JPH0654291B2 - Spectrophotometer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spectrophotometer capable of performing spectroscopic measurement on various samples.

(Prior Art) FIG. 1 shows an embodiment of the present invention, which is also a general configuration of a spectrophotometer. In this figure, M is a spectroscope, and the luminous fluxes r and s of the spectroscope pass through the sample chamber C and enter the photometric section P. In the case of spectroscopic analysis of the sample solution, the sample cell and the control cell are placed on the optical paths of the light fluxes r and s in the sample chamber C, and the transmittance or the absorbance of the sample is measured by the photometric section P. The spectrophotometer is configured to be suitable for performing the above-mentioned measurements, and even solid samples can be measured for transmittance of small samples with parallel planes in the same way as solution samples, but other When performing measurement, various adapters are generally installed in the sample chamber C. Especially when using a large-diameter integrating sphere, or when measuring the transmittance or reflectance of a large or irregularly shaped sample, etc., as shown in FIG. 5, an adapter A for extracting the light emitted from the spectroscope to the outside of the sample chamber is used. A window for taking out light is provided on the side surface of the sample chamber C in the sample chamber C, and an external adapter such as the integrating sphere I or the large sample chamber L is positioned and connected to this side surface.

(Problems to be Solved by the Invention) In the above-described conventional spectrophotometer, it is necessary to replace the external adapter connected to the outside of the sample chamber as in the case where the measurement using the integrating sphere and the measurement of a large sample are alternately performed. In some cases, there was the trouble of having to change each external adapter. The present invention intends to eliminate the trouble of changing the adapter when the external adapter connected to the outside of the sample chamber of the spectrophotometer needs to be replaced.

(Means for Solving the Problem) In a spectrophotometer having a spectroscope, a sample chamber through which light emitted from the spectroscope passes, and a photometric unit into which the light passing through the sample chamber is incident, a front surface and a rear surface of the sample chamber (sample chamber In (2 opposite side walls that are not in contact with the spectroscope or the photometric section), a window for guiding the emitted light of the spectroscope is provided, respectively, and an external adapter can be detachably attached to the spectroscope in the sample chamber. An optical path switching means for reflecting the emitted light toward an external adapter on the front surface or the rear surface of the sample chamber is provided so that it can be inserted and removed.

(Function) The sample chamber is usually used for measuring solution samples or small samples, but since external adapters are detachably installed on both the front and back sides of the sample chamber, two types of external adapters can be connected to the sample chamber at the same time. The external adapter can be used as desired without having to remove and replace the external adapter one by one.

(Embodiment) FIG. 1 shows the whole embodiment of the present invention. M is a spectroscope that emits two light beams, a reference light beam r and a sample light beam s. Reference numeral C denotes a sample chamber fixed outside the spectroscope M, through which the reference light beam r and the sample light beam s pass. P is a photometric unit attached to the side surface of the sample chamber C, and two light fluxes r and s are incident thereon. The above configuration is the same as the conventional spectrophotometer. In the present invention, the front surface f and the rear surface b of the sample chamber C are respectively provided with the second
As shown in the figure, two windows W1 and W2 for extracting the reference light beam and the sample light beam, pins p1 and p2 which are positioning means of the external adapter, and screw holes T1 and T2 for fixing the external adapter are provided. The external adapters can be attached to the front and rear surfaces of the sample chamber C, respectively. In the case of using without using an external adapter, window blocking plates are attached to the front and rear surfaces of the sample chamber C by utilizing screw holes T1 and T2.

FIG. 3 shows the spectrophotometer with two types of external adapters attached. I is an integrating sphere and L is a large sample chamber. In the sample chamber C, two mirrors m1 and m2 for guiding the reference beam r and the sample beam s emitted from the spectroscope M to the large sample chamber L.
An adapter A1 equipped with is installed. q is a positioning pin for positioning the adapter A1 in the sample chamber C,
B is a screw for fixing the same adapter in the sample chamber. A2 is an adapter which is set in the sample chamber C for guiding the control light beam r and the sample light beam s to the integrating sphere I, and is replaced with A1 when the integrating sphere I is used.

In the large sample chamber L, Sl is a sample. The reference light flux is directly guided to the integrating sphere Il in the large sample chamber by the mirrors m3, m4 and m5, and the sample light beam is the sample Sl.
The optical path is guided so as to pass through and enter the integrating sphere Il. Iwo is a light emission window of the integrating sphere Il, a light receiving element Pl is placed on the lower outside of this window, a signal cable Kl is extended from Pl, and a connection plug at the tip thereof is provided in the photometric section P. The light receiving element Pl is inserted into the signal connector Cp and is connected to the photometric circuit in the photometric section P. In the integrating sphere I, S is a sample and Sr is a standard white plate. I
wo 'is a light emitting window of the integrating sphere I, and a light receiving element Pi is attached below the window, and the tip of the signal cable Ki extending from Pi is inserted into the connector Cp of the photometric section P to thereby detect the light receiving element Pi. It is connected to the photometry circuit in the photometry unit.

In the above embodiment, the adapter in the sample chamber C must be replaced with either A1 or A2 depending on whether the large sample chamber L or the integrating sphere I is used. In the embodiment of FIG. 4, the interval between the two light beams r and s emitted from the spectroscope M in the sample chamber C and the interval between the two light beams emitted when they are bent at a right angle and emitted to the external adapter are made equal. The two mirrors m1 and m2 on the adapter
Are fixed parallel to each other along one opposing side of one regular octagon, and are rotated 45 ° in the sample chamber C to guide two light beams to the front external adapter of the sample chamber or the rear external adapter. It is something that can be led to.

(Effects of the Invention) Since the present invention allows the external adapters to be attached to the front and rear sides of the sample chamber of the spectrophotometer, the two types of external adapters can be attached and detached without replacement. The measurement can be performed by using the external adapter of the spectrophotometer, and the switching operation for various uses of the spectrophotometer is greatly simplified.

[Brief description of drawings]

FIG. 1 is a plan view showing only a horizontal cross section of a sample chamber according to an embodiment of the present invention, FIG. 2 is a front view of front and rear surfaces of the sample chamber of the embodiment, and FIG. FIG. 4 is a plan view of a horizontal cross-section of an essential part with the external adapter attached, FIG. 4 is a plan view of another embodiment of the optical path switching adapter, and FIG. 5 is a plan view of a spectrophotometer with the external adapter attached in the conventional example. It is a figure. M: spectroscope, C: sample chamber, P: photometric unit, W1, W
2 ... Light flux transmission windows on front and rear surfaces of sample chamber, P1, P2 ... Positioning pins, T1, T2 ... Screw holes, I ... Integrating sphere of external adapter, L ... Large sample chamber of external adapter, Sl
...... Large sample, Si ... Sample, Il ... Integrating sphere in large sample chamber, Pl, Pi ... Light receiving element, Kl, Ki ... Signal cable, Cp ... Signal connector.

Claims (1)

[Claims] 1. A spectroscope, a sample chamber through which the light emitted from the spectroscope passes, and a photometric section into which the light passing through the sample chamber is made incident, and the light emitted from the spectroscope is led to the front surface and the rear surface of the sample chamber, respectively. In addition to providing a window to allow the external adapter to be attached detachably, the optical path switching means that guides the light emitted from the spectroscope in the sample chamber to the external adapter on the front or rear of the sample chamber can be inserted into or removed from the sample chamber. A spectrophotometer, which is provided in.