signal cable for the timing means and a signal cable for the thermistor.

10. The temperature distribution measurement apparatus of claim 1 wherein said chopping means has fins for cooling said infrared array temperature sensor by its movement.

11. The temperature distribution measurement apparatus of claim 1, wherein said infrared array temperature sensor includes an infrared lens which comprises a spherical chalcogen glass lens or a spherical silicon lens.

12. The temperature distribution measurement apparatus of claim 1 wherein said focusing means is arranged in front of said infrared array temperature sensor.

13. The temperature distribution measurement apparatus of claim 1 wherein a direction of rotation of the driving means is changed by rotating the driving means backward.

15. The temperature distribution measurement apparatus of claim 1 further comprising:

(a) a measurement means for measuring the temperature distribution in space facing an audiovisual media during said media being at work; and

(b) a computational means for determining the number of persons in the space from said temperature distribution in said space and transmitting data of the number of persons to a program rating measuring system.

16. The temperature distribution measurement apparatus of claim 1, wherein the infrared array temperature sensor is a one-dimensional infrared sensor.

17. The temperature distribution measurement apparatus of claim 1, wherein the infrared array temperature sensor is driven in one direction and subsequently in the opposite direction along an axis of rotation.

18. The temperature distribution measurement apparatus of claim 1, wherein said chopping means is cylindrical.

21. The temperature distribution measurement apparatus of claim 15 wherein said chopping means has n windows and rotates θ

_c degrees, while said rotation member rotates θ

_s degrees during a chopping cycle and satisfies the equation;

space="preserve" listing-type="equation">θ

.sub.c /θ

.sub.s =integer.

14. The temperature distribution measurement apparatus of claim I further comprising:

(a) a computational means for determining number and position of persons in a space by measuring the temperature distribution in said space; and

(b) a detector means for detecting movements of persons by analyzing change in said temperature distribution of said space with respect to time.

19. A temperature distribution measurement apparatus comprising:

(a) an infrared array temperature sensor, which provides temperature signals from which a temperature distribution is measured, disposed on a rotation member,

(b) a focusing means comprising an infrared lens for focusing incident infrared rays on the infrared array temperature sensor,

(c) a cylindrical chopping means having windows on the side which are equidistant from one another for intermittently shielding incident infrared rays from said infrared array temperature sensor, said chopping means rotating around said infrared array temperature sensor,

(d) a driving means for continuously rotating said chopping means and for continuously rotating together said rotation member, said infrared array temperature sensor and said focusing means, wherein rotating of said cylindrical chopping means/a synchronized with said rotation member,

(e) a housing for supporting said cylindrical chopping means and said rotation member, and

(f) wire cables disposed on a flexible substrate, one end of said cables being connected to said rotation member, another end being connected to said housing and a middle part of said cables being bent or twisted.

20. The temperature distribution measurement apparatus of claim 19 wherein said chopping means has n windows and rotates θ

_c degrees, while said rotation member rotates θ

_s degrees during a chopping cycle and satisfies the equation;

space="preserve" listing-type="equation">θ

.sub.c =(360/n±

θ

.sub.s).

22. The temperature distribution measurement apparatus of claim 19, wherein the infrared array sensor is a one-dimensional infrared sensor.

23. A temperature distribution measurement apparatus comprising:

(a) an infrared array temperature sensor, which provides temperature signals from which a temperature distribution is measured, disposed on a rotation member;

(b) a focusing means for focusing incident infrared rays on said infrared array temperature sensor;

(c) a cylindrical chopping means having windows on the side which are equidistant from one another for intermittently shielding incident infrared rays from said infrared array temperature sensor, said chopping means rotating around said infrared array temperature sensor;

(d) a brushless motor for continuously rotating said chopping means and for continuously rotating together a rotation member, said infrared array temperature sensor and said focusing means, wherein rotating of said cylindrical chopping means is synchronized with said rotation member;

(e) a housing for supporting said chopping means and said rotation member;

(f) cables wired on a flexible substrate, one end of said cables being connected to said rotation member, another end of which being connected to said housing and a middle part of said cables being bent or twisted.

24. The temperature distribution measurement apparatus of claim 23, wherein the infrared array sensor is a one-dimensional infrared sensor.